diff options
| -rw-r--r-- | sound/usb/usbmidi.c | 77 |
1 files changed, 64 insertions, 13 deletions
diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c index 5f19b494923e..93dedde3c428 100644 --- a/sound/usb/usbmidi.c +++ b/sound/usb/usbmidi.c @@ -44,6 +44,7 @@ #include <linux/string.h> #include <linux/init.h> #include <linux/slab.h> +#include <linux/timer.h> #include <linux/usb.h> #include <sound/core.h> #include <sound/minors.h> @@ -56,6 +57,12 @@ */ /* #define DUMP_PACKETS */ +/* + * how long to wait after some USB errors, so that khubd can disconnect() us + * without too many spurious errors + */ +#define ERROR_DELAY_JIFFIES (HZ / 10) + MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>"); MODULE_DESCRIPTION("USB Audio/MIDI helper module"); @@ -100,6 +107,7 @@ struct snd_usb_midi { snd_rawmidi_t* rmidi; struct usb_protocol_ops* usb_protocol_ops; struct list_head list; + struct timer_list error_timer; struct snd_usb_midi_endpoint { snd_usb_midi_out_endpoint_t *out; @@ -141,7 +149,8 @@ struct snd_usb_midi_in_endpoint { struct usbmidi_in_port { snd_rawmidi_substream_t* substream; } ports[0x10]; - int seen_f5; + u8 seen_f5; + u8 error_resubmit; int current_port; }; @@ -167,14 +176,22 @@ static int snd_usbmidi_submit_urb(struct urb* urb, int flags) */ static int snd_usbmidi_urb_error(int status) { - if (status == -ENOENT) - return status; /* killed */ - if (status == -EILSEQ || - status == -ECONNRESET || - status == -ETIMEDOUT) - return -ENODEV; /* device removed/shutdown */ - snd_printk(KERN_ERR "urb status %d\n", status); - return 0; /* continue */ + switch (status) { + /* manually unlinked, or device gone */ + case -ENOENT: + case -ECONNRESET: + case -ESHUTDOWN: + case -ENODEV: + return -ENODEV; + /* errors that might occur during unplugging */ + case -EPROTO: /* EHCI */ + case -ETIMEDOUT: /* OHCI */ + case -EILSEQ: /* UHCI */ + return -EIO; + default: + snd_printk(KERN_ERR "urb status %d\n", status); + return 0; /* continue */ + } } /* @@ -218,8 +235,15 @@ static void snd_usbmidi_in_urb_complete(struct urb* urb, struct pt_regs *regs) ep->umidi->usb_protocol_ops->input(ep, urb->transfer_buffer, urb->actual_length); } else { - if (snd_usbmidi_urb_error(urb->status) < 0) + int err = snd_usbmidi_urb_error(urb->status); + if (err < 0) { + if (err != -ENODEV) { + ep->error_resubmit = 1; + mod_timer(&ep->umidi->error_timer, + jiffies + ERROR_DELAY_JIFFIES); + } return; + } } if (usb_pipe_needs_resubmit(urb->pipe)) { @@ -236,8 +260,13 @@ static void snd_usbmidi_out_urb_complete(struct urb* urb, struct pt_regs *regs) ep->urb_active = 0; spin_unlock(&ep->buffer_lock); if (urb->status < 0) { - if (snd_usbmidi_urb_error(urb->status) < 0) + int err = snd_usbmidi_urb_error(urb->status); + if (err < 0) { + if (err != -ENODEV) + mod_timer(&ep->umidi->error_timer, + jiffies + ERROR_DELAY_JIFFIES); return; + } } snd_usbmidi_do_output(ep); } @@ -276,6 +305,24 @@ static void snd_usbmidi_out_tasklet(unsigned long data) snd_usbmidi_do_output(ep); } +/* called after transfers had been interrupted due to some USB error */ +static void snd_usbmidi_error_timer(unsigned long data) +{ + snd_usb_midi_t *umidi = (snd_usb_midi_t *)data; + int i; + + for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) { + snd_usb_midi_in_endpoint_t *in = umidi->endpoints[i].in; + if (in && in->error_resubmit) { + in->error_resubmit = 0; + in->urb->dev = umidi->chip->dev; + snd_usbmidi_submit_urb(in->urb, GFP_ATOMIC); + } + if (umidi->endpoints[i].out) + snd_usbmidi_do_output(umidi->endpoints[i].out); + } +} + /* helper function to send static data that may not DMA-able */ static int send_bulk_static_data(snd_usb_midi_out_endpoint_t* ep, const void *data, int len) @@ -844,8 +891,6 @@ static unsigned int snd_usbmidi_count_bits(unsigned int x) */ static void snd_usbmidi_out_endpoint_delete(snd_usb_midi_out_endpoint_t* ep) { - if (ep->tasklet.func) - tasklet_kill(&ep->tasklet); if (ep->urb) { usb_buffer_free(ep->umidi->chip->dev, ep->max_transfer, ep->urb->transfer_buffer, @@ -934,8 +979,11 @@ void snd_usbmidi_disconnect(struct list_head* p) int i; umidi = list_entry(p, snd_usb_midi_t, list); + del_timer_sync(&umidi->error_timer); for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) { snd_usb_midi_endpoint_t* ep = &umidi->endpoints[i]; + if (ep->out) + tasklet_kill(&ep->out->tasklet); if (ep->out && ep->out->urb) { usb_kill_urb(ep->out->urb); if (umidi->usb_protocol_ops->finish_out_endpoint) @@ -1496,6 +1544,9 @@ int snd_usb_create_midi_interface(snd_usb_audio_t* chip, umidi->iface = iface; umidi->quirk = quirk; umidi->usb_protocol_ops = &snd_usbmidi_standard_ops; + init_timer(&umidi->error_timer); + umidi->error_timer.function = snd_usbmidi_error_timer; + umidi->error_timer.data = (unsigned long)umidi; /* detect the endpoint(s) to use */ memset(endpoints, 0, sizeof(endpoints)); |