Re: [PATCH v3 1/2] nilfs2: remove double bio_put() in nilfs_end_bio_write() for BIO_EOPNOTSUPP error

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On Wed, 14 Aug 2013 01:51:48 +0900 (JST) Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx> wrote:

> On Tue, 13 Aug 2013 17:50:33 +0400, Vyacheslav Dubeyko wrote:
> > From: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
> > Subject: [PATCH v3 1/2] nilfs2: remove double bio_put() in nilfs_end_bio_write() for BIO_EOPNOTSUPP error
> > 
> > This patch removes double call of bio_put() in nilfs_end_bio_write()
> > for the case of BIO_EOPNOTSUPP error detection. The issue was found
> > by Dan Carpenter and he suggests first version of the fix too.
> > 
> > Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> > Signed-off-by: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
> > CC: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
> 
> Acked-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
> Tested-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
> 
> I tested this patch by inserting a pseudo EOPNOTSUPP error, and this
> actually fixed a crach "kernel BUG at fs/bio.c:498!" due to reference
> count underflow of bio_put() that nilfs_end_bio_write() induced.
> 
> 
> Andrew, please pick up this bug-fix preferably for this cycle.

Should we apply the fix to earlier kernel versions and if so, how
far back in time does it go?

Thanks.
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