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cdc device: claim endpoint before checking fifo availability

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- add pre-check to reduce mutex lock in usbd_edpt_claim
This commit is contained in:
hathach
2020-09-14 22:14:31 +07:00
parent 1804dba615
commit 23e6ee2ea2
2 changed files with 23 additions and 7 deletions
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src/device/usbd.c
+4 -1
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@@ -1100,11 +1100,14 @@ bool usbd_edpt_claim(uint8_t rhport, uint8_t ep_addr)
uint8_t const dir = tu_edpt_dir(ep_addr);
#if CFG_TUSB_OS != OPT_OS_NONE
// pre-check to help reducing mutex lock
TU_VERIFY((_usbd_dev.ep_status[epnum][dir].busy == 0) && (_usbd_dev.ep_status[epnum][dir].claimed == 0));
osal_mutex_lock(_usbd_mutex, OSAL_TIMEOUT_WAIT_FOREVER);
#endif
// can only claim the endpoint if it is not busy and not claimed yet.
bool ret = (_usbd_dev.ep_status[epnum][dir].busy == 0) && (_usbd_dev.ep_status[epnum][dir].claimed == 0);
bool const ret = (_usbd_dev.ep_status[epnum][dir].busy == 0) && (_usbd_dev.ep_status[epnum][dir].claimed == 0);
if (ret)
{
_usbd_dev.ep_status[epnum][dir].claimed = 1;