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Date:	Tue, 18 Dec 2012 17:02:56 -0800
From:	Doug Anderson <>
To:	David Rientjes <>
Cc:	Linus Torvalds <>,
	"" <>,
	Shaohua Li <>, Jens Axboe <>,
	Neil Brown <>, Tejun Heo <>,
	"Martin K. Petersen" <>,
	Vivek Goyal <>,
	Mike Snitzer <>
Subject: Re: [PATCH] block: Avoid divide by 0 when max_discard_sectors is 0


On Tue, Dec 18, 2012 at 4:42 PM, David Rientjes <> 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
> 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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