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Add usb transfer cancellation on shutdown and documentation regarding where cancellable transfers are suitable.

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This commit is contained in:
Con Kolivas 2013-10-25 04:07:09 +11:00
parent eb5b611483
commit 9d8e3df0a8
2 changed files with 10 additions and 0 deletions
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6
cgminer.c
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@ -3931,6 +3931,9 @@ static void restart_threads(void)
mutex_unlock(&restart_lock); mutex_unlock(&restart_lock);
#ifdef USE_USBUTILS #ifdef USE_USBUTILS
/* Cancels any cancellable usb transfers. Flagged as such it means they
* are usualy waiting on a read result and it's safe to abort the read
* early. */
cancel_usb_transfers(); cancel_usb_transfers();
#endif #endif
} }
@ -7814,6 +7817,9 @@ static void *libusb_poll_thread(void __maybe_unused *arg)
while (usb_polling) while (usb_polling)
libusb_handle_events_timeout_completed(NULL, &tv_end, NULL); libusb_handle_events_timeout_completed(NULL, &tv_end, NULL);
/* Cancel any cancellable usb transfers */
cancel_usb_transfers();
/* Keep event handling going until there are no async transfers in /* Keep event handling going until there are no async transfers in
* flight. */ * flight. */
do { do {

4
usbutils.c
View File

@ -2217,6 +2217,10 @@ struct usb_transfer {
struct list_head list; struct list_head list;
}; };
/* Cancellable transfers should only be labelled as such if it is safe for them
* to effectively mimic timing out early. This flag is usually used to signify
* a read is waiting on a non-critical response that takes a long time and the
* driver wishes it be aborted if work restart message has been sent. */
void cancel_usb_transfers(void) void cancel_usb_transfers(void)
{ {
struct usb_transfer *ut; struct usb_transfer *ut;