linux-kernel - RE: [PATCH v3] scsi: ufs: Cleanup completed request without interrupt notification

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Message-ID: <1594720842.22878.38.camel@mtkswgap22>
Date:   Tue, 14 Jul 2020 18:00:42 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     Avri Altman <Avri.Altman@....com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
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Subject: RE: [PATCH v3] scsi: ufs: Cleanup completed request without
 interrupt notification

Hi Avri,

On Tue, 2020-07-14 at 09:29 +0000, Avri Altman wrote:
> > > > > > +cleanup:
> > > > > > +       spin_lock_irqsave(host->host_lock, flags);
> > > > > > +       if (!test_bit(tag, &hba->outstanding_reqs)) {
> > > Is this needed?  it was already checked in line 6439.
> > >
> > 
> > I am worried about the case that interrupt comes very lately. 
> scsi timeout is 30sec - do you expect an interrupt to arrive after that?
> 

Yeah, I agree that a 30s delayed interrupt sounds kind of ridiculous.
This checking is just to make the cleanup flow safer.

Thanks,
Stanley Chu