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| author | Huacai Chen <chenhc@lemote.com> | 2014-03-22 17:21:44 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-13 13:59:41 +0200 |
| commit | a93daee35a6d511e71f19c7227c64a9dc2c3e273 (patch) | |
| tree | 5be091ee845e4d5430025b1beedf3d6214989ed1 /arch/mips | |
| parent | 5d73b6735480b56ca74c8474368f01a31cabfb57 (diff) | |
| download | linux-3.10-a93daee35a6d511e71f19c7227c64a9dc2c3e273.tar.gz linux-3.10-a93daee35a6d511e71f19c7227c64a9dc2c3e273.tar.bz2 linux-3.10-a93daee35a6d511e71f19c7227c64a9dc2c3e273.zip | |
MIPS: Hibernate: Flush TLB entries in swsusp_arch_resume()
commit c14af233fbe279d0e561ecf84f1208b1bae087ef upstream.
The original MIPS hibernate code flushes cache and TLB entries in
swsusp_arch_resume(). But they are removed in Commit 44eeab67416711
(MIPS: Hibernation: Remove SMP TLB and cacheflushing code.). A cross-
CPU flush is surely unnecessary because all but the local CPU have
already been disabled. But a local flush (at least the TLB flush) is
needed. When we do hibernation on Loongson-3 with an E1000E NIC, it is
very easy to produce a kernel panic (kernel page fault, or unaligned
access). The root cause is E1000E driver use vzalloc_node() to allocate
pages, the stale TLB entries of the booting kernel will be misused by
the resumed target kernel.
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/6643/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/power/hibernate.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/mips/power/hibernate.S b/arch/mips/power/hibernate.S index 7e0277a1048..32a7c828f07 100644 --- a/arch/mips/power/hibernate.S +++ b/arch/mips/power/hibernate.S @@ -43,6 +43,7 @@ LEAF(swsusp_arch_resume) bne t1, t3, 1b PTR_L t0, PBE_NEXT(t0) bnez t0, 0b + jal local_flush_tlb_all /* Avoid TLB mismatch after kernel resume */ PTR_LA t0, saved_regs PTR_L ra, PT_R31(t0) PTR_L sp, PT_R29(t0) |