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| author | Jan Kara <jack@suse.cz> | 2018-11-08 14:01:08 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-11-08 06:30:20 -0700 |
| commit | 4a5ce9ba5877e4640200d84a735361306ad1a1b8 (patch) | |
| tree | 0f5cb70f33f69c89beea42be3bbf3c121fa31cff /drivers/block/loop.c | |
| parent | 7ccd0791d98531df7cd59e92d55e4f063d48a070 (diff) | |
| download | lwn-4a5ce9ba5877e4640200d84a735361306ad1a1b8.tar.gz lwn-4a5ce9ba5877e4640200d84a735361306ad1a1b8.zip | |
loop: Push loop_ctl_mutex down to loop_get_status()
Push loop_ctl_mutex down to loop_get_status() to avoid the unusual
convention that the function gets called with loop_ctl_mutex held and
releases it.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/loop.c')
| -rw-r--r-- | drivers/block/loop.c | 37 |
1 files changed, 10 insertions, 27 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index d8a7b5da881b..2e814f8af4df 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1232,6 +1232,9 @@ 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); + if (ret) + return ret; if (lo->lo_state != Lo_bound) { mutex_unlock(&loop_ctl_mutex); return -ENXIO; @@ -1346,10 +1349,8 @@ loop_get_status_old(struct loop_device *lo, struct loop_info __user *arg) { struct loop_info64 info64; int err; - if (!arg) { - mutex_unlock(&loop_ctl_mutex); + if (!arg) return -EINVAL; - } err = loop_get_status(lo, &info64); if (!err) err = loop_info64_to_old(&info64, &info); @@ -1364,10 +1365,8 @@ loop_get_status64(struct loop_device *lo, struct loop_info64 __user *arg) { struct loop_info64 info64; int err; - if (!arg) { - mutex_unlock(&loop_ctl_mutex); + if (!arg) return -EINVAL; - } err = loop_get_status(lo, &info64); if (!err && copy_to_user(arg, &info64, sizeof(info64))) err = -EFAULT; @@ -1477,12 +1476,7 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode, } break; case LOOP_GET_STATUS: - err = mutex_lock_killable_nested(&loop_ctl_mutex, 1); - if (err) - return err; - err = loop_get_status_old(lo, (struct loop_info __user *) arg); - /* loop_get_status() unlocks loop_ctl_mutex */ - break; + return loop_get_status_old(lo, (struct loop_info __user *) arg); case LOOP_SET_STATUS64: err = -EPERM; if ((mode & FMODE_WRITE) || capable(CAP_SYS_ADMIN)) { @@ -1495,12 +1489,7 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode, } break; case LOOP_GET_STATUS64: - err = mutex_lock_killable_nested(&loop_ctl_mutex, 1); - if (err) - return err; - err = loop_get_status64(lo, (struct loop_info64 __user *) arg); - /* loop_get_status() unlocks loop_ctl_mutex */ - break; + return loop_get_status64(lo, (struct loop_info64 __user *) arg); case LOOP_SET_CAPACITY: case LOOP_SET_DIRECT_IO: case LOOP_SET_BLOCK_SIZE: @@ -1625,10 +1614,8 @@ loop_get_status_compat(struct loop_device *lo, struct loop_info64 info64; int err; - if (!arg) { - mutex_unlock(&loop_ctl_mutex); + if (!arg) return -EINVAL; - } err = loop_get_status(lo, &info64); if (!err) err = loop_info64_to_compat(&info64, arg); @@ -1651,12 +1638,8 @@ static int lo_compat_ioctl(struct block_device *bdev, fmode_t mode, } break; case LOOP_GET_STATUS: - err = mutex_lock_killable(&loop_ctl_mutex); - if (!err) { - err = loop_get_status_compat(lo, - (struct compat_loop_info __user *)arg); - /* loop_get_status() unlocks loop_ctl_mutex */ - } + err = loop_get_status_compat(lo, + (struct compat_loop_info __user *)arg); break; case LOOP_SET_CAPACITY: case LOOP_CLR_FD: |