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net: ipa: fix a bug in ipa_endpoint_stop()

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In ipa_endpoint_stop(), for TX endpoints we set the number of retries
to 0.  When we break out of the loop, retries being 0 means we return
EIO rather than the value of ret (which should be 0).

Fix this by using a non-zero retry count for both RX and TX
channels, and just break out of the loop after calling
gsi_channel_stop() for TX channels.  This way only RX channels
will retry, and the retry count will be non-zero at the end
for TX channels (so the proper value gets returned).

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 713b6ebb4c)
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Elder 2020-05-04 18:53:41 -05:00 committed by David S. Miller
parent 6a5dc76ac4
commit 97e4692dda
1 changed files with 2 additions and 5 deletions
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7
drivers/net/ipa/ipa_endpoint.c
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@ -1311,7 +1311,7 @@ static int ipa_endpoint_stop_rx_dma(struct ipa *ipa)
*/
int ipa_endpoint_stop(struct ipa_endpoint *endpoint)
{
u32 retries = endpoint->toward_ipa ? 0 : IPA_ENDPOINT_STOP_RX_RETRIES;
u32 retries = IPA_ENDPOINT_STOP_RX_RETRIES;
int ret;
do {
@ -1319,12 +1319,9 @@ int ipa_endpoint_stop(struct ipa_endpoint *endpoint)
struct gsi *gsi = &ipa->gsi;
ret = gsi_channel_stop(gsi, endpoint->channel_id);
if (ret != -EAGAIN)
if (ret != -EAGAIN || endpoint->toward_ipa)
break;
if (endpoint->toward_ipa)
continue;
/* For IPA v3.5.1, send a DMA read task and check again */
if (ipa->version == IPA_VERSION_3_5_1) {
ret = ipa_endpoint_stop_rx_dma(ipa);