linux-kernel - Re: [RESEND PATCH v3] scsi: ufshcd: fix possible unclocked register access

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Message-ID: <yq160oyo8jf.fsf@sermon.lab.mkp.net>
Date:   Tue, 11 Oct 2016 17:55:16 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Subhash Jadavani <subhashj@...eaurora.org>
Cc:     vinholikatti@...il.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org (open list:UNIVERSAL FLASH STORAGE HOST
        CONTROLLER DRIVER), linux-kernel@...r.kernel.org (open list)
Subject: Re: [RESEND PATCH v3] scsi: ufshcd: fix possible unclocked register access

>>>>> "Subhash" == Subhash Jadavani <subhashj@...eaurora.org> writes:

Subhash> Vendor specific setup_clocks callback may require the clocks
Subhash> managed by ufshcd driver to be ON. So if the vendor specific
Subhash> setup_clocks callback is called while the required clocks are
Subhash> turned off, it could result into unclocked register access.

Subhash> To prevent possible unclock register access, this change adds
Subhash> one more argument to setup_clocks callback to let it know
Subhash> whether it is called pre/post the clock changes by core driver.

Applied to 4.10/scsi-queue.

-- 
Martin K. Petersen	Oracle Linux Engineering