Re: [PATCH v2] ib umem: bugfix: mixed put_pid()s in ib_umem_get()

From: Kenneth Lee
Date: Thu Dec 29 2016 - 23:24:24 EST

Hi, Leon,

1. I do change the title except for the version number itself:) But my English
is quite bad, maybe the title is still quite stupid. I can update it according
to your advice.

2. I catched the bug by reading the final code, not by bisect-ing the old
commit. Do you means I should find out which commit introducing the bug? It will
not be easily to say which it is because it is a "missing bug", rather than a
"introduced bug". Indicate the commit may not help to remove a patch/commit from
the stable tree.

Could you please give more suggestion? Thanks.

On Thu, Dec 29, 2016 at 10:17:56AM +0200, Leon Romanovsky wrote:
> Date: Thu, 29 Dec 2016 10:17:56 +0200
> From: Leon Romanovsky <leon@xxxxxxxxxx>
> To: Kenneth Lee <liguozhu@xxxxxxxxxxxxx>
> CC: dledford@xxxxxxxxxx, sean.hefty@xxxxxxxxx, hal.rosenstock@xxxxxxxxx,
> robin.murphy@xxxxxxx, jroedel@xxxxxxx, egtvedt@xxxxxxxxxxxx,
> vgupta@xxxxxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, lstoakes@xxxxxxxxx,
> krzk@xxxxxxxxxx, sebott@xxxxxxxxxxxxxxxxxx, markb@xxxxxxxxxxxx,
> linux-rdma@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH v2] ib umem: bugfix: mixed put_pid()s in ib_umem_get()
> User-Agent: Mutt/1.7.2 (2016-11-26)
> Message-ID: <20161229081756.GI26885@xxxxxxxxxxxxxxxx>
> On Thu, Dec 29, 2016 at 04:27:28PM +0800, Kenneth Lee wrote:
> > There are two bugfixes in this patch:
> >
> > 1. When the execution go to the ib_umem_odp_get() path, pid should be put
> > back.
> > 2. When the memory allocation fail, the pid also should be put back before
> > exit.
> >
> > Signed-off-by: Kenneth Lee <liguozhu@xxxxxxxxxxxxx>
> > Reviewed-by: Haggai Eran <haggaie@xxxxxxxxxxxx>
> > ---
> > Change from v1 to v2:
> > Correcting the patch title and description
> I don't see any changes except version in the title.
> What about anything like this?
> [PATCH v3] IB/umem: Release pid in error and ODP flows
> And Fixes line please, it will help to forward it to stable trees.
> Thanks