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Bottomley" , "Martin K. Petersen" , Stanley Chu , Bean Huo , Jaegeuk Kim , open list Subject: Re: [PATCH v2 1/3] scsi: ufs: Minor adjustments to error handling In-Reply-To: References: <1614145010-36079-1-git-send-email-cang@codeaurora.org> <1614145010-36079-2-git-send-email-cang@codeaurora.org> Message-ID: <3c6df42fef5a1e52e655753aadec4a11@codeaurora.org> X-Sender: cang@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Avri, On 2021-03-03 15:22, Avri Altman wrote: >> >> >> In error handling prepare stage, after SCSI requests are blocked, do a >> down/up_write(clk_scaling_lock) to clean up the queuecommand() path. >> Meanwhile, stop eeh_work in case it disturbs error recovery. Moreover, >> reset ufshcd_state at the entrance of ufshcd_probe_hba(), since it may >> be >> called multiple times during error recovery. >> >> Signed-off-by: Can Guo > I noticed that you tagged Adrian's patch - > https://lore.kernel.org/lkml/20210301191940.15247-1-adrian.hunter@intel.com/ > So this patch needs to be adjusted accordingly? Thanks for pointing me to that one, I will rebase mine. Regards, Can Guo. > > Thanks, > Avri > >> --- >> drivers/scsi/ufs/ufshcd.c | 18 ++++++++++++------ >> 1 file changed, 12 insertions(+), 6 deletions(-) >> >> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c >> index 80620c8..013eb73 100644 >> --- a/drivers/scsi/ufs/ufshcd.c >> +++ b/drivers/scsi/ufs/ufshcd.c >> @@ -4987,6 +4987,7 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, >> struct ufshcd_lrb *lrbp) >> * UFS device needs urgent BKOPs. >> */ >> if (!hba->pm_op_in_progress && >> + !ufshcd_eh_in_progress(hba) && >> >> ufshcd_is_exception_event(lrbp->ucd_rsp_ptr) && >> schedule_work(&hba->eeh_work)) { >> /* >> @@ -5784,13 +5785,20 @@ static void ufshcd_err_handling_prepare(struct >> ufs_hba *hba) >> ufshcd_suspend_clkscaling(hba); >> ufshcd_clk_scaling_allow(hba, false); >> } >> + ufshcd_scsi_block_requests(hba); >> + /* Drain ufshcd_queuecommand() */ >> + down_write(&hba->clk_scaling_lock); >> + up_write(&hba->clk_scaling_lock); >> + cancel_work_sync(&hba->eeh_work); >> } >> >> static void ufshcd_err_handling_unprepare(struct ufs_hba *hba) >> { >> + ufshcd_scsi_unblock_requests(hba); >> ufshcd_release(hba); >> if (ufshcd_is_clkscaling_supported(hba)) >> ufshcd_clk_scaling_suspend(hba, false); >> + ufshcd_clear_ua_wluns(hba); >> pm_runtime_put(hba->dev); >> } >> >> @@ -5882,8 +5890,8 @@ static void ufshcd_err_handler(struct >> work_struct >> *work) >> spin_unlock_irqrestore(hba->host->host_lock, flags); >> ufshcd_err_handling_prepare(hba); >> spin_lock_irqsave(hba->host->host_lock, flags); >> - ufshcd_scsi_block_requests(hba); >> - hba->ufshcd_state = UFSHCD_STATE_RESET; >> + if (hba->ufshcd_state != UFSHCD_STATE_ERROR) >> + hba->ufshcd_state = UFSHCD_STATE_RESET; >> >> /* Complete requests that have door-bell cleared by h/w */ >> ufshcd_complete_requests(hba); >> @@ -6042,12 +6050,8 @@ static void ufshcd_err_handler(struct >> work_struct >> *work) >> } >> ufshcd_clear_eh_in_progress(hba); >> spin_unlock_irqrestore(hba->host->host_lock, flags); >> - ufshcd_scsi_unblock_requests(hba); >> ufshcd_err_handling_unprepare(hba); >> up(&hba->host_sem); >> - >> - if (!err && needs_reset) >> - ufshcd_clear_ua_wluns(hba); >> } >> >> /** >> @@ -7858,6 +7862,8 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, >> bool async) >> unsigned long flags; >> ktime_t start = ktime_get(); >> >> + hba->ufshcd_state = UFSHCD_STATE_RESET; >> + >> ret = ufshcd_link_startup(hba); >> if (ret) >> goto out; >> -- >> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a >> Linux >> Foundation Collaborative Project.