diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-1031-net-lan78xx-Ack-pending-PHY-ints-when-resetting.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-1031-net-lan78xx-Ack-pending-PHY-ints-when-resetting.patch | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-1031-net-lan78xx-Ack-pending-PHY-ints-when-resetting.patch b/target/linux/bcm27xx/patches-5.4/950-1031-net-lan78xx-Ack-pending-PHY-ints-when-resetting.patch new file mode 100644 index 0000000000..2dc2a13cb7 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-1031-net-lan78xx-Ack-pending-PHY-ints-when-resetting.patch @@ -0,0 +1,32 @@ +From 598d6389f41c1e01b70df7d8b1056c3839e0c1c2 Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.com> +Date: Tue, 15 Dec 2020 16:38:37 +0000 +Subject: [PATCH] net: lan78xx: Ack pending PHY ints when resetting + +lan78xx_link_reset explicitly clears the MAC's view of the PHY's IRQ +status. In doing so it potentially leaves the PHY with a pending +interrupt that will never be acknowledged, at which point no further +interrupts will be generated. + +Avoid the problem by acknowledging any pending PHY interrupt after +clearing the MAC's status bit. + +See: https://github.com/raspberrypi/linux/issues/2937 + +Signed-off-by: Phil Elwell <phil@raspberrypi.com> +--- + drivers/net/usb/lan78xx.c | 3 +++ + 1 file changed, 3 insertions(+) + +--- a/drivers/net/usb/lan78xx.c ++++ b/drivers/net/usb/lan78xx.c +@@ -1181,6 +1181,9 @@ static int lan78xx_link_reset(struct lan + if (unlikely(ret < 0)) + return -EIO; + ++ /* Acknowledge any pending PHY interrupt, lest it be the last */ ++ phy_read(phydev, LAN88XX_INT_STS); ++ + phy_read_status(phydev); + + if (!phydev->link && dev->link_on) { |