diff options
Diffstat (limited to 'sound/usb/endpoint.c')
-rw-r--r-- | sound/usb/endpoint.c | 62 |
1 files changed, 31 insertions, 31 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index 7f78c6d..21049b8 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -35,6 +35,7 @@ #define EP_FLAG_ACTIVATED 0 #define EP_FLAG_RUNNING 1 +#define EP_FLAG_STOPPING 2 /* * snd_usb_endpoint is a model that abstracts everything related to an @@ -484,15 +485,10 @@ __exit_unlock: static int wait_clear_urbs(struct snd_usb_endpoint *ep) { unsigned long end_time = jiffies + msecs_to_jiffies(1000); - unsigned int i; int alive; do { - alive = 0; - for (i = 0; i < ep->nurbs; i++) - if (test_bit(i, &ep->active_mask)) - alive++; - + alive = bitmap_weight(&ep->active_mask, ep->nurbs); if (!alive) break; @@ -502,40 +498,41 @@ static int wait_clear_urbs(struct snd_usb_endpoint *ep) if (alive) snd_printk(KERN_ERR "timeout: still %d active urbs on EP #%x\n", alive, ep->ep_num); + clear_bit(EP_FLAG_STOPPING, &ep->flags); return 0; } +/* sync the pending stop operation; + * this function itself doesn't trigger the stop operation + */ +void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep) +{ + if (ep && test_bit(EP_FLAG_STOPPING, &ep->flags)) + wait_clear_urbs(ep); +} + /* * unlink active urbs. */ -static int deactivate_urbs(struct snd_usb_endpoint *ep, int force, int can_sleep) +static int deactivate_urbs(struct snd_usb_endpoint *ep, bool force) { unsigned int i; - int async; if (!force && ep->chip->shutdown) /* to be sure... */ return -EBADFD; - async = !can_sleep && ep->chip->async_unlink; - clear_bit(EP_FLAG_RUNNING, &ep->flags); INIT_LIST_HEAD(&ep->ready_playback_urbs); ep->next_packet_read_pos = 0; ep->next_packet_write_pos = 0; - if (!async && in_interrupt()) - return 0; - for (i = 0; i < ep->nurbs; i++) { if (test_bit(i, &ep->active_mask)) { if (!test_and_set_bit(i, &ep->unlink_mask)) { struct urb *u = ep->urb[i].urb; - if (async) - usb_unlink_urb(u); - else - usb_kill_urb(u); + usb_unlink_urb(u); } } } @@ -555,7 +552,7 @@ static void release_urbs(struct snd_usb_endpoint *ep, int force) ep->prepare_data_urb = NULL; /* stop urbs */ - deactivate_urbs(ep, force, 1); + deactivate_urbs(ep, force); wait_clear_urbs(ep); for (i = 0; i < ep->nurbs; i++) @@ -818,7 +815,7 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep, * * Returns an error if the URB submission failed, 0 in all other cases. */ -int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, int can_sleep) +int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, bool can_sleep) { int err; unsigned int i; @@ -831,7 +828,7 @@ int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, int can_sleep) return 0; /* just to be sure */ - deactivate_urbs(ep, 0, can_sleep); + deactivate_urbs(ep, false); if (can_sleep) wait_clear_urbs(ep); @@ -885,7 +882,7 @@ int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, int can_sleep) __error: clear_bit(EP_FLAG_RUNNING, &ep->flags); ep->use_count--; - deactivate_urbs(ep, 0, 0); + deactivate_urbs(ep, false); return -EPIPE; } @@ -899,9 +896,11 @@ __error: * actually be deactivated. * * Must be balanced to calls of snd_usb_endpoint_start(). + * + * The caller needs to synchronize the pending stop operation via + * snd_usb_endpoint_sync_pending_stop(). */ -void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, - int force, int can_sleep, int wait) +void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep) { if (!ep) return; @@ -910,14 +909,12 @@ void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, return; if (--ep->use_count == 0) { - deactivate_urbs(ep, force, can_sleep); + deactivate_urbs(ep, false); ep->data_subs = NULL; ep->sync_slave = NULL; ep->retire_data_urb = NULL; ep->prepare_data_urb = NULL; - - if (wait) - wait_clear_urbs(ep); + set_bit(EP_FLAG_STOPPING, &ep->flags); } } @@ -939,7 +936,7 @@ int snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep) if (!ep) return -EINVAL; - deactivate_urbs(ep, 1, 1); + deactivate_urbs(ep, true); wait_clear_urbs(ep); if (ep->use_count != 0) @@ -1021,15 +1018,18 @@ void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep, /* * Iterate through the inbound packet and prepare the lengths * for the output packet. The OUT packet we are about to send - * will have the same amount of payload bytes than the IN - * packet we just received. + * will have the same amount of payload bytes per stride as the + * IN packet we just received. Since the actual size is scaled + * by the stride, use the sender stride to calculate the length + * in case the number of channels differ between the implicitly + * fed-back endpoint and the synchronizing endpoint. */ out_packet->packets = in_ctx->packets; for (i = 0; i < in_ctx->packets; i++) { if (urb->iso_frame_desc[i].status == 0) out_packet->packet_size[i] = - urb->iso_frame_desc[i].actual_length / ep->stride; + urb->iso_frame_desc[i].actual_length / sender->stride; else out_packet->packet_size[i] = 0; } |