From: Olivier Matz <olivier.matz@6wind.com>
Date: Mon, 11 Sep 2017 15:13:28 +0000 (+0200)
Subject: uio: fix compilation with -Og
X-Git-Tag: spdx-start~1779
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=84585f330fc3d5296d9b660bb639ebc8c7bf2aff;p=dpdk.git

uio: fix compilation with -Og

The compilation with gcc-6.3.0 and EXTRA_CFLAGS=-Og gives the following
error:

  CC eal_pci_uio.o
  eal_pci_uio.c: In function ‘pci_get_uio_de ’:
  eal_pci_uio.c:221:9: error: ‘uio_num’ may be used uninitialized in
                       this function [-Werror=maybe-uninitialized]
  return uio_num;
         ^~~~~~~

This is a false positive: gcc is not able to see that when e != NULL,
uio_num is always set. Fix the warning by initializing uio_num to -1,
and by the way, change the type to int.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---

diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
index fa10329fd4..b639ab9383 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
@@ -154,7 +154,7 @@ pci_get_uio_dev(struct rte_pci_device *dev, char *dstbuf,
 			   unsigned int buflen, int create)
 {
 	struct rte_pci_addr *loc = &dev->addr;
-	unsigned int uio_num;
+	int uio_num = -1;
 	struct dirent *e;
 	DIR *dir;
 	char dirname[PATH_MAX];