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36 lines
1.3 KiB
Diff
36 lines
1.3 KiB
Diff
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From 8e515a39805c013229698e1a142e16701f07edf9 Mon Sep 17 00:00:00 2001
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From: Alex Marginean <alexandru.marginean@nxp.com>
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Date: Tue, 7 Jan 2020 16:50:31 +0200
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Subject: [PATCH] drivers: net: phy: don't crash in phy_read/_write_mmd without
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a PHY driver
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The APIs can be used by Ethernet drivers to configure internal PHYs
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without actually loading a PHY driver. Check that drv is not NULL before
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reading from it.
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Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
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---
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drivers/net/phy/phy-core.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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--- a/drivers/net/phy/phy-core.c
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+++ b/drivers/net/phy/phy-core.c
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@@ -379,7 +379,7 @@ int __phy_read_mmd(struct phy_device *ph
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if (regnum > (u16)~0 || devad > 32)
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return -EINVAL;
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- if (phydev->drv->read_mmd) {
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+ if (phydev->drv && phydev->drv->read_mmd) {
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val = phydev->drv->read_mmd(phydev, devad, regnum);
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} else if (phydev->is_c45) {
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u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
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@@ -436,7 +436,7 @@ int __phy_write_mmd(struct phy_device *p
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if (regnum > (u16)~0 || devad > 32)
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return -EINVAL;
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- if (phydev->drv->write_mmd) {
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+ if (phydev->drv && phydev->drv->write_mmd) {
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ret = phydev->drv->write_mmd(phydev, devad, regnum, val);
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} else if (phydev->is_c45) {
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u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
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