diff options
Diffstat (limited to 'drivers/uio/uio.c')
| -rw-r--r-- | drivers/uio/uio.c | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 85644669fbe7..131342280b46 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -569,20 +569,20 @@ static ssize_t uio_read(struct file *filep, char __user *buf, ssize_t retval = 0; s32 event_count; - mutex_lock(&idev->info_lock); - if (!idev->info || !idev->info->irq) - retval = -EIO; - mutex_unlock(&idev->info_lock); - - if (retval) - return retval; - if (count != sizeof(s32)) return -EINVAL; add_wait_queue(&idev->wait, &wait); do { + mutex_lock(&idev->info_lock); + if (!idev->info || !idev->info->irq) { + retval = -EIO; + mutex_unlock(&idev->info_lock); + break; + } + mutex_unlock(&idev->info_lock); + set_current_state(TASK_INTERRUPTIBLE); event_count = atomic_read(&idev->event); @@ -961,6 +961,8 @@ int __uio_register_device(struct module *owner, if (ret) goto err_uio_dev_add_attributes; + info->uio_dev = idev; + if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { /* * Note that we deliberately don't use devm_request_irq @@ -972,11 +974,12 @@ int __uio_register_device(struct module *owner, */ ret = request_irq(info->irq, uio_interrupt, info->irq_flags, info->name, idev); - if (ret) + if (ret) { + info->uio_dev = NULL; goto err_request_irq; + } } - info->uio_dev = idev; return 0; err_request_irq: @@ -1014,6 +1017,9 @@ void uio_unregister_device(struct uio_info *info) idev->info = NULL; mutex_unlock(&idev->info_lock); + wake_up_interruptible(&idev->wait); + kill_fasync(&idev->async_queue, SIGIO, POLL_HUP); + device_unregister(&idev->dev); return; |