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linux: rtw88: Three locking fixes for existing code
fixes: [ 38.800687] ------------[ cut here ]------------ [ 38.800703] Voluntary context switch within RCU read-side critical section! [ 38.800715] WARNING: CPU: 3 PID: 49 at kernel/rcu/tree_plugin.h:318 rcu_note_context_switch+0x314/0x3ec [ 38.800740] Modules linked in: bnep rtw88_8822cs hci_uart rtw88_8822c btqca rtw88_sdio rtw88_core btrtl btbcm btintel crct10dif_ce mac80211 sunxi_cir bluetooth ecdh_generic libarc4 dwmac_sun8i ecc hantro_vpu v4l2_vp9 v4l2_h264 panfrost drm_shmem_helper gpu_sched sun50i_di cfg80211 rfkill pkcs8_key_parser fuse [ 38.800814] CPU: 3 PID: 49 Comm: kworker/u8:1 Not tainted 6.1.1 #1 [ 38.800821] Hardware name: Tanix TX6 (DT) [ 38.800826] Workqueue: phy0 ieee80211_iface_work [mac80211] [ 38.800944] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 38.800950] pc : rcu_note_context_switch+0x314/0x3ec [ 38.800959] lr : rcu_note_context_switch+0x314/0x3ec [ 38.800965] sp : ffff8000098d3450 [ 38.800968] x29: ffff8000098d3450 x28: ffff800000d71e90 x27: ffff00000f647400 [ 38.800977] x26: 0000000000000000 x25: ffff8000098d36a8 x24: 0000000000000000 [ 38.800986] x23: 0000000000000000 x22: ffff00000201d100 x21: ffff0000bf9ab100 [ 38.800995] x20: ffff800009251e40 x19: ffff0000bf9abe40 x18: fffffffffffe7b30 [ 38.801004] x17: 7a9deabfef448dbe x16: 0000000000004664 x15: fffffffffffe7b78 [ 38.801013] x14: ffff800009400d38 x13: ffff800009400d90 x12: 0000000000000579 [ 38.801022] x11: 00000000000001d3 x10: ffff80000945b958 x9 : ffff800009400d90 [ 38.801031] x8 : 00000000ffffefff x7 : ffff800009458d90 x6 : 00000000000001d3 [ 38.801039] x5 : ffff0000bf9a48a8 x4 : 0000000000000000 x3 : 0000000000000027 [ 38.801048] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00000201d100 [ 38.801057] Call trace: [ 38.801060] rcu_note_context_switch+0x314/0x3ec [ 38.801068] __schedule+0xa4/0x6b0 [ 38.801075] schedule+0x58/0xc0 [ 38.801081] schedule_timeout+0xb8/0xec [ 38.801088] wait_for_completion+0xb0/0x150 [ 38.801093] mmc_wait_for_req_done+0x68/0x9c [ 38.801103] mmc_wait_for_req+0xa8/0xf4 [ 38.801109] mmc_wait_for_cmd+0x60/0x9c [ 38.801116] mmc_io_rw_direct+0x98/0x12c [ 38.801124] sdio_writeb+0x30/0x60 [ 38.801131] rtw_sdio_write8+0x7c/0x120 [rtw88_sdio] [ 38.801144] rtw_bf_init_bfer_entry_mu+0x3c/0xc0 [rtw88_core] [ 38.801183] rtw_bf_enable_bfee_mu+0x78/0x12c [rtw88_core] [ 38.801213] rtw8822c_bf_config_bfee+0x44/0x10c [rtw88_8822c] [ 38.801229] rtw_bf_assoc+0xec/0x210 [rtw88_core] [ 38.801258] rtw_ops_bss_info_changed+0x27c/0x280 [rtw88_core] [ 38.801287] ieee80211_bss_info_change_notify+0x100/0x184 [mac80211] [ 38.801363] ieee80211_rx_mgmt_assoc_resp+0x16f4/0x1794 [mac80211] [ 38.801438] ieee80211_sta_rx_queued_mgmt+0x250/0x9b0 [mac80211] [ 38.801513] ieee80211_iface_work+0x2b4/0x3d0 [mac80211] [ 38.801589] process_one_work+0x1cc/0x324 [ 38.801597] worker_thread+0x68/0x41c [ 38.801603] kthread+0x104/0x110 [ 38.801610] ret_from_fork+0x10/0x20 [ 38.801617] ---[ end trace 0000000000000000 ]---
This commit is contained in:
Rudi Heitbaum
parent
98507deb96
commit
844dc43e86
@ -0,0 +1,303 @@
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From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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To: linux-wireless@vger.kernel.org
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Cc: tony0620emma@gmail.com, kvalo@kernel.org, pkshih@realtek.com,
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s.hauer@pengutronix.de, netdev@vger.kernel.org,
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linux-kernel@vger.kernel.org,
