From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Can Guo <cang@codeaurora.org>
Cc: asutoshd@codeaurora.org, nguyenb@codeaurora.org,
hongwus@codeaurora.org, rnayak@codeaurora.org,
linux-scsi@vger.kernel.org, kernel-team@android.com,
saravanak@google.com, salyzyn@google.com,
Alim Akhtar <alim.akhtar@samsung.com>,
Avri Altman <avri.altman@wdc.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Stanley Chu <stanley.chu@mediatek.com>,
Bean Huo <beanhuo@micron.com>,
Bart Van Assche <bvanassche@acm.org>,
linux-kernel@vger.kernel.org (open list)
Subject: Re: [PATCH v9 8/9] scsi: ufs: Fix a racing problem btw error handler and runtime PM ops
Date: Tue, 04 Aug 2020 21:31:13 -0400 [thread overview]
Message-ID: <yq1r1slzxoh.fsf@ca-mkp.ca.oracle.com> (raw)
In-Reply-To: <1596445485-19834-9-git-send-email-cang@codeaurora.org> (Can Guo's message of "Mon, 3 Aug 2020 02:04:43 -0700")
Can,
> Current IRQ handler blocks scsi requests before scheduling eh_work,
> when error handler calls pm_runtime_get_sync, if ufshcd_suspend/resume
> sends a scsi cmd, most likely the SSU cmd, since scsi requests are
> blocked, pm_runtime_get_sync() will never return because
> ufshcd_suspend/reusme is blocked by the scsi cmd. Some changes and
> code re-arrangement can be made to resolve it.
CC [M] drivers/scsi/ufs/ufshcd.o
drivers/scsi/ufs/ufshcd.c: In function ‘ufshcd_queuecommand’:
drivers/scsi/ufs/ufshcd.c:2570:6: error: this statement may fall through [-Werror=implicit-fallthrough=]
2570 | if (hba->pm_op_in_progress) {
| ^
drivers/scsi/ufs/ufshcd.c:2575:2: note: here
2575 | case UFSHCD_STATE_RESET:
| ^~~~
cc1: all warnings being treated as errors
make[3]: *** [scripts/Makefile.build:280: drivers/scsi/ufs/ufshcd.o] Error 1
make[2]: *** [scripts/Makefile.build:497: drivers/scsi/ufs] Error 2
make[1]: *** [scripts/Makefile.build:497: drivers/scsi] Error 2
make: *** [Makefile:1764: drivers] Error 2
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2020-08-05 1:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-03 9:04 [PATCH v9 0/9] Fix up and simplify error recovery mechanism Can Guo
2020-08-03 9:04 ` [PATCH v9 1/9] scsi: ufs: Add checks before setting clk-gating states Can Guo
2020-08-03 9:04 ` [PATCH v9 2/9] ufs: ufs-qcom: Fix race conditions caused by func ufs_qcom_testbus_config Can Guo
2020-08-03 9:04 ` [PATCH v9 3/9] scsi: ufs-qcom: Remove testbus dump in ufs_qcom_dump_dbg_regs Can Guo
2020-08-03 9:04 ` [PATCH v9 4/9] scsi: ufs: Add some debug infos to ufshcd_print_host_state Can Guo
2020-08-03 9:04 ` [PATCH v9 5/9] scsi: ufs: Fix concurrency of error handler and other error recovery paths Can Guo
2020-08-03 9:04 ` [PATCH v9 6/9] scsi: ufs: Recover hba runtime PM error in error handler Can Guo
2020-08-03 9:04 ` [PATCH v9 7/9] scsi: ufs: Move dumps in IRQ handler to " Can Guo
2020-08-03 16:02 ` Asutosh Das (asd)
2020-08-03 9:04 ` [PATCH v9 8/9] scsi: ufs: Fix a racing problem btw error handler and runtime PM ops Can Guo
2020-08-05 1:31 ` Martin K. Petersen [this message]
2020-08-06 4:53 ` Can Guo
2020-08-03 9:04 ` [PATCH v9 9/9] scsi: ufs: Properly release resources if a task is aborted successfully Can Guo
2020-08-03 9:44 ` Stanley Chu
2020-08-07 23:50 ` [PATCH v9 0/9] Fix up and simplify error recovery mechanism Asutosh Das (asd)
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