linux-kernel - Re: [BUG] scsi_device.device == NULL in sd_revalidate

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Message-ID: <20120306001146.GA31227@localhost>
Date:	Mon, 5 Mar 2012 16:11:46 -0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Josh Boyer <jwboyer@...il.com>
Cc:	"linux-fsdevel@...r.kernel.o..." <linux-fsdevel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, Jens Axboe <axboe@...nel.dk>
Subject: Re: [BUG] scsi_device.device == NULL in sd_revalidate_disk()

On Mon, Mar 05, 2012 at 07:02:08PM -0500, Josh Boyer wrote:
> On Mon, Mar 5, 2012 at 6:41 PM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> > Hi,
> >
> > I ran into a NULL dereference bug on USB key hot remove, which should
> > be caused by the below skdp->device reference
> >
> >        static int sd_revalidate_disk(struct gendisk *disk)
> >        {
> >                struct scsi_disk *sdkp = scsi_disk(disk);
> > ==>             struct scsi_device *sdp = sdkp->device;
> 
> This has been reported numerous times.  There are patches to the block layer
> that are supposed to fix it, but they haven't hit Linus' tree yet.  I think
> we're waiting on Jens to push them.

OK, thanks for the information!

Thanks,
Fengguang
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