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Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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Subject: [PATCH v3 0/3] wifi: rtw88: Three locking fixes for existing code
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Date: Sun, 8 Jan 2023 22:13:21 +0100
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Message-Id: <20230108211324.442823-1-martin.blumenstingl@googlemail.com>
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X-Mailer: git-send-email 2.39.0
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Precedence: bulk
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List-ID: <linux-wireless.vger.kernel.org>
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X-Mailing-List: linux-wireless@vger.kernel.org
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This series consists of three patches which are fixing existing
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behavior (meaning: it either affects PCIe or USB or both) in the rtw88
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driver.
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We previously had discussed patches for these locking issues while
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working on SDIO support, but the problem never ocurred while testing
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USB cards. It turns out that these are still needed and I think that
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they also fix the same problems for USB users (it's not clear how often
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it happens there though) - and possibly even PCIe card users.
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The issue fixed by the second and third patches have been spotted by a
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user who tested rtw88 SDIO support. Everything is working fine for him
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but there are warnings [1] and [2] in the kernel log stating "Voluntary
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context switch within RCU read-side critical section!".
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The solution in the third and fourth patch was actually suggested by
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Ping-Ke in [3]. Thanks again!
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These fixes are indepdent of my other series adding SDIO support to the
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rtw88 driver, meaning they can be added to the wireless driver tree on
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top of Linux 6.2-rc1 or linux-next.
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Changes since v1 at [4]:
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- Keep the u8 bitfields in patch 1 but split the res2 field into res2_1
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and res2_2 as suggested by Ping-Ke
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- Added Ping-Ke's reviewed-by to patches 2-4 - thank you!
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- Added a paragraph in the cover-letter to avoid confusion whether
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these patches depend on the rtw88 SDIO support series
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Changes since v2 at [5]:
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- Added Ping-Ke's Reviewed-by and Sascha's Tested-by (thanks to both of
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you!)
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- Dropped patch 1/4 "rtw88: Add packed attribute to the eFuse structs"
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This requires more discussion. I'll send a separate patch for this.
