diff options
| -rw-r--r-- | drivers/block/ublk_drv.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index deabcb23ae2a..1f7bbbc3276a 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -125,7 +125,8 @@ struct ublk_device { struct cdev cdev; struct device cdev_dev; - atomic_t ch_open_cnt; +#define UB_STATE_OPEN (1 << 0) + unsigned long state; int ub_number; struct mutex mutex; @@ -647,21 +648,17 @@ static int ublk_ch_open(struct inode *inode, struct file *filp) struct ublk_device *ub = container_of(inode->i_cdev, struct ublk_device, cdev); - if (atomic_cmpxchg(&ub->ch_open_cnt, 0, 1) == 0) { - filp->private_data = ub; - return 0; - } - return -EBUSY; + if (test_and_set_bit(UB_STATE_OPEN, &ub->state)) + return -EBUSY; + filp->private_data = ub; + return 0; } static int ublk_ch_release(struct inode *inode, struct file *filp) { struct ublk_device *ub = filp->private_data; - while (atomic_cmpxchg(&ub->ch_open_cnt, 1, 0) != 1) - cpu_relax(); - - filp->private_data = NULL; + clear_bit(UB_STATE_OPEN, &ub->state); return 0; } |