pci: fix check of mknod

In function pci_mknod_uio_dev() in lib/librte_eal/eal/eal_pci_uio.c,
The return value of mknod() is ret, not f got by fopen().
So the value of ret should be checked for mknod().

Fixes: f7f97c16048e ("pci: add option --create-uio-dev to run without hotplug")

Signed-off-by: Wei Dai <wei.dai@intel.com>
Acked-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 1786b75..3e4ffb5 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
@@ -133,7 +133,7 @@ pci_mknod_uio_dev(const char *sysfs_uio_path, unsigned uio_num)
        snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num);
        dev = makedev(major, minor);
        ret = mknod(filename, S_IFCHR | S_IRUSR | S_IWUSR, dev);
-       if (f == NULL) {
+       if (ret != 0) {
                RTE_LOG(ERR, EAL, "%s(): mknod() failed %s\n",
                        __func__, strerror(errno));
                return -1;