linux-kernel - Re: [PATCH v9 8/9] scsi: ufs: Fix a racing problem btw error handler and runtime PM ops

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Date:   Tue, 04 Aug 2020 21:31:13 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Can Guo <cang@...eaurora.org>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, rnayak@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        saravanak@...gle.com, salyzyn@...gle.com,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Bart Van Assche <bvanassche@....org>,
        linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH v9 8/9] scsi: ufs: Fix a racing problem btw error
 handler and runtime PM ops


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