From: Filipe Manana fdmanana@suse.com
[ Upstream commit 2342d6595b608eec94187a17dc112dd4c2a812fa ]
Smatch complains about calling PTR_ERR() against a NULL pointer:
fs/btrfs/super.c:2272 btrfs_control_ioctl() warn: passing zero to 'PTR_ERR'
Fix this by calling PTR_ERR() against the device pointer only if it contains an error.
Reviewed-by: Qu Wenruo wqu@suse.com Signed-off-by: Filipe Manana fdmanana@suse.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/btrfs/super.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index c64d071341223..4505995eec342 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -2256,7 +2256,10 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd, device = btrfs_scan_one_device(vol->name, BLK_OPEN_READ, false); if (IS_ERR_OR_NULL(device)) { mutex_unlock(&uuid_mutex); - ret = PTR_ERR(device); + if (IS_ERR(device)) + ret = PTR_ERR(device); + else + ret = 0; break; } ret = !(device->fs_devices->num_devices ==