From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Subhash Jadavani <subhashj@codeaurora.org>
Cc: vinholikatti@gmail.com, jejb@linux.vnet.ibm.com,
martin.petersen@oracle.com,
linux-scsi@vger.kernel.org (open list:UNIVERSAL FLASH STORAGE
HOST CONTROLLER DRIVER), linux-kernel@vger.kernel.org (open list)
Subject: Re: [RESEND PATCH] scsi: ufs: fix race between clock gating and devfreq scaling work
Date: Fri, 14 Oct 2016 16:47:39 -0400 [thread overview]
Message-ID: <yq137jyk68k.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <1476227759-22389-1-git-send-email-subhashj@codeaurora.org> (Subhash Jadavani's message of "Tue, 11 Oct 2016 16:15:59 -0700")
>>>>> "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!
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2016-10-14 20:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-11 23:15 Subhash Jadavani
2016-10-14 20:47 ` Martin K. Petersen [this message]
2016-10-18 0:13 ` Subhash Jadavani
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