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Fri, 28 Jun 2024 00:00:37 -0700 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Fri, 28 Jun 2024 15:00:32 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Fri, 28 Jun 2024 15:00:32 +0800 From: To: , , , , CC: , , , , , , , , , , , , , , , Subject: [PATCH v3 1/2] ufs: core: fix ufshcd_clear_cmd racing issue Date: Fri, 28 Jun 2024 15:00:29 +0800 Message-ID: <20240628070030.30929-2-peter.wang@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20240628070030.30929-1-peter.wang@mediatek.com> References: <20240628070030.30929-1-peter.wang@mediatek.com> MIME-Version: 1.0 X-TM-AS-Product-Ver: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-AS-Result: No-10--11.414900-8.000000 X-TMASE-MatchedRID: fnR2S3QqRUoMQLXc2MGSbEKcYi5Qw/RVNACnndLvXwfIvQIyugvKdaEP LQgibzEi9dqfQ8cn44p1Mm/bnHYgUB2P280ZiGmRnu1HSadECDWuiRuR9mCaukX2ZslDQzOjnCc +RLKEo8YLMCxkuTq/ZJPkifTzZWVPEd0YyW6tLbnk7k9yXJiqqoiuaoNXJrK/47E6rstCUYsQr5 8JtEoLH4xkEcgY5pLA4Fs8REBewRHDiZmOF0V5Feuhtmmz4+rYMB97xsSzwcJbi1ZFDTzcNG19g M1gDJGc4vM1YF6AJbbGXyXDzkRpVAtuKBGekqUpI/NGWt0UYPBJl7pFycsuwIOU3H+O8qhagp78 MHEGFTgd1y1FoLGxsFGUsNMK829j X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--11.414900-8.000000 X-TMASE-Version: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-SNTS-SMTP: B9C48369B76D977127D7B415F5DCEC9B2060AADCEDF948C795BFF5E2B3F4ED782000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240628_000042_245831_FEC025FE X-CRM114-Status: GOOD ( 13.23 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org From: Peter Wang When ufshcd_clear_cmd racing with complete ISR, the completed tag of request's mq_hctx pointer will set NULL by ISR. And ufshcd_clear_cmd call ufshcd_mcq_req_to_hwq will get NULL pointer KE. Return success when request is completed by ISR beacuse sq dosen't need cleanup. The racing flow is: Thread A ufshcd_err_handler step 1 ufshcd_try_to_abort_task ufshcd_cmd_inflight(true) step 3 ufshcd_clear_cmd ... ufshcd_mcq_req_to_hwq blk_mq_unique_tag rq->mq_hctx->queue_num step 5 Thread B ufs_mtk_mcq_intr(cq complete ISR) step 2 scsi_done ... __blk_mq_free_request rq->mq_hctx = NULL; step 4 Below is KE back trace: ufshcd_try_to_abort_task: cmd pending in the device. tag = 6 Unable to handle kernel NULL pointer dereference at virtual address 0000000000000194 pc : [0xffffffd589679bf8] blk_mq_unique_tag+0x8/0x14 lr : [0xffffffd5862f95b4] ufshcd_mcq_sq_cleanup+0x6c/0x1cc [ufs_mediatek_mod_ise] Workqueue: ufs_eh_wq_0 ufshcd_err_handler [ufs_mediatek_mod_ise] Call trace: dump_backtrace+0xf8/0x148 show_stack+0x18/0x24 dump_stack_lvl+0x60/0x7c dump_stack+0x18/0x3c mrdump_common_die+0x24c/0x398 [mrdump] ipanic_die+0x20/0x34 [mrdump] notify_die+0x80/0xd8 die+0x94/0x2b8 __do_kernel_fault+0x264/0x298 do_page_fault+0xa4/0x4b8 do_translation_fault+0x38/0x54 do_mem_abort+0x58/0x118 el1_abort+0x3c/0x5c el1h_64_sync_handler+0x54/0x90 el1h_64_sync+0x68/0x6c blk_mq_unique_tag+0x8/0x14 ufshcd_clear_cmd+0x34/0x118 [ufs_mediatek_mod_ise] ufshcd_try_to_abort_task+0x2c8/0x5b4 [ufs_mediatek_mod_ise] ufshcd_err_handler+0xa7c/0xfa8 [ufs_mediatek_mod_ise] process_one_work+0x208/0x4fc worker_thread+0x228/0x438 kthread+0x104/0x1d4 ret_from_fork+0x10/0x20 Fixes: 8d7290348992 ("scsi: ufs: mcq: Add supporting functions for MCQ abort") Cc: 6.6.x Suggested-by: Bart Van Assche Signed-off-by: Peter Wang Reviewed-by: Bart Van Assche --- drivers/ufs/core/ufs-mcq.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c index 8944548c30fa..c532416aec22 100644 --- a/drivers/ufs/core/ufs-mcq.c +++ b/drivers/ufs/core/ufs-mcq.c @@ -105,16 +105,15 @@ EXPORT_SYMBOL_GPL(ufshcd_mcq_config_mac); * @hba: per adapter instance * @req: pointer to the request to be issued * - * Return: the hardware queue instance on which the request would - * be queued. + * Return: the hardware queue instance on which the request will be or has + * been queued. %NULL if the request has already been freed. */ struct ufs_hw_queue *ufshcd_mcq_req_to_hwq(struct ufs_hba *hba, struct request *req) { - u32 utag = blk_mq_unique_tag(req); - u32 hwq = blk_mq_unique_tag_to_hwq(utag); + struct blk_mq_hw_ctx *hctx = READ_ONCE(req->mq_hctx); - return &hba->uhq[hwq]; + return hctx ? &hba->uhq[hctx->queue_num] : NULL; } /** @@ -515,6 +514,8 @@ int ufshcd_mcq_sq_cleanup(struct ufs_hba *hba, int task_tag) if (!cmd) return -EINVAL; hwq = ufshcd_mcq_req_to_hwq(hba, scsi_cmd_to_rq(cmd)); + if (!hwq) + return 0; } else { hwq = hba->dev_cmd_queue; }