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- Updated cover letter title so it's clear that this is independent of
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SDIO support code
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[0] https://lore.kernel.org/linux-wireless/695c976e02ed44a2b2345a3ceb226fc4@realtek.com/
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[1] https://github.com/LibreELEC/LibreELEC.tv/pull/7301#issuecomment-1366421445
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[2] https://github.com/LibreELEC/LibreELEC.tv/pull/7301#issuecomment-1366610249
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[3] https://lore.kernel.org/lkml/e0aa1ba4336ab130712e1fcb425e6fd0adca4145.camel@realtek.com/
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[4] https://lore.kernel.org/linux-wireless/20221228133547.633797-1-martin.blumenstingl@googlemail.com/
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[5] https://lore.kernel.org/linux-wireless/20221229124845.1155429-1-martin.blumenstingl@googlemail.com/
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Martin Blumenstingl (3):
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wifi: rtw88: Move register access from rtw_bf_assoc() outside the RCU
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wifi: rtw88: Use rtw_iterate_vifs() for rtw_vif_watch_dog_iter()
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wifi: rtw88: Use non-atomic sta iterator in rtw_ra_mask_info_update()
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drivers/net/wireless/realtek/rtw88/bf.c | 13 +++++++------
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drivers/net/wireless/realtek/rtw88/mac80211.c | 4 +++-
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drivers/net/wireless/realtek/rtw88/main.c | 6 ++++--
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3 files changed, 14 insertions(+), 9 deletions(-)
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--
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2.39.0
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From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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To: linux-wireless@vger.kernel.org
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Cc: tony0620emma@gmail.com, kvalo@kernel.org, pkshih@realtek.com,
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s.hauer@pengutronix.de, netdev@vger.kernel.org,
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linux-kernel@vger.kernel.org,
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Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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Subject: [PATCH v3 1/3] wifi: rtw88: Move register access from rtw_bf_assoc() outside the RCU
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Date: Sun, 8 Jan 2023 22:13:22 +0100
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Message-Id: <20230108211324.442823-2-martin.blumenstingl@googlemail.com>
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X-Mailer: git-send-email 2.39.0
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In-Reply-To: <20230108211324.442823-1-martin.blumenstingl@googlemail.com>
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References: <20230108211324.442823-1-martin.blumenstingl@googlemail.com>
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MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit
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Precedence: bulk
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List-ID: <linux-wireless.vger.kernel.org>
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X-Mailing-List: linux-wireless@vger.kernel.org
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USB and (upcoming) SDIO support may sleep in the read/write handlers.
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Shrink the RCU critical section so it only cover the call to
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ieee80211_find_sta() and finding the ic_vht_cap/vht_cap based on the
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found station. This moves the chip's BFEE configuration outside the
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rcu_read_lock section and thus prevent "scheduling while atomic" or
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"Voluntary context switch within RCU read-side critical section!"
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warnings when accessing the registers using an SDIO card (which is
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where this issue has been spotted in the real world - but it also
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affects USB cards).
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Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
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Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
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Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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---
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v1 -> v2:
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- Added Ping-Ke's Reviewed-by (thank you!)
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v2 -> v3:
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- Added Sascha's Tested-by (thank you!)
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- added "wifi" prefix to the subject and reworded the title accordingly
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drivers/net/wireless/realtek/rtw88/bf.c | 13 +++++++------
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1 file changed, 7 insertions(+), 6 deletions(-)
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diff --git a/drivers/net/wireless/realtek/rtw88/bf.c b/drivers/net/wireless/realtek/rtw88/bf.c
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index 038a30b170ef..c827c4a2814b 100644
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--- a/drivers/net/wireless/realtek/rtw88/bf.c
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+++ b/drivers/net/wireless/realtek/rtw88/bf.c
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@@ -49,19 +49,23 @@ void rtw_bf_assoc(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
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sta = ieee80211_find_sta(vif, bssid);
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if (!sta) {
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+ rcu_read_unlock();
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+
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rtw_warn(rtwdev, "failed to find station entry for bss %pM\n",
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bssid);
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- goto out_unlock;
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+ return;
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}
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ic_vht_cap = &hw->wiphy->bands[NL80211_BAND_5GHZ]->vht_cap;
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vht_cap = &sta->deflink.vht_cap;
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+ rcu_read_unlock();
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+
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if ((ic_vht_cap->cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) &&
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(vht_cap->cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)) {
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if (bfinfo->bfer_mu_cnt >= chip->bfer_mu_max_num) {
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rtw_dbg(rtwdev, RTW_DBG_BF, "mu bfer number over limit\n");
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- goto out_unlock;
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+ return;
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}
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ether_addr_copy(bfee->mac_addr, bssid);
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@@ -75,7 +79,7 @@ void rtw_bf_assoc(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
