net: ipa: introduce gsi_channel_stop_retry()

Create a new helper function that encapsulates issuing a set of
channel stop commands, retrying if appropriate, with a short delay
between attempts.
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

@@ -892,15 +892,12 @@ int gsi_channel_start(struct gsi *gsi, u32 channel_id)
 	return ret;
 }
 
-/* Stop a started channel */
-int gsi_channel_stop(struct gsi *gsi, u32 channel_id)
+static int gsi_channel_stop_retry(struct gsi_channel *channel)
 {
-	struct gsi_channel *channel = &gsi->channel[channel_id];
 	u32 retries = GSI_CHANNEL_STOP_RETRIES;
+	struct gsi *gsi = channel->gsi;
 	int ret;
 
-	gsi_channel_freeze(channel);
-
 	mutex_lock(&gsi->mutex);
 
 	do {
@@ -912,6 +909,19 @@ int gsi_channel_stop(struct gsi *gsi, u32 channel_id)
 
 	mutex_unlock(&gsi->mutex);
 
+	return ret;
+}
+
+/* Stop a started channel */
+int gsi_channel_stop(struct gsi *gsi, u32 channel_id)
+{
+	struct gsi_channel *channel = &gsi->channel[channel_id];
+	int ret;
+
+	gsi_channel_freeze(channel);
+
+	ret = gsi_channel_stop_retry(channel);
+
 	/* Re-thaw the channel if an error occurred while stopping */
 	if (ret)
 		gsi_channel_thaw(channel);