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authorHuacai Chen <chenhc@lemote.com>2014-03-22 17:21:44 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-13 13:32:48 +0200
commit771004298d9a73ff1bca0b4ff5168c74d3ff7af0 (patch)
treebb58bb21e91580603d2bcb76c902a6eeb714a25c
parent9b12b053e0e4123df93f4b9a408d7afc64c1485f (diff)
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>
-rw-r--r--arch/mips/power/hibernate.S1
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)