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(vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)) {
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if (bfinfo->bfer_su_cnt >= chip->bfer_su_max_num) {
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rtw_dbg(rtwdev, RTW_DBG_BF, "su bfer number over limit\n");
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- goto out_unlock;
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+ return;
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}
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sound_dim = vht_cap->cap &
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@@ -98,9 +102,6 @@ void rtw_bf_assoc(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
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rtw_chip_config_bfee(rtwdev, rtwvif, bfee, true);
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}
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-
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-out_unlock:
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- rcu_read_unlock();
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}
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void rtw_bf_init_bfer_entry_mu(struct rtw_dev *rtwdev,
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--
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2.39.0
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From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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To: linux-wireless@vger.kernel.org
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Cc: tony0620emma@gmail.com, kvalo@kernel.org, pkshih@realtek.com,
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s.hauer@pengutronix.de, netdev@vger.kernel.org,
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linux-kernel@vger.kernel.org,
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Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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Subject: [PATCH v3 2/3] wifi: rtw88: Use rtw_iterate_vifs() for rtw_vif_watch_dog_iter()
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Date: Sun, 8 Jan 2023 22:13:23 +0100
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Message-Id: <20230108211324.442823-3-martin.blumenstingl@googlemail.com>
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X-Mailer: git-send-email 2.39.0
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In-Reply-To: <20230108211324.442823-1-martin.blumenstingl@googlemail.com>
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References: <20230108211324.442823-1-martin.blumenstingl@googlemail.com>
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MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit
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Precedence: bulk
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List-ID: <linux-wireless.vger.kernel.org>
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X-Mailing-List: linux-wireless@vger.kernel.org
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USB and (upcoming) SDIO support may sleep in the read/write handlers.
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Make rtw_watch_dog_work() use rtw_iterate_vifs() to prevent "scheduling
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while atomic" or "Voluntary context switch within RCU read-side
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critical section!" warnings when accessing the registers using an SDIO
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card (which is where this issue has been spotted in the real world but
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it also affects USB cards).
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Fixes: 78d5bf925f30 ("wifi: rtw88: iterate over vif/sta list non-atomically")
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Suggested-by: Ping-Ke Shih <pkshih@realtek.com>
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Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
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Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
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Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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---
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v1 -> v2:
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- no change
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v2 -> v3:
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- Added Ping-Ke's Reviewed-by (thank you!)
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- Added Sascha's Tested-by (thank you!)
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- added "wifi" prefix to the subject and reworded the title accordingly
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drivers/net/wireless/realtek/rtw88/main.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
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index 888427cf3bdf..b2e78737bd5d 100644
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--- a/drivers/net/wireless/realtek/rtw88/main.c
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+++ b/drivers/net/wireless/realtek/rtw88/main.c
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@@ -241,8 +241,10 @@ static void rtw_watch_dog_work(struct work_struct *work)
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rtw_phy_dynamic_mechanism(rtwdev);
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data.rtwdev = rtwdev;
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- /* use atomic version to avoid taking local->iflist_mtx mutex */
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- rtw_iterate_vifs_atomic(rtwdev, rtw_vif_watch_dog_iter, &data);
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+ /* rtw_iterate_vifs internally uses an atomic iterator which is needed
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+ * to avoid taking local->iflist_mtx mutex
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+ */
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+ rtw_iterate_vifs(rtwdev, rtw_vif_watch_dog_iter, &data);
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/* fw supports only one station associated to enter lps, if there are
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* more than two stations associated to the AP, then we can not enter
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--
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2.39.0
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From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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To: linux-wireless@vger.kernel.org
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Cc: tony0620emma@gmail.com, kvalo@kernel.org, pkshih@realtek.com,
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s.hauer@pengutronix.de, netdev@vger.kernel.org,
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linux-kernel@vger.kernel.org,
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Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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Subject: [PATCH v3 3/3] wifi: rtw88: Use non-atomic sta iterator in rtw_ra_mask_info_update()
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Date: Sun, 8 Jan 2023 22:13:24 +0100
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Message-Id: <20230108211324.442823-4-martin.blumenstingl@googlemail.com>
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X-Mailer: git-send-email 2.39.0
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In-Reply-To: <20230108211324.442823-1-martin.blumenstingl@googlemail.com>
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References: <20230108211324.442823-1-martin.blumenstingl@googlemail.com>
|
||||||
|
MIME-Version: 1.0
|
||||||
|
Content-Transfer-Encoding: 8bit
|
||||||
|
Precedence: bulk
|
||||||
|
List-ID: <linux-wireless.vger.kernel.org>
|
||||||
|
X-Mailing-List: linux-wireless@vger.kernel.org
|
||||||
|
|
||||||
|
USB and (upcoming) SDIO support may sleep in the read/write handlers.
