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