linux-kernel - RE: [PATCH v4 5/5] scsi: ufs: Do not free irq in suspend

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Message-ID: <MN2PR04MB69913C6C9ED425F99302D870FC4F0@MN2PR04MB6991.namprd04.prod.outlook.com>
Date:   Wed, 20 Nov 2019 15:36:59 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Can Guo <cang@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "nguyenb@...eaurora.org" <nguyenb@...eaurora.org>,
        "rnayak@...eaurora.org" <rnayak@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        "saravanak@...gle.com" <saravanak@...gle.com>,
        "salyzyn@...gle.com" <salyzyn@...gle.com>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 5/5] scsi: ufs: Do not free irq in suspend

 
> 
> If PM QoS is enabled and we set request type to PM_QOS_REQ_AFFINE_IRQ
> then freeing up the irq makes the free_irq() print out warning with call stack.
> We don't really need to free up irq during suspend, disabling it during suspend
> and reenabling it during resume should be good enough.
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>
Your approach seems reasonable,
However I failed to locate in the kernel PM_QOS_REQ_AFFINE_IRQ,
Just in codeaurora.

Is the WARN_ON in free_irq still applies?

Thanks,
Avri