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>,
Adrian Hunter <adrian.hunter@intel.com>,
Kiwoong Kim <kwmad.kim@samsung.com>,
Satya Tangirala <satyat@google.com>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 1/9] scsi: ufs: Differentiate status between hba pm ops and wl pm ops
Date: Wed, 23 Jun 2021 09:32:28 +0800 [thread overview]
Message-ID: <d3a80cdc7435238a26315c0631df2862@codeaurora.org> (raw)
In-Reply-To: <a5804465-2ad4-f122-0458-dcdd75f39310@acm.org>
Hi Bart,
On 2021-06-17 01:50, Bart Van Assche wrote:
> On 6/9/21 9:43 PM, Can Guo wrote:
>> @@ -8784,7 +8786,7 @@ static int __ufshcd_wl_suspend(struct ufs_hba
>> *hba, enum ufs_pm_op pm_op)
>> enum ufs_dev_pwr_mode req_dev_pwr_mode;
>> enum uic_link_state req_link_state;
>>
>> - hba->pm_op_in_progress = true;
>> + hba->wl_pm_op_in_progress = true;
>> if (pm_op != UFS_SHUTDOWN_PM) {
>> pm_lvl = pm_op == UFS_RUNTIME_PM ?
>> hba->rpm_lvl : hba->spm_lvl;
>> @@ -8919,7 +8921,7 @@ static int __ufshcd_wl_suspend(struct ufs_hba
>> *hba, enum ufs_pm_op pm_op)
>> hba->clk_gating.is_suspended = false;
>> ufshcd_release(hba);
>> }
>> - hba->pm_op_in_progress = false;
>> + hba->wl_pm_op_in_progress = false;
>> return ret;
>> }
>
> Are the __ufshcd_wl_suspend() calls serialized in any way? If not, will
> the value of wl_pm_op_in_progress be incorrect if multiple kernel
> threads run __ufshcd_wl_suspend() concurrently and one of the
> __ufshcd_wl_suspend() instances returns earlier than the other?
>
Sorry for getting back late on this... I was stuck by some urgent
issues.
Yes, __ufshcd_wl_suspend() calls are serilized, because it is called by
either runtime suspend or system suspend, and runtime suspend and system
suspend are serialized - Rafael J. Wysocki has put a lot of efforts on
it,
see also 1e2ef05bb8cf8 ("PM: Limit race conditions between runtime PM
and
system sleep (v2)")).
> Thanks,
>
> Bart.
next prev parent reply other threads:[~2021-06-23 1:32 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 [this message]
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
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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