|
||||||
|
Use non-atomic rtw_iterate_stas() in rtw_ra_mask_info_update() because
|
||||||
|
the iterator function rtw_ra_mask_info_update_iter() needs to read and
|
||||||
|
write registers from within rtw_update_sta_info(). Using the non-atomic
|
||||||
|
iterator ensures that we can sleep during USB and SDIO register reads
|
||||||
|
and writes. This fixes "scheduling while atomic" or "Voluntary context
|
||||||
|
switch within RCU read-side critical section!" warnings as seen by SDIO
|
||||||
|
card users (but it also affects USB cards).
|
||||||
|
|
||||||
|
Fixes: 78d5bf925f30 ("wifi: rtw88: iterate over vif/sta list non-atomically")
|
||||||
|
Suggested-by: Ping-Ke Shih <pkshih@realtek.com>
|
||||||
|
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
|
||||||
|
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
|
||||||
|
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
|
||||||
|
---
|
||||||
|
v1 -> v2:
|
||||||
|
- Added Ping-Ke's Reviewed-by (thank you!)
|
||||||
|
|
||||||
|
v2 -> v3:
|
||||||
|
- Added Sascha's Tested-by (thank you!)
|
||||||
|
- added "wifi" prefix to the subject and reworded the title accordingly
|
||||||
|
|
||||||
|
|
||||||
|
drivers/net/wireless/realtek/rtw88/mac80211.c | 4 +++-
|
||||||
|
1 file changed, 3 insertions(+), 1 deletion(-)
|
||||||
|
|
||||||
|
diff --git a/drivers/net/wireless/realtek/rtw88/mac80211.c b/drivers/net/wireless/realtek/rtw88/mac80211.c
|
||||||
|
index 776a9a9884b5..3b92ac611d3f 100644
|
||||||
|
--- a/drivers/net/wireless/realtek/rtw88/mac80211.c
|
||||||
|
+++ b/drivers/net/wireless/realtek/rtw88/mac80211.c
|
||||||
|
@@ -737,7 +737,7 @@ static void rtw_ra_mask_info_update(struct rtw_dev *rtwdev,
|
||||||
|
br_data.rtwdev = rtwdev;
|
||||||
|
br_data.vif = vif;
|
||||||
|
br_data.mask = mask;
|
||||||
|
- rtw_iterate_stas_atomic(rtwdev, rtw_ra_mask_info_update_iter, &br_data);
|
||||||
|
+ rtw_iterate_stas(rtwdev, rtw_ra_mask_info_update_iter, &br_data);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int rtw_ops_set_bitrate_mask(struct ieee80211_hw *hw,
|
||||||
|
@@ -746,7 +746,9 @@ static int rtw_ops_set_bitrate_mask(struct ieee80211_hw *hw,
|
||||||
|
{
|
||||||
|
struct rtw_dev *rtwdev = hw->priv;
|
||||||
|
|
||||||
|
+ mutex_lock(&rtwdev->mutex);
|
||||||
|
rtw_ra_mask_info_update(rtwdev, vif, mask);
|
||||||
|
+ mutex_unlock(&rtwdev->mutex);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
--
|
||||||
|
2.39.0
|
||||||
|
|
||||||
Loading…
x
Reference in New Issue
Block a user