net: ipa: don't thaw channel if error starting

If an error occurs starting a channel, don't "thaw" it.
We should assume the channel remains in a non-started state.

Update the comment in gsi_channel_stop(); calls to this function
are no longer retried.
Signed-off-by: Alex Elder <elder@linaro.org>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ipa/gsi.c

@@ -885,7 +885,9 @@ int gsi_channel_start(struct gsi *gsi, u32 channel_id)
 
 	mutex_unlock(&gsi->mutex);
 
-	gsi_channel_thaw(channel);
+	/* Thaw the channel if successful */
+	if (!ret)
+		gsi_channel_thaw(channel);
 
 	return ret;
 }
@@ -910,7 +912,7 @@ int gsi_channel_stop(struct gsi *gsi, u32 channel_id)
 
 	mutex_unlock(&gsi->mutex);
 
-	/* Thaw the channel if we need to retry (or on error) */
+	/* Re-thaw the channel if an error occurred while stopping */
 	if (ret)
 		gsi_channel_thaw(channel);