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With -Werror=array-bounds, gcc v4.7.x warns that in phy_find_valid(), the settings[] "array subscript is above array bounds", I think because idx is a signed integer and if the caller supplied idx < 0, we pass the guard but still reference out of bounds. Fix this by making idx unsigned here and elsewhere. Signed-off-by: Bjorn Helgaas <[email protected]> Acked-by: Florian Fainelli <[email protected]> Signed-off-by: David S. Miller <[email protected]>