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Close a minor deadlock.

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MFC after:	1 week
This commit is contained in:
Hans Petter Selasky 2014-01-17 08:21:09 +00:00
parent 0cfea1c8fc
commit c7d8c1c6e0
1 changed files with 7 additions and 0 deletions
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7
sys/dev/usb/usb_dev.c
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@ -597,6 +597,13 @@ usb_fifo_free(struct usb_fifo *f)
mtx_unlock(f->priv_mtx);
mtx_lock(&usb_ref_lock);
/*
* Check if the "f->refcount" variable reached zero
* during the unlocked time before entering wait:
*/
if (f->refcount == 0)
break;
/* wait for sync */
cv_wait(&f->cv_drain, &usb_ref_lock);
}