From: Stanley Chu <stanley.chu@mediatek.com>
To: Can Guo <cang@codeaurora.org>
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>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Bean Huo <beanhuo@micron.com>,
"Bart Van Assche" <bvanassche@acm.org>,
Venkat Gopalakrishnan <venkatg@codeaurora.org>,
Tomas Winkler <tomas.winkler@intel.com>,
"open list" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 1/1] scsi: ufs: Enable block layer runtime PM for well-known logical units
Date: Thu, 26 Mar 2020 16:17:14 +0800 [thread overview]
Message-ID: <1585210634.4609.1.camel@mtksdccf07> (raw)
In-Reply-To: <1585185003-31156-1-git-send-email-cang@codeaurora.org>
Hi Can,
On Wed, 2020-03-25 at 18:09 -0700, Can Guo wrote:
> Block layer RPM is enabled for the genernal UFS SCSI devices when they are
> probed by their driver. However block layer RPM is not enabled for UFS
> well-known SCSI devices.
>
> As UFS SCSI devices have their corresponding BSG char devices, accessing
> a BSG char device via IOCTL may send requests to its corresponding SCSI
> device through its request queue. If BSG IOCTL sends a request to a
> well-known SCSI device when hba is not runtime active, due to block layer
> RPM is not eanbled for the well-known SCSI devices, hba, which is at the
> top of a scsi device's parent chain, shall not be resumed, then unexpected
> error would happen.
>
> This change enables block layer RPM for the well-known SCSI devices, so
> that block layer can handle RPM for the well-known SCSI devices just like
> for the general SCSI devices.
>
> Signed-off-by: Can Guo <cang@codeaurora.org>
> Reviewed-by: Avri Altman <avri.altman@wdc.com>
Looks good!
Thanks to make RPM for UFS completed!
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
next parent reply other threads:[~2020-03-26 8:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1585185003-31156-1-git-send-email-cang@codeaurora.org>
2020-03-26 8:17 ` Stanley Chu [this message]
2020-03-27 2:31 ` [PATCH v4 1/1] scsi: ufs: Enable block layer runtime PM for well-known logical units Martin K. Petersen
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