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| author | Arnd Bergmann <arnd@arndb.de> | 2016-10-24 18:28:35 +0300 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2017-02-09 01:13:05 +0300 |
| commit | e70dda0868fad0f74c46df21f7f45fec24f29879 (patch) | |
| tree | 76091ac56597c5039b40718e451d79ab624e3a65 /drivers/mtd/maps/ichxrom.c | |
| parent | 6080ef6e7c0a0592cbcca11200d879faf65e27d4 (diff) | |
| download | linux-e70dda0868fad0f74c46df21f7f45fec24f29879.tar.xz | |
mtd: ichxrom: maybe-uninitialized with gcc-4.9
pci_read_config_word() might fail and not initialize its output,
as pointed out by older versions of gcc when using the -Wmaybe-unintialized
flag:
drivers/mtd/maps/ichxrom.c: In function ‘ichxrom_cleanup’:
drivers/mtd/maps/ichxrom.c:63:2: error: ‘word’ is used uninitialized in this function [-Werror=uninitialized]
This is apparently a correct warning, though it does not show up
with newer compilers. Changing the code to not attempt to write
back uninitialized data into PCI config space is a correct
fix for the problem and avoids the warning.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd/maps/ichxrom.c')
| -rw-r--r-- | drivers/mtd/maps/ichxrom.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/mtd/maps/ichxrom.c b/drivers/mtd/maps/ichxrom.c index e17d02ae03f0..976d42f63aef 100644 --- a/drivers/mtd/maps/ichxrom.c +++ b/drivers/mtd/maps/ichxrom.c @@ -57,10 +57,12 @@ static void ichxrom_cleanup(struct ichxrom_window *window) { struct ichxrom_map_info *map, *scratch; u16 word; + int ret; /* Disable writes through the rom window */ - pci_read_config_word(window->pdev, BIOS_CNTL, &word); - pci_write_config_word(window->pdev, BIOS_CNTL, word & ~1); + ret = pci_read_config_word(window->pdev, BIOS_CNTL, &word); + if (!ret) + pci_write_config_word(window->pdev, BIOS_CNTL, word & ~1); pci_dev_put(window->pdev); /* Free all of the mtd devices */ |