[PATCH net-next 2/7] net: ipa: synchronize NAPI only for suspend

[Alex Elder <elder@linaro.org>]

When stopping a channel, gsi_channel_stop() will ensure NAPI
polling is complete when it calls napi_disable().  So there is no
need to call napi_synchronize() in that case.

Move the call to napi_synchronize() out of __gsi_channel_stop()
and into gsi_channel_suspend(), so it's only used where needed.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/gsi.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 2671b76ebcfe3..420d0f3bfae9a 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -939,10 +939,6 @@ static int __gsi_channel_stop(struct gsi_channel *channel, bool stop)
 		mutex_unlock(&gsi->mutex);
 	}
 
-	/* Finally, ensure NAPI polling has finished. */
-	if (!ret)
-		napi_synchronize(&channel->napi);
-
 	return ret;
 }
 
@@ -984,8 +980,14 @@ void gsi_channel_reset(struct gsi *gsi, u32 channel_id, bool doorbell)
 int gsi_channel_suspend(struct gsi *gsi, u32 channel_id, bool stop)
 {
 	struct gsi_channel *channel = &gsi->channel[channel_id];
+	int ret;
 
-	return __gsi_channel_stop(channel, stop);
+	/* Synchronize NAPI if successful, to ensure polling has finished. */
+	ret = __gsi_channel_stop(channel, stop);
+	if (!ret)
+		napi_synchronize(&channel->napi);
+
+	return ret;
 }
 
 /* Resume a suspended channel (starting will be requested if STOPPED) */
-- 
2.20.1