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

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Date:   Wed, 19 Jun 2019 16:27:53 +0000
From:   Kirill Smelkov <kirr@...edi.com>
To:     Julia Lawall <julia.lawall@...6.fr>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kbuild-all@...org>
Subject: Re: [PATCH] pci/switchtec: fix stream_open.cocci warnings (fwd)

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.

> 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);
>