Re: [RESEND PATCH] scsi: ufs: fix race between clock gating and devfreq scaling work

From	Subhash Jadavani <subhashj@codeaurora.org>
Newsgroups	linux.kernel
Subject	Re: [RESEND PATCH] scsi: ufs: fix race between clock gating and devfreq scaling work
Date	2016-10-18 02:20 +0200
Message-ID	<stqil-2Hw-5@gated-at.bofh.it> (permalink)
References	<sreuZ-4zZ-5@gated-at.bofh.it> <sshAt-6iL-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 2016-10-14 13:47, Martin K. Petersen wrote:
>>>>>> "Subhash" == Subhash Jadavani <subhashj@codeaurora.org> writes:
> 
> Subhash> UFS devfreq clock scaling work may require clocks to be ON if
> Subhash> it need to execute some UFS commands hence it may request for
> Subhash> clock hold before issuing the command. But if UFS clock gating
> Subhash> work is already running in parallel, ungate work would end up
> Subhash> waiting for the clock gating work to finish and as clock 
> gating
> Subhash> work would also wait for the clock scaling work to finish, we
> Subhash> would enter in deadlock state. Here is the call trace during
> Subhash> this deadlock state:
> 
> Somebody from the UFS camp, please review!

As there was no review so far, i have moved this patch as first patch in 
the new UFS bug fixes patch series ([PATCH v1 00/11] scsi: ufs: bug 
fixes patch series #1) sent by me today.

Thanks,
Subhash

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The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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Re: [RESEND PATCH] scsi: ufs: fix race between clock gating and devfreq scaling work "Martin K. Petersen" <martin.petersen@oracle.com> - 2016-10-14 22:50 +0200
  Re: [RESEND PATCH] scsi: ufs: fix race between clock gating and  devfreq scaling work Subhash Jadavani <subhashj@codeaurora.org> - 2016-10-18 02:20 +0200

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