[PATCH] Fix Xilinx SystemACE driver to handle empty CF slot

Grant Likely grant.likely at secretlab.ca
Sat Mar 7 07:56:01 EST 2009

On Fri, Mar 6, 2009 at 1:46 PM, Jens Axboe <jens.axboe at oracle.com> wrote:
> On Fri, Mar 06 2009, Grant Likely wrote:
>> > The SystemACE driver does not handle an empty CF slot gracefully.  An
>> > empty CF slot ends up hanging the system.  This patch adds a check for
>> > the CF state and stops trying to process requests if the slot is empty.
> So with patches like this, it's always nice to know what your target is.
> Do you want this in .29, or just queued up for .30? It's not always easy
> to judge the urgency of such patches :-)

The driver completely falls down and hangs the system if the CF slot
is empty, so I would like to get it into .29.  On the other hand, it
has been a long standing issue, so if merging it will raise any
eyebrows then I'm okay to wait for .30.

> Also, I note that you are using end_request() throughout the driver. We
> really want to get away from that, you should be using blk_end_request()
> as that will handle full requests and not just segment-by-segment. No
> worries for this patch, but you may want to consider that for a future
> patch.

Okay, will do.


Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.

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