net: mhi: Fix unexpected queue wake

This patch checks that MHI queue is not full before waking up the net
queue. This fix sporadic MHI queueing issues in xmit. Indeed xmit and
its symmetric complete callback (ul_callback) can run concurently, it
is then not safe to unconditionnaly waking the queue in the callback
without checking queue fullness.

Fixes: 3ffec6a14f24 ("net: Add mhi-net driver")
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Link: https://lore.kernel.org/r/1607599507-5879-1-git-send-email-loic.poulain@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c
index d3f92781314e0f2254687b18022be71fbdca7e8a..fa41d8c42f05f1dc0ffa437a58ccb705ab518bf2 100644 (file)
--- a/drivers/net/mhi_net.c
+++ b/drivers/net/mhi_net.c
@@ -173,6 +173,7 @@ static void mhi_net_ul_callback(struct mhi_device *mhi_dev,
 {
        struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev);
        struct net_device *ndev = mhi_netdev->ndev;
+       struct mhi_device *mdev = mhi_netdev->mdev;
        struct sk_buff *skb = mhi_res->buf_addr;
 
        /* Hardware has consumed the buffer, so free the skb (which is not
@@ -196,7 +197,7 @@ static void mhi_net_ul_callback(struct mhi_device *mhi_dev,
        }
        u64_stats_update_end(&mhi_netdev->stats.tx_syncp);
 
-       if (netif_queue_stopped(ndev))
+       if (netif_queue_stopped(ndev) && !mhi_queue_is_full(mdev, DMA_TO_DEVICE))
                netif_wake_queue(ndev);
 }