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[net-next,v2,2/7] net: ipa: synchronize NAPI only for suspend

Message ID 20210205221100.1738-3-elder@linaro.org
State New
Headers show
Series net: ipa: a mix of small improvements | expand

Commit Message

Alex Elder Feb. 5, 2021, 10:10 p.m. UTC 
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>

---
v2: - Return early to avoid blocks of indented code

 drivers/net/ipa/gsi.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

-- 
2.20.1
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Patch

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index f0432c965168c..60eb765c53647 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -939,13 +939,7 @@  static int __gsi_channel_stop(struct gsi_channel *channel, bool stop)
 
 	mutex_unlock(&gsi->mutex);
 
-	if (ret)
-		return ret;
-
-	/* Ensure NAPI polling has finished. */
-	napi_synchronize(&channel->napi);
-
-	return 0;
+	return ret;
 }
 
 /* Stop a started channel */
@@ -987,8 +981,16 @@  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);
+	ret = __gsi_channel_stop(channel, stop);
+	if (ret)
+		return ret;
+
+	/* Ensure NAPI polling has finished. */
+	napi_synchronize(&channel->napi);
+
+	return 0;
 }
 
 /* Resume a suspended channel (starting will be requested if STOPPED) */