Re: [PATCH] block: Avoid divide by 0 when max_discard_sectors is 0

[Doug Anderson]

David,

On Tue, Dec 18, 2012 at 4:42 PM, David Rientjes <rientjes@xxxxxxxxxx> wrote:
> On Tue, 18 Dec 2012, Doug Anderson wrote:
>
>> The recent commit "block: discard granularity might not be power of 2"
>> introduced a divide by 0 in the kernel.  Previously the code didn't
>> try to divide by discard_granularity when max_discard_sectors was 0.
>>
>> Fix the code to only do the division if max_discard_sectors is
>> specified.
>>
>
> Could you try Linus' patch at
> http://marc.info/?l=linux-kernel&m=135584941732572 and give your Tested-by
> if it solves your issue?

Hoo boy.  Thanks for the pointer.  I missed that when searching to see
if this had already been fixed.  :(

I'm pretty sure Linus's patch will fix my problem since I think my
system has "max_discard_sectors" as 0 and his patch has the same
effect as mine: avoid the divide by 0.  Someone else will need to test
his patch on a system that actually uses discard.  In any case, I will
test and send a Tested-by as soon as I'm able.

Please consider my patch abandoned.

>
> Thanks.
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