From 460116be15ba629ab194b43d94c9eb88b7969d9f Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Thu, 9 Jun 2011 04:58:36 +0100 Subject: [PATCH] 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: Nicolas Pitre Acked-by: Grant Likely Signed-off-by: Russell King --- arch/arm/kernel/devtree.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c index a701e4226a6c8..0cdd7b456cb2a 100644 --- a/arch/arm/kernel/devtree.c +++ b/arch/arm/kernel/devtree.c @@ -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 */ -- 2.39.5