Re: [PATCH 08/11] scsi: ufs: Improve SCSI abort handling further

[Bart Van Assche <bvanassche@acm.org>]

On 11/10/21 12:57 AM, Adrian Hunter wrote:
> On 10/11/2021 02:44, Bart Van Assche wrote:
>> Make sure that aborted commands are completed once by clearing the
>> corresponding tag bit from hba->outstanding_reqs. This patch is a
>> follow-up for commit cd892096c940 ("scsi: ufs: core: Improve SCSI
>> abort handling").
>>
>> Fixes: 7a3e97b0dc4b ("[SCSI] ufshcd: UFS Host controller driver")
>> Signed-off-by: Bart Van Assche <bvanassche@acm.org>
>> ---
>>   drivers/scsi/ufs/ufshcd.c | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index 8f5640647054..1e15ed1f639f 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -7090,6 +7090,15 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
>>   		goto release;
>>   	}
>>   
>> +	/*
>> +	 * ufshcd_try_to_abort_task() cleared the 'tag' bit in the doorbell
>> +	 * register. Clear the corresponding bit from outstanding_reqs to
>> +	 * prevent early completion.
>> +	 */
>> +	spin_lock_irqsave(&hba->outstanding_lock, flags);
>> +	__clear_bit(tag, &hba->outstanding_reqs);
>> +	spin_unlock_irqrestore(&hba->outstanding_lock, flags);
> 
> Seems like something ufshcd_clear_cmd() should be doing instead?

Hi Adrian,

I'm concerned that would break ufshcd_eh_device_reset_handler() since 
that reset handler retries SCSI commands by calling 
__ufshcd_transfer_req_compl() after having called ufshcd_clear_cmd().

Thanks,

Bart.