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

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Date:   Thu, 20 Jun 2019 07:01:43 +0000
From:   <kirr@...edi.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
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)

Bjorn Helgaas писал 2019-06-19 23:19:
> 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?

I meant just that it was ok to pick this change into 5.0-RT tree as 
kbuild robot was suggesting. Sorry for not being clear.

Kirill

>> > 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);
>> >