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Sleep if the avalon buffer is empty and we've requested a read to allow the write thread to take precedence.

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This commit is contained in:
Con Kolivas 2013-06-13 13:59:17 +10:00
parent 0aeb1b5480
commit 9604cbee98
1 changed files with 5 additions and 0 deletions
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5
driver-avalon.c
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@ -241,6 +241,11 @@ static int avalon_read(struct cgpu_info *avalon, unsigned char *buf,
char readbuf[AVALON_READBUF_SIZE]; char readbuf[AVALON_READBUF_SIZE];
int err, amount, ofs = 2, cp; int err, amount, ofs = 2, cp;
/* If the buffer is ready to take more work, yield once in case the
* write thread is waiting to be scheduled. */
if (!avalon_buffer_full(avalon))
nmsleep(40);
err = usb_read_once_timeout(avalon, readbuf, readsize, &amount, timeout, ep); err = usb_read_once_timeout(avalon, readbuf, readsize, &amount, timeout, ep);
applog(LOG_DEBUG, "%s%i: Get avalon read got err %d", applog(LOG_DEBUG, "%s%i: Get avalon read got err %d",
avalon->drv->name, avalon->device_id, err); avalon->drv->name, avalon->device_id, err);