41 lines
1.4 KiB
Diff
41 lines
1.4 KiB
Diff
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From 1bfdc259652abe22a587fd6d856c1b71168cccb2 Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Thu, 3 Oct 2013 20:49:10 +0200
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Subject: [PATCH 3/5] b44: abort when no PHY is available at all
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When the phy address is 31, this means that there is no PHY connected
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to this MAC at all, no internal and no external PHY. Reading these PHY
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registers causes a system reset on some routers.
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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---
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drivers/net/ethernet/broadcom/b44.c | 6 ++++++
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drivers/net/ethernet/broadcom/b44.h | 1 +
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2 files changed, 7 insertions(+)
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--- a/drivers/net/ethernet/broadcom/b44.c
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+++ b/drivers/net/ethernet/broadcom/b44.c
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@@ -2207,6 +2207,12 @@ static int b44_init_one(struct ssb_devic
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goto err_out_powerdown;
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}
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+ if (bp->phy_addr == B44_PHY_ADDR_NO_PHY) {
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+ dev_err(sdev->dev, "No PHY present on this MAC, aborting\n");
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+ err = -ENODEV;
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+ goto err_out_powerdown;
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+ }
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+
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bp->mii_if.dev = dev;
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bp->mii_if.mdio_read = b44_mii_read;
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bp->mii_if.mdio_write = b44_mii_write;
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--- a/drivers/net/ethernet/broadcom/b44.h
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+++ b/drivers/net/ethernet/broadcom/b44.h
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@@ -282,6 +282,7 @@ struct ring_info {
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#define B44_MCAST_TABLE_SIZE 32
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#define B44_PHY_ADDR_NO_LOACL_PHY 30 /* no local phy regs */
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+#define B44_PHY_ADDR_NO_PHY 31 /* no phy present at all */
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#define B44_MDC_RATIO 5000000
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#define B44_STAT_REG_DECLARE \
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