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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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hauke Mehrtens 2013-12-20 02:16:08 +01:00 committed by David S. Miller
parent 5ab6329c52
commit 7befa6abe0
2 changed files with 7 additions and 0 deletions
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6
drivers/net/ethernet/broadcom/b44.c
View File

@ -2206,6 +2206,12 @@ static int b44_init_one(struct ssb_device *sdev,
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;

1
drivers/net/ethernet/broadcom/b44.h
View File

@ -282,6 +282,7 @@ struct ring_info {
#define B44_MCAST_TABLE_SIZE 32
#define B44_PHY_ADDR_NO_LOCAL_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 \