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

From: Alex Elder <elder@linaro.org>
To: davem@davemloft.net, kuba@kernel.org
Cc: elder@kernel.org, evgreen@chromium.org,
	bjorn.andersson@linaro.org, cpratapa@codeaurora.org,
	subashab@codeaurora.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH net-next v2 2/7] net: ipa: synchronize NAPI only for suspend
Date: Fri,  5 Feb 2021 16:10:55 -0600	[thread overview]
Message-ID: <20210205221100.1738-3-elder@linaro.org> (raw)
In-Reply-To: <20210205221100.1738-1-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>
---
v2: - Return early to avoid blocks of indented code

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

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) */
-- 
2.20.1

