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| author | Vineet Gupta <vgupta@synopsys.com> | 2013-02-21 17:37:06 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-02-26 14:25:18 +0530 |
| commit | eab6a08c082b82dff884eb49a2229b0474d0b7e5 (patch) | |
| tree | 4acffa75b89ecdef8d4f38558155b0afdd2fbe19 /arch/arc | |
| parent | fc32781bfdb56dad883469b65e468e749ef35fe5 (diff) | |
| download | linux-eab6a08c082b82dff884eb49a2229b0474d0b7e5.tar.bz2 | |
ARC: make a copy of flat DT
The flat DT (currently embedded in vmlinux) is in .init section.
The unflattened/binary tree doesn't copy strings through and references
them from orig flat DT - which could cause catestrohpy if of_* APIs are
called post init, say from a driver which is a loadable module.
Reported-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/include/asm/mach_desc.h | 2 | ||||
| -rw-r--r-- | arch/arc/kernel/devtree.c | 15 | ||||
| -rw-r--r-- | arch/arc/kernel/setup.c | 2 |
3 files changed, 19 insertions, 0 deletions
diff --git a/arch/arc/include/asm/mach_desc.h b/arch/arc/include/asm/mach_desc.h index eaebaf835f85..9998dc846ebb 100644 --- a/arch/arc/include/asm/mach_desc.h +++ b/arch/arc/include/asm/mach_desc.h @@ -82,4 +82,6 @@ __attribute__((__section__(".arch.info.init"))) = { \ }; extern struct machine_desc *setup_machine_fdt(void *dt); +extern void __init copy_devtree(void); + #endif diff --git a/arch/arc/kernel/devtree.c b/arch/arc/kernel/devtree.c index a7d98b30358b..bdee3a812052 100644 --- a/arch/arc/kernel/devtree.c +++ b/arch/arc/kernel/devtree.c @@ -106,3 +106,18 @@ struct machine_desc * __init setup_machine_fdt(void *dt) return mdesc_best; } + +/* + * Copy the flattened DT out of .init since unflattening doesn't copy strings + * and the normal DT APIs refs them from orig flat DT + */ +void __init copy_devtree(void) +{ + void *alloc = early_init_dt_alloc_memory_arch( + be32_to_cpu(initial_boot_params->totalsize), 64); + if (alloc) { + memcpy(alloc, initial_boot_params, + be32_to_cpu(initial_boot_params->totalsize)); + initial_boot_params = alloc; + } +} diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c index e591c6ae88a6..dc0f968dae0a 100644 --- a/arch/arc/kernel/setup.c +++ b/arch/arc/kernel/setup.c @@ -354,6 +354,8 @@ void __init setup_arch(char **cmdline_p) setup_arch_memory(); + /* copy flat DT out of .init and then unflatten it */ + copy_devtree(); unflatten_device_tree(); /* Can be issue if someone passes cmd line arg "ro" |