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btrfs: remove impossible WARN_ON in btrfs_destroy_dev_replace_tgtdev()

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We have a user report, that cppcheck is complaining about a possible
NULL-pointer dereference in btrfs_destroy_dev_replace_tgtdev().

We're first dereferencing the 'tgtdev' variable and the later check for
the validity of the pointer with a WARN_ON(!tgtdev);

But all callers of btrfs_destroy_dev_replace_tgtdev() either explicitly
check if 'tgtdev' is non-NULL or directly allocate 'tgtdev', so the
WARN_ON() is impossible to hit. Just remove it to silence the checker's
complains.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=205003
Signed-off-by: Johannes Thumshirn <jth@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2019-12-05 14:19:59 +01:00 committed by David Sterba
parent 1296995225
commit b38f4cbd65
1 changed files with 0 additions and 1 deletions
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fs/btrfs/volumes.c
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@ -2132,7 +2132,6 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev)
{ {
struct btrfs_fs_devices *fs_devices = tgtdev->fs_info->fs_devices; struct btrfs_fs_devices *fs_devices = tgtdev->fs_info->fs_devices;
WARN_ON(!tgtdev);
mutex_lock(&fs_devices->device_list_mutex); mutex_lock(&fs_devices->device_list_mutex);
btrfs_sysfs_rm_device_link(fs_devices, tgtdev); btrfs_sysfs_rm_device_link(fs_devices, tgtdev);