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[media] anysee: repeat failed USB control messages 

Control message load increased heavily after CI/CAM support due
to dvb_ca_en50221. It looks like CI/CAM drops to non-working
state easily after error is returned to its callbacks. Due to
that, add some logic to avoid errors repeating failed messages.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antti Palosaari 2012-01-21 11:19:29 -03:00 committed by Mauro Carvalho Chehab
parent 3e9caa5251
commit cf427952ad
1 changed files with 32 additions and 6 deletions
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38
drivers/media/dvb/dvb-usb/anysee.c
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@ -58,7 +58,7 @@ static int anysee_ctrl_msg(struct dvb_usb_device *d, u8 *sbuf, u8 slen,
u8 *rbuf, u8 rlen)
{
struct anysee_state *state = d->priv;
int act_len, ret;
int act_len, ret, i;
u8 buf[64];
memcpy(&buf[0], sbuf, slen);
@ -73,26 +73,52 @@ static int anysee_ctrl_msg(struct dvb_usb_device *d, u8 *sbuf, u8 slen,
/* We need receive one message more after dvb_usb_generic_rw due
to weird transaction flow, which is 1 x send + 2 x receive. */
ret = dvb_usb_generic_rw(d, buf, sizeof(buf), buf, sizeof(buf), 0);
if (!ret) {
if (ret)
goto error_unlock;
/* TODO FIXME: dvb_usb_generic_rw() fails rarely with error code -32
* (EPIPE, Broken pipe). Function supports currently msleep() as a
* parameter but I would not like to use it, since according to
* Documentation/timers/timers-howto.txt it should not be used such
* short, under < 20ms, sleeps. Repeating failed message would be
* better choice as not to add unwanted delays...
* Fixing that correctly is one of those or both;
* 1) use repeat if possible
* 2) add suitable delay
*/
/* get answer, retry few times if error returned */
for (i = 0; i < 3; i++) {
/* receive 2nd answer */
ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev,
d->props.generic_bulk_ctrl_endpoint), buf, sizeof(buf),
&act_len, 2000);
if (ret)
err("%s: recv bulk message failed: %d", __func__, ret);
else {
if (ret) {
deb_info("%s: recv bulk message failed: %d",
__func__, ret);
} else {
deb_xfer("<<< ");
debug_dump(buf, rlen, deb_xfer);
if (buf[63] != 0x4f)
deb_info("%s: cmd failed\n", __func__);
break;
}
}
if (ret) {
/* all retries failed, it is fatal */
err("%s: recv bulk message failed: %d", __func__, ret);
goto error_unlock;
}
/* read request, copy returned data to return buf */
if (!ret && rbuf && rlen)
if (rbuf && rlen)
memcpy(rbuf, buf, rlen);
error_unlock:
mutex_unlock(&anysee_usb_mutex);
return ret;