From: Guenter Roeck Date: Mon, 17 Aug 2015 20:45:36 +0000 (-0700) Subject: smsc911x: Fix crash seen if neither ACPI nor OF is configured or used X-Git-Tag: v4.3-rc1~96^2~158 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=62ee783bf1f872ba879e088a669b04afebee899b;p=linux.git smsc911x: Fix crash seen if neither ACPI nor OF is configured or used Commit 0b50dc4fc971 ("Convert smsc911x to use ACPI as well as DT") makes the call to smsc911x_probe_config() unconditional, and no longer fails if there is no device node. device_get_phy_mode() is called unconditionally, and if there is no phy node configured returns an error code. This error code is assigned to phy_interface, and interpreted elsewhere in the code as valid phy mode. This in turn causes qemu to crash when running a variant of realview_pb_defconfig. qemu: hardware error: lan9118_read: Bad reg 0x86 Fixes: 0b50dc4fc971 ("Convert smsc911x to use ACPI as well as DT") Cc: Jeremy Linton Cc Graeme Gregory Signed-off-by: Guenter Roeck Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/smsc/smsc911x.c b/drivers/net/ethernet/smsc/smsc911x.c index 0f21aa3bb537..34f97684506b 100644 --- a/drivers/net/ethernet/smsc/smsc911x.c +++ b/drivers/net/ethernet/smsc/smsc911x.c @@ -2367,12 +2367,17 @@ static const struct smsc911x_ops shifted_smsc911x_ops = { static int smsc911x_probe_config(struct smsc911x_platform_config *config, struct device *dev) { + int phy_interface; u32 width = 0; if (!dev) return -ENODEV; - config->phy_interface = device_get_phy_mode(dev); + phy_interface = device_get_phy_mode(dev); + if (phy_interface < 0) + return phy_interface; + + config->phy_interface = phy_interface; device_get_mac_address(dev, config->mac, ETH_ALEN);