[PATCH 16/16] loop: Get rid of 'nested' acquisition of loop_ctl_mutex

Jan Kara
2018-11-08T22:36:46Z

The nested acquisition of loop_ctl_mutex (->lo_ctl_mutex back then) has
been introduced by commit f028f3b2f987e "loop: fix circular locking in
loop_clr_fd()" to fix lockdep complains about bd_mutex being acquired
after lo_ctl_mutex during partition rereading. Now that these are
properly fixed, let's stop fooling lockdep.

Signed-off-by: Jan Kara <jack@suse.cz>
---
drivers/block/loop.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 112afc9bc604..bf6bc35aaf88 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -681,7 +681,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
int error;
bool partscan;

- error = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
+ error = mutex_lock_killable(&loop_ctl_mutex);
if (error)
return error;
error = -ENXIO;
@@ -919,7 +919,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
if (!file)
goto out;

- error = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
+ error = mutex_lock_killable(&loop_ctl_mutex);
if (error)
goto out_putf;

@@ -1135,7 +1135,7 @@ static int loop_clr_fd(struct loop_device *lo)
{
int err;

- err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
+ err = mutex_lock_killable(&loop_ctl_mutex);
if (err)
return err;
if (lo->lo_state != Lo_bound) {
@@ -1172,7 +1172,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
struct block_device *bdev;
bool partscan = false;

- err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
+ err = mutex_lock_killable(&loop_ctl_mutex);
if (err)
return err;
if (lo->lo_encrypt_key_size &&
@@ -1277,7 +1277,7 @@ loop_get_status(struct loop_device *lo, struct loop_info64 *info)
struct kstat stat;
int ret;

- ret = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
+ ret = mutex_lock_killable(&loop_ctl_mutex);
if (ret)
return ret;
if (lo->lo_state != Lo_bound) {
@@ -1466,7 +1466,7 @@ static int lo_simple_ioctl(struct loop_device *lo, unsigned int cmd,
{
int err;

- err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
+ err = mutex_lock_killable(&loop_ctl_mutex);
if (err)
return err;
switch (cmd) {
--
2.16.4