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| author | Tobias Klauser <tklauser@distanz.ch> | 2017-04-02 20:08:04 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-12 12:42:07 +0200 |
| commit | 36463a76abeb9d5f451ffdb5a55340051168a74c (patch) | |
| tree | eeeda4cb82846be649088d1d68107af6edb21b0a /arch | |
| parent | be9fe9d4898827259e8fdfe2505074dfa1b6e63f (diff) | |
| download | linux-stable-36463a76abeb9d5f451ffdb5a55340051168a74c.tar.gz linux-stable-36463a76abeb9d5f451ffdb5a55340051168a74c.tar.bz2 linux-stable-36463a76abeb9d5f451ffdb5a55340051168a74c.zip | |
nios2: reserve boot memory for device tree
commit 921d701e6f31e1ffaca3560416af1aa04edb4c4f upstream.
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().
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/nios2/kernel/prom.c | 7 | ||||
| -rw-r--r-- | arch/nios2/kernel/setup.c | 3 |
2 files changed, 10 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; diff --git a/arch/nios2/kernel/setup.c b/arch/nios2/kernel/setup.c index a3fa80d1aacc..72ef4077bf2b 100644 --- a/arch/nios2/kernel/setup.c +++ b/arch/nios2/kernel/setup.c @@ -200,6 +200,9 @@ void __init setup_arch(char **cmdline_p) } #endif /* CONFIG_BLK_DEV_INITRD */ + early_init_fdt_reserve_self(); + early_init_fdt_scan_reserved_mem(); + unflatten_and_copy_device_tree(); setup_cpuinfo(); |