From: "Kiwoong Kim" <kwmad.kim@samsung.com>
To: "'Bart Van Assche'" <bvanassche@acm.org>,
<linux-scsi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<alim.akhtar@samsung.com>, <avri.altman@wdc.com>,
<jejb@linux.ibm.com>, <martin.petersen@oracle.com>,
<beanhuo@micron.com>, <cang@codeaurora.org>,
<adrian.hunter@intel.com>, <sc.suh@samsung.com>,
<hy50.seo@samsung.com>, <sh425.lee@samsung.com>,
<bhoon95.kim@samsung.com>, <vkumar.1997@samsung.com>
Subject: RE: [PATCH v1] scsi: ufs: remove clk_scaling_lock when clkscaling isn't supported.
Date: Thu, 17 Feb 2022 17:15:09 +0900 [thread overview]
Message-ID: <015701d823d6$7a9e5540$6fdaffc0$@samsung.com> (raw)
In-Reply-To: <6b298597-f3b3-e4a1-c59a-f704ad4c06e5@acm.org>
> On 2/14/22 22:03, Kiwoong Kim wrote:
> > The benefit that I think is not blocking dev cmd during submitting a
> scsi cmd.
>
> Hi Kiwoong,
>
> Both ufshcd_exec_dev_cmd() and previous versions of
> ufshcd_queuecommand() obtain a reader lock on the clock scaling lock so
> concurrent submission of both command types is allowed. I'm not aware of
> any version of the UFS driver that serializes device commands against SCSI
> commands.
>
> Additionally, please take a look at commit 8d077ede48c1 ("scsi: ufs:
> Optimize the command queueing code"). That patch removes the clock scaling
> lock from ufshcd_queuecommand().
>
> Thanks,
>
> Bart.
Okay, I got it.
prev parent reply other threads:[~2022-02-17 8:15 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20220205074128epcas2p40901c37a7328e825d8697f8d3269edba@epcas2p4.samsung.com>
2022-02-05 7:39 ` [PATCH v1] scsi: ufs: remove clk_scaling_lock when clkscaling isn't supported Kiwoong Kim
2022-02-06 8:20 ` Avri Altman
2022-02-11 2:15 ` Kiwoong Kim
2022-02-11 12:15 ` Adrian Hunter
2022-02-12 4:44 ` Kiwoong Kim
2022-02-14 14:31 ` Adrian Hunter
2022-02-15 11:00 ` Bean Huo
2022-02-15 17:09 ` Bart Van Assche
2022-02-17 8:12 ` Kiwoong Kim
2022-02-11 12:19 ` Avri Altman
2022-02-14 19:29 ` Bart Van Assche
2022-02-15 6:03 ` Kiwoong Kim
2022-02-15 17:15 ` Bart Van Assche
2022-02-17 8:15 ` Kiwoong Kim [this message]
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