diff options
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/line6/driver.c | 4 | ||||
| -rw-r--r-- | sound/usb/line6/driver.h | 1 |
2 files changed, 5 insertions, 0 deletions
diff --git a/sound/usb/line6/driver.c b/sound/usb/line6/driver.c index 4f096685ed65..86adf87d57f0 100644 --- a/sound/usb/line6/driver.c +++ b/sound/usb/line6/driver.c @@ -550,6 +550,7 @@ static int line6_hwdep_open(struct snd_hwdep *hw, struct file *file) /* NOTE: hwdep layer provides atomicity here */ line6->messages.active = 1; + line6->messages.nonblock = file->f_flags & O_NONBLOCK ? 1 : 0; return 0; } @@ -579,6 +580,9 @@ line6_hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count, while (kfifo_len(&line6->messages.fifo) == 0) { mutex_unlock(&line6->messages.read_lock); + if (line6->messages.nonblock) + return -EAGAIN; + rv = wait_event_interruptible( line6->messages.wait_queue, kfifo_len(&line6->messages.fifo) != 0); diff --git a/sound/usb/line6/driver.h b/sound/usb/line6/driver.h index e5e572ed5f30..1a4e3700c80c 100644 --- a/sound/usb/line6/driver.h +++ b/sound/usb/line6/driver.h @@ -163,6 +163,7 @@ struct usb_line6 { struct mutex read_lock; wait_queue_head_t wait_queue; unsigned int active:1; + unsigned int nonblock:1; STRUCT_KFIFO_REC_2(LINE6_BUFSIZE_LISTEN * LINE6_RAW_MESSAGES_MAXCOUNT) fifo; } messages; |