[PATCH net-next 2/7] net: ipa: synchronize NAPI only for suspend
From: Alex Elder <hidden>
Date: 2021-02-03 15:31:05
Also in:
lkml
Subsystem:
networking drivers, qcom ipa driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Alex Elder, Linus Torvalds
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 <redacted> --- 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