linux-kernel - [PATCH] nvme: fix uninitialized-variable warning

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Date:   Tue,  7 Jan 2020 22:42:08 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>
Cc:     Oleksandr Natalenko <oleksandr@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        Hannes Reinecke <hare@...e.de>,
        Marta Rybczynska <mrybczyn@...ray.eu>,
        Bart Van Assche <bvanassche@....org>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] nvme: fix uninitialized-variable warning

gcc -O3 adds a bogus warning in this file:

In file included from include/linux/compiler_types.h:68,
                 from <command-line>:
drivers/nvme/host/core.c: In function 'nvme_set_queue_count':
include/linux/compiler-gcc.h:71:45: error: 'res.u32' may be used uninitialized in this function [-Werror=maybe-uninitialized]
 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
                                             ^~~~~~~~~~~~
drivers/nvme/host/core.c:1167:20: note: 'res.u32' was declared here
  union nvme_result res;
                    ^~~

Slightly rearrange the code, enough to let gcc understand
better what is going on and not warn about it.

Fixes: mmtom ("init/Kconfig: enable -O3 for all arches")
Signed-off-by: Arnd Bergmann <arnd@...db.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;
 
 	req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
 
 	if (buffer && bufflen) {
 		ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
-		if (ret)
+		if (ret < 0)
 			goto out;
 	}
 
-- 
2.20.0