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btrfs: zoned: fix uninitialized variable warning in btrfs_get_dev_zones

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Fix an uninitialized warning we get with -Wmaybe-uninitialized where it
thought zno may have been uninitialized, in both cases it depends on
zinfo->zone_cache but we know the value won't change between checks.

Reported-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/linux-btrfs/af6c527cbd8bdc782e50bd33996ee83acc3a16fb.1671221596.git.josef@toxicpanda.com/
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Naohiro Aota 2022-12-21 16:47:45 +00:00 committed by David Sterba
parent 12adffe6cf
commit cd30d3bc78
1 changed files with 5 additions and 2 deletions
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7
fs/btrfs/zoned.c
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@ -220,7 +220,6 @@ static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
struct blk_zone *zones, unsigned int *nr_zones)
{
struct btrfs_zoned_device_info *zinfo = device->zone_info;
u32 zno;
int ret;
if (!*nr_zones)
@ -235,6 +234,7 @@ static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
/* Check cache */
if (zinfo->zone_cache) {
unsigned int i;
u32 zno;
ASSERT(IS_ALIGNED(pos, zinfo->zone_size));
zno = pos >> zinfo->zone_size_shift;
@ -274,9 +274,12 @@ static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
return -EIO;
/* Populate cache */
if (zinfo->zone_cache)
if (zinfo->zone_cache) {
u32 zno = pos >> zinfo->zone_size_shift;
memcpy(zinfo->zone_cache + zno, zones,
sizeof(*zinfo->zone_cache) * *nr_zones);
}
return 0;
}