linux-kernel - Re: [PATCH] pci/switchtec: fix stream

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Message-ID: <20190619201859.GA197717@google.com>
Date:   Wed, 19 Jun 2019 15:19:00 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Kirill Smelkov <kirr@...edi.com>
Cc:     Julia Lawall <julia.lawall@...6.fr>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        kbuild-all@...org
Subject: Re: [PATCH] pci/switchtec: fix stream_open.cocci warnings (fwd)

On Wed, Jun 19, 2019 at 04:27:52PM +0000, Kirill Smelkov wrote:
> Hi Julia, everyone.
> 
> On Wed, Jun 19, 2019 at 12:28:47PM +0200, Julia Lawall wrote:
> > Hi,
> > 
> > Can you forward this patch to the people below if you think it is
> > appropriate?
> 
> Yes, this patch is appropriate. It was actually part of
> git.kernel.org/linus/c5bf68fe0c86 . It should be safe, (and desirable as
> it removes a chance for deadlock) to apply it. 
> 
> Sebastian, Kurt, Logan, Bjorn, please consider picking it up.

I don't get it.  This appeared in v5.2-rc1 as c5bf68fe0c86 ("*: convert
stream-like files from nonseekable_open -> stream_open"), so it looks like
this is already done.  What would you like me to do with it?

> > Could I tell the kbuild people to add you to the CC list for
> > this semantic patch?
> 
> Yes, sure. Please feel free to add me to CC list for stream_open.cocci
> related patches.
> 
> Kirill
> 
> 
> > thanks,
> > julia
> > 
> > ---------- Forwarded message ----------
> > Date: Wed, 19 Jun 2019 18:23:18 +0800
> > From: kbuild test robot <lkp@...el.com>
> > To: kbuild@...org
> > Cc: Julia Lawall <julia.lawall@...6.fr>
> > Subject: [PATCH] pci/switchtec: fix stream_open.cocci warnings
> > 
> > CC: kbuild-all@...org
> > TO: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> > CC: Kurt Schwemmer <kurt.schwemmer@...rosemi.com>
> > CC: Logan Gunthorpe <logang@...tatee.com>
> > CC: Bjorn Helgaas <helgaas@...nel.org>
> > CC: linux-pci@...r.kernel.org
> > CC: linux-kernel@...r.kernel.org
> > 
> > From: kbuild test robot <lkp@...el.com>
> > 
> > drivers/pci/switch/switchtec.c:395:1-17: ERROR: switchtec_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix.
> > 
> > Generated by: scripts/coccinelle/api/stream_open.cocci
> > 
> > Fixes: a3a1e895d4fa ("pci/switchtec: Don't use completion's wait queue")
> > Signed-off-by: kbuild test robot <lkp@...el.com>
> > ---
> > 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.0.y-rt-rebase
> > head:   31cc76d5590f5e60c2f26f029e40bc7d0441d93f
> > commit: a3a1e895d4fa0508e11ac9107ace883a5b2a4d3b [171/305] pci/switchtec: Don't use completion's wait queue
> > :::::: branch date: 6 days ago
> > :::::: commit date: 6 days ago
> > 
> > Please take the patch only if it's a positive warning. Thanks!
> > 
> >  switchtec.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > --- a/drivers/pci/switch/switchtec.c
> > +++ b/drivers/pci/switch/switchtec.c
> > @@ -392,7 +392,7 @@ static int switchtec_dev_open(struct ino
> >  		return PTR_ERR(stuser);
> > 
> >  	filp->private_data = stuser;
> > -	nonseekable_open(inode, filp);
> > +	stream_open(inode, filp);
> > 
> >  	dev_dbg(&stdev->dev, "%s: %p\n", __func__, stuser);
> >