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