diff options
| -rw-r--r-- | drivers/usb/usb-skeleton.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c index 768fda9..ef8c877 100644 --- a/drivers/usb/usb-skeleton.c +++ b/drivers/usb/usb-skeleton.c @@ -268,6 +268,11 @@ retry: spin_unlock_irq(&dev->err_lock); if (ongoing_io) { + /* nonblocking IO shall not wait */ + if (file->f_flags & O_NONBLOCK) { + rv = -EAGAIN; + goto exit; + } /* * IO may take forever * hence wait in an interruptible state @@ -351,8 +356,9 @@ retry: rv = skel_do_read_io(dev, count); if (rv < 0) goto exit; - else + else if (!file->f_flags & O_NONBLOCK) goto retry; + rv = -EAGAIN; } exit: mutex_unlock(&dev->io_mutex); |