diff options
Diffstat (limited to 'drivers/usb/class/cdc-acm.c')
-rw-r--r-- | drivers/usb/class/cdc-acm.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 6836177..3e15add 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -360,7 +360,7 @@ static void acm_ctrl_irq(struct urb *urb) } exit: retval = usb_submit_urb(urb, GFP_ATOMIC); - if (retval) + if (retval && retval != -EPERM) dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n", __func__, retval); } @@ -417,25 +417,33 @@ static void acm_read_bulk_callback(struct urb *urb) struct acm_rb *rb = urb->context; struct acm *acm = rb->instance; unsigned long flags; + int status = urb->status; dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__, rb->index, urb->actual_length); - set_bit(rb->index, &acm->read_urbs_free); if (!acm->dev) { + set_bit(rb->index, &acm->read_urbs_free); dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__); return; } - if (urb->status) { + if (status) { + set_bit(rb->index, &acm->read_urbs_free); dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n", - __func__, urb->status); + __func__, status); return; } usb_mark_last_busy(acm->dev); acm_process_read_urb(acm, urb); + /* + * Unthrottle may run on another CPU which needs to see events + * in the same order. Submission has an implict barrier + */ + smp_mb__before_atomic(); + set_bit(rb->index, &acm->read_urbs_free); /* throttle device if requested by tty */ spin_lock_irqsave(&acm->read_lock, flags); @@ -454,13 +462,14 @@ static void acm_write_bulk(struct urb *urb) struct acm_wb *wb = urb->context; struct acm *acm = wb->instance; unsigned long flags; + int status = urb->status; - if (urb->status || (urb->actual_length != urb->transfer_buffer_length)) + if (status || (urb->actual_length != urb->transfer_buffer_length)) dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n", __func__, urb->actual_length, urb->transfer_buffer_length, - urb->status); + status); spin_lock_irqsave(&acm->write_lock, flags); acm_write_done(acm, wb); |