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Commit f506cd48 authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Russell King
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ARM: 6953/1: DT: don't try to access physical address zero 



If the DT physical address is zero, this is equivalent to no DT.
Especially when the actual RAM physical address is not located at zero,
the result of phys_to_virt() would point to la-la-land and crash the
kernel, which crash is completely silent this early during boot.

Signed-off-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 6075e9df

arch/arm/kernel/devtree.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -76,6 +76,9 @@ struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys) 
	unsigned long dt_root;

	unsigned long dt_root;

	const char *model;

	const char *model;





	if (!dt_phys)

		return NULL;



	devtree = phys_to_virt(dt_phys);

	devtree = phys_to_virt(dt_phys);





	/* check device tree validity */

	/* check device tree validity */