linux-kernel - Re: [PATCH] block: Avoid divide by 0 when max_discard

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Message-ID: <alpine.DEB.2.00.1212181641050.3932@chino.kir.corp.google.com>
Date:	Tue, 18 Dec 2012 16:42:04 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Doug Anderson <dianders@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
	Jens Axboe <axboe@...nel.dk>, Neil Brown <neilb@...e.de>,
	Tejun Heo <tj@...nel.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>
Subject: Re: [PATCH] block: Avoid divide by 0 when max_discard_sectors is 0

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?

Thanks.
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