linux-kernel - Re: [PATCH] xsysace: Fix error handling in ace

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Date:   Sat, 6 Apr 2019 12:34:23 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Jens Axboe <axboe@...nel.dk>,
        Michal Simek <michal.simek@...inx.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xsysace: Fix error handling in ace_setup

On 4/5/19 4:06 PM, Jens Axboe wrote:
> On 4/5/19 4:44 PM, Guenter Roeck wrote:
>> Hi,
>>
>> On Tue, Feb 19, 2019 at 08:49:56AM -0800, Guenter Roeck wrote:
>>> If xace hardware reports a bad version number, the error handling code
>>> in ace_setup() calls put_disk(), followed by queue cleanup. However, since
>>> the disk data structure has the queue pointer set, put_disk() also
>>> cleans and releases the queue. This results in blk_cleanup_queue()
>>> accessing an already released data structure, which in turn may result
>>> in a crash such as the following.
>>>
>>
>> This crash is now quite persistent in mainline. The fix didn't make it.
>> Should I stop testing virtex-ml507 with qemu ?
> 
> I've applied the fix now.
> 
> But given Michal's comments, should we kill the driver for 5.2?
> 

If the driver is no longer used or maintained, removing it would indeed
make sense.

Guenter