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| author | Tobias Klauser <tklauser@distanz.ch> | 2017-04-03 05:08:04 +0200 |
|---|---|---|
| committer | Ley Foon Tan <ley.foon.tan@intel.com> | 2017-04-03 05:13:57 +0200 |
| commit | 921d701e6f31e1ffaca3560416af1aa04edb4c4f (patch) | |
| tree | 44cec5977023a0e15e7f5da612405fb174617b97 /arch/nios2/kernel/prom.c | |
| parent | Linux 4.11-rc5 (diff) | |
| download | linux-921d701e6f31e1ffaca3560416af1aa04edb4c4f.tar.xz linux-921d701e6f31e1ffaca3560416af1aa04edb4c4f.zip | |
nios2: reserve boot memory for device tree
Make sure to reserve the boot memory for the flattened device tree.
Otherwise it might get overwritten, e.g. when initial_boot_params is
copied, leading to a corrupted FDT and a boot hang/crash:
bootconsole [early0] enabled
Early console on uart16650 initialized at 0xf8001600
OF: fdt: Error -11 processing FDT
Kernel panic - not syncing: setup_cpuinfo: No CPU found in devicetree!
---[ end Kernel panic - not syncing: setup_cpuinfo: No CPU found in devicetree!
Guenter Roeck says:
> I think I found the problem. In unflatten_and_copy_device_tree(), with added
> debug information:
>
> OF: fdt: initial_boot_params=c861e400, dt=c861f000 size=28874 (0x70ca)
>
> ... and then initial_boot_params is copied to dt, which results in corrupted
> fdt since the memory overlaps. Looks like the initial_boot_params memory
> is not reserved and (re-)allocated by early_init_dt_alloc_memory_arch().
Cc: stable@vger.kernel.org
Reported-by: Guenter Roeck <linux@roeck-us.net>
Reference: http://lkml.kernel.org/r/20170226210338.GA19476@roeck-us.net
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Ley Foon Tan <ley.foon.tan@intel.com>
Diffstat (limited to 'arch/nios2/kernel/prom.c')
| -rw-r--r-- | arch/nios2/kernel/prom.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/nios2/kernel/prom.c b/arch/nios2/kernel/prom.c index 367c5426157b..3901b80d4420 100644 --- a/arch/nios2/kernel/prom.c +++ b/arch/nios2/kernel/prom.c @@ -48,6 +48,13 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) return alloc_bootmem_align(size, align); } +int __init early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size, + bool nomap) +{ + reserve_bootmem(base, size, BOOTMEM_DEFAULT); + return 0; +} + void __init early_init_devtree(void *params) { __be32 *dtb = (u32 *)__dtb_start; |