stmmac: add a warning when aliases are not present in device tree

[Pavel Machek]

If aliases are not present in device tree, stmmac_platform.c will
happily assign bus_id of 0 to all the ethernet interfaces, resulting
in hard to debug problems.

At least warn the user about the problem.

Signed-off-by: Pavel Machek <pavel@xxxxxxx>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index f9b42f1..ee8aa26 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -161,8 +161,10 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
 		plat->max_speed = -1;
 
 	plat->bus_id = of_alias_get_id(np, "ethernet");
-	if (plat->bus_id < 0)
+	if (plat->bus_id < 0) {
+		dev_warn(&pdev->dev, "no aliases for ethernet; multiple ethernets will break\n");
 		plat->bus_id = 0;
+	}
 
 	/* Default to phy auto-detection */
 	plat->phy_addr = -1;

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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