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37 lines
1.2 KiB
Diff
37 lines
1.2 KiB
Diff
From 771719120647216a80b45d26a97c6db8fee2ed0b 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 305/726] 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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diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
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index 5a39deabe613..1ce889fdd3aa 100644
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--- a/drivers/net/usb/lan78xx.c
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+++ b/drivers/net/usb/lan78xx.c
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@@ -1440,6 +1440,9 @@ static int lan78xx_link_reset(struct lan78xx_net *dev)
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if (unlikely(ret < 0))
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return ret;
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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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mutex_lock(&phydev->lock);
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phy_read_status(phydev);
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link = phydev->link;
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--
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2.33.1
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