From: Can Guo <cang@codeaurora.org>
To: Bart Van Assche <bvanassche@acm.org>
Cc: asutoshd@codeaurora.org, nguyenb@codeaurora.org,
hongwus@codeaurora.org, ziqichen@codeaurora.org,
linux-scsi@vger.kernel.org, kernel-team@android.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>, Jaegeuk Kim <jaegeuk@kernel.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 4/9] scsi: ufs: Complete the cmd before returning in queuecommand
Date: Sat, 12 Jun 2021 15:38:14 +0800 [thread overview]
Message-ID: <80926df7e3e41088e59ce5e0dbdec28a@codeaurora.org> (raw)
In-Reply-To: <d017548a-16fb-8ad0-2363-09dad00c9642@acm.org>
On 2021-06-12 04:52, Bart Van Assche wrote:
> On 6/9/21 9:43 PM, Can Guo wrote:
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index 0c9d2ee..7dc0fda 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -2758,6 +2758,16 @@ static int ufshcd_queuecommand(struct Scsi_Host
>> *host, struct scsi_cmnd *cmd)
>> goto out;
>> }
>>
>> + if (unlikely(test_bit(tag, &hba->outstanding_reqs))) {
>> + if (hba->wl_pm_op_in_progress) {
>> + set_host_byte(cmd, DID_BAD_TARGET);
>> + cmd->scsi_done(cmd);
>> + } else {
>> + err = SCSI_MLQUEUE_HOST_BUSY;
>> + }
>> + goto out;
>> + }
>> +
>> hba->req_abort_count = 0;
>>
>> err = ufshcd_hold(hba, true);
>> @@ -2768,15 +2778,6 @@ static int ufshcd_queuecommand(struct Scsi_Host
>> *host, struct scsi_cmnd *cmd)
>> WARN_ON(ufshcd_is_clkgating_allowed(hba) &&
>> (hba->clk_gating.state != CLKS_ON));
>>
>> - if (unlikely(test_bit(tag, &hba->outstanding_reqs))) {
>> - if (hba->wl_pm_op_in_progress)
>> - set_host_byte(cmd, DID_BAD_TARGET);
>> - else
>> - err = SCSI_MLQUEUE_HOST_BUSY;
>> - ufshcd_release(hba);
>> - goto out;
>> - }
>> -
>> lrbp = &hba->lrb[tag];
>> WARN_ON(lrbp->cmd);
>> lrbp->cmd = cmd;
>
> Can the code under "if (unlikely(test_bit(tag,
> &hba->outstanding_reqs)))" be deleted instead of moving it? I don't
> think that it is useful to verify whether the block layer tag allocator
> works correctly. Additionally, I'm not aware of any similar code in any
> other SCSI LLD.
>
ufshcd_abort() aborts PM requests differently from other requests -
it simply evicts the cmd from lrbp [1], schedules error handler and
returns SUCCESS (the reason why I am doing it this way is in patch #8).
After ufshcd_abort() returns, the tag shall be released, the logic
here is to prevent subsequent cmds re-use the lrbp [1] before error
handler recovers the device and host.
Thanks,
Can Guo.
> Thanks,
>
> Bart.
next prev parent reply other threads:[~2021-06-12 7:38 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-10 4:43 [PATCH v3 0/9] Complementary changes for error handling Can Guo
2021-06-10 4:43 ` [PATCH v3 1/9] scsi: ufs: Differentiate status between hba pm ops and wl pm ops Can Guo
2021-06-10 11:15 ` Adrian Hunter
2021-06-11 0:53 ` Can Guo
2021-06-11 20:40 ` Bart Van Assche
2021-06-12 6:20 ` Can Guo
2021-06-16 17:50 ` Bart Van Assche
2021-06-23 1:32 ` Can Guo
2021-06-10 4:43 ` [PATCH v3 2/9] scsi: ufs: Update the return value of supplier " Can Guo
2021-06-10 4:43 ` [PATCH v3 3/9] scsi: ufs: Enable IRQ after enabling clocks in error handling preparation Can Guo
2021-06-10 4:43 ` [PATCH v3 4/9] scsi: ufs: Complete the cmd before returning in queuecommand Can Guo
2021-06-11 20:52 ` Bart Van Assche
2021-06-12 7:38 ` Can Guo [this message]
2021-06-12 15:50 ` Bart Van Assche
2021-06-13 13:30 ` Can Guo
2021-06-10 4:43 ` [PATCH v3 5/9] scsi: ufs: Simplify error handling preparation Can Guo
2021-06-10 12:30 ` Adrian Hunter
2021-06-11 3:01 ` Can Guo
2021-06-11 20:58 ` Bart Van Assche
2021-06-12 6:46 ` Can Guo
2021-06-12 9:49 ` Can Guo
2021-06-10 4:43 ` [PATCH v3 6/9] scsi: ufs: Update ufshcd_recover_pm_error() Can Guo
2021-06-10 4:43 ` [PATCH v3 7/9] scsi: ufs: Let host_sem cover the entire system suspend/resume Can Guo
2021-06-10 13:32 ` Adrian Hunter
2021-06-11 3:06 ` Can Guo
2021-06-11 21:00 ` Bart Van Assche
2021-06-12 6:46 ` Can Guo
2021-06-10 4:43 ` [PATCH v3 8/9] scsi: ufs: Update the fast abort path in ufshcd_abort() for PM requests Can Guo
2021-06-11 21:02 ` Bart Van Assche
2021-06-12 7:07 ` Can Guo
2021-06-12 16:50 ` Bart Van Assche
2021-06-13 14:42 ` Can Guo
2021-06-14 18:49 ` Bart Van Assche
2021-06-15 2:36 ` Can Guo
2021-06-15 3:17 ` Can Guo
2021-06-15 18:25 ` Bart Van Assche
2021-06-16 4:00 ` Can Guo
2021-06-16 4:40 ` Bart Van Assche
2021-06-16 8:47 ` Can Guo
2021-06-16 17:55 ` Bart Van Assche
2021-06-23 1:34 ` Can Guo
2021-06-10 4:43 ` [PATCH v3 9/9] scsi: ufs: Apply more limitations to user access Can Guo
2021-06-11 21:03 ` Bart Van Assche
2021-06-12 7:13 ` Can Guo
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