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Date:   Thu, 06 Aug 2020 12:53:55 +0800
From:   Can Guo <cang@codeaurora.org>
To:     "Martin K. Petersen" <martin.petersen@oracle.com>
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>,
        Stanley Chu <stanley.chu@mediatek.com>,
        Bean Huo <beanhuo@micron.com>,
        Bart Van Assche <bvanassche@acm.org>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v9 8/9] scsi: ufs: Fix a racing problem btw error handler
 and runtime PM ops
In-Reply-To: <yq1r1slzxoh.fsf@ca-mkp.ca.oracle.com>
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 <1596445485-19834-9-git-send-email-cang@codeaurora.org>
 <yq1r1slzxoh.fsf@ca-mkp.ca.oracle.com>
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On 2020-08-05 09:31, Martin K. Petersen wrote:
> 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

Thanks Martin, will fix it in next version.

Can Guo.