linux-kernel - [PATCH 4.14 235/246] net: lan78xx: fix rx handling before first packet is send

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Date:   Wed,  1 Aug 2018 18:52:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Floris Bos <bos@...eigen-domein.nl>,
        Stefan Wahren <stefan.wahren@...e.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.14 235/246] net: lan78xx: fix rx handling before first packet is send

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefan Wahren <stefan.wahren@...e.com>

[ Upstream commit 136f55f660192ce04af091642efc75d85e017364 ]

As long the bh tasklet isn't scheduled once, no packet from the rx path
will be handled. Since the tx path also schedule the same tasklet
this situation only persits until the first packet transmission.
So fix this issue by scheduling the tasklet after link reset.

Link: https://github.com/raspberrypi/linux/issues/2617
Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet")
Suggested-by: Floris Bos <bos@...eigen-domein.nl>
Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/usb/lan78xx.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -1216,6 +1216,8 @@ static int lan78xx_link_reset(struct lan
 			mod_timer(&dev->stat_monitor,
 				  jiffies + STAT_UPDATE_TIMER);
 		}
+
+		tasklet_schedule(&dev->bh);
 	}
 
 	return ret;