From: Arnd Bergmann <arnd@arndb.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Oleksandr Natalenko <oleksandr@redhat.com>,
Bart Van Assche <bvanassche@acm.org>,
Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>,
Marta Rybczynska <mrybczyn@kalray.eu>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
linux-nvme@lists.infradead.org, Jens Axboe <axboe@fb.com>,
Hannes Reinecke <hare@suse.de>, Keith Busch <kbusch@kernel.org>,
Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>
Subject: Re: [PATCH] nvme: fix uninitialized-variable warning
Date: Thu, 30 Jan 2020 16:36:48 +0100 [thread overview]
Message-ID: <CAK8P3a0EgfQkrSr77jE12Wm_NKemEZ1rFZLMcVhkAuu1cwOOWQ@mail.gmail.com> (raw)
In-Reply-To: <20200130150451.GA25427@infradead.org>
On Thu, Jan 30, 2020 at 4:04 PM Christoph Hellwig <hch@infradead.org> wrote:
>
> On Tue, Jan 07, 2020 at 10:42:08PM +0100, Arnd Bergmann wrote:
> > Fixes: mmtom ("init/Kconfig: enable -O3 for all arches")
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > ---
> > drivers/nvme/host/core.c | 7 ++++---
> > 1 file changed, 4 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> > index 667f18f465be..6f0991e8c5cc 100644
> > --- a/drivers/nvme/host/core.c
> > +++ b/drivers/nvme/host/core.c
> > @@ -825,14 +825,15 @@ int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
> > int ret;
> >
> > req = nvme_alloc_request(q, cmd, flags, qid);
> > - if (IS_ERR(req))
> > - return PTR_ERR(req);
> > + ret = PTR_ERR_OR_ZERO(req);
> > + if (ret < 0)
> > + return ret;
>
> This one is just gross. I think we'll need to find some other fix
> that doesn't obsfucate the code as much.
Initializing the nvme_result in nvme_features() would do it, as would
setting it in the error path in __nvme_submit_sync_cmd() -- either
way the compiler cannot be confused about whether it is initialized
later on.
Arnd
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next prev parent reply other threads:[~2020-01-30 15:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-07 21:42 [PATCH] nvme: fix uninitialized-variable warning Arnd Bergmann
2020-01-30 15:04 ` Christoph Hellwig
2020-01-30 15:36 ` Arnd Bergmann [this message]
2020-01-30 15:48 ` Christoph Hellwig
2020-02-13 19:51 ` Keith Busch
2020-02-19 15:21 ` Christoph Hellwig
2020-02-19 16:19 [PATCH] nvme: Fix " Keith Busch
2020-02-19 16:22 ` Christoph Hellwig
2020-02-20 7:43 ` Sagi Grimberg
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