linux-kernel - Re: [PATCH] SCSI IOCTL: Check for device deletion [was Re: __elv_add

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Message-ID: <BANLkTikSXMZ3a6-e4-k5dV5vHtegxuUL-w@mail.gmail.com>
Date:	Wed, 25 May 2011 12:13:44 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	Parag Warudkar <parag.lkml@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"James.Bottomley@...senpartnership.com" 
	<James.Bottomley@...senpartnership.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH] SCSI IOCTL: Check for device deletion [was Re:
 __elv_add_request OOPS]

On Wed, May 25, 2011 at 12:02 PM, Jens Axboe <jaxboe@...ionio.com> wrote:
>
> This is before you get that far, it's actually oopsing on inserting the
> request on sdev->sdev_queue that is now NULL. The prep state checking
> happens when sr/sd pulls the request off the queue for processing.

Ok, please just add a "sdev_alive(sdev)" helper that checks for sdev
&& sdev->sdev_queue. Apparently the issue isn't "this device is
SDEV_DEL, so don't send commands". Apparently the issue is literally
"don't oops".

Or maybe the prep state checking could be moved earlier. It seems
stupid to have a "can I do this command" function that is run too late
to actually catch the problems..

                    Linus
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