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ARM: 6953/1: DT: don't try to access physical address zero

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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: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre 2011-06-09 04:58:36 +01:00 committed by Russell King
parent 6075e9df47
commit f506cd48a4
1 changed files with 3 additions and 0 deletions
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3
arch/arm/kernel/devtree.c
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@ -76,6 +76,9 @@ struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
unsigned long dt_root;
const char *model;
if (!dt_phys)
return NULL;
devtree = phys_to_virt(dt_phys);
/* check device tree validity */