[PATCH 4.19 080/118] arm64: hibernate: Avoid sending cross-calling with interrupts disabled

From: Greg Kroah-Hartman
Date: Tue Dec 11 2018 - 10:59:49 EST

4.19-stable review patch. If anyone has any objections, please let me know.


From: Will Deacon <will.deacon@xxxxxxx>

commit b4aecf78083d8c6424657c1746c7c3de6e61669f upstream.

Since commit 3b8c9f1cdfc50 ("arm64: IPI each CPU after invalidating the
I-cache for kernel mappings"), a call to flush_icache_range() will use
an IPI to cross-call other online CPUs so that any stale instructions
are flushed from their pipelines. This triggers a WARN during the
hibernation resume path, where flush_icache_range() is called with
interrupts disabled and is therefore prone to deadlock:

| Disabling non-boot CPUs ...
| CPU1: shutdown
| psci: CPU1 killed.
| CPU2: shutdown
| psci: CPU2 killed.
| CPU3: shutdown
| psci: CPU3 killed.
| WARNING: CPU: 0 PID: 1 at ../kernel/smp.c:416 smp_call_function_many+0xd4/0x350
| Modules linked in:
| CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.20.0-rc4 #1

Since all secondary CPUs have been taken offline prior to invalidating
the I-cache, there's actually no need for an IPI and we can simply call
__flush_icache_range() instead.

Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: 3b8c9f1cdfc50 ("arm64: IPI each CPU after invalidating the I-cache for kernel mappings")
Reported-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
Tested-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
Tested-by: James Morse <james.morse@xxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

arch/arm64/kernel/hibernate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -214,7 +214,7 @@ static int create_safe_exec_page(void *s

memcpy((void *)dst, src_start, length);
- flush_icache_range(dst, dst + length);
+ __flush_icache_range(dst, dst + length);

pgdp = pgd_offset_raw(allocator(mask), dst_addr);
if (pgd_none(READ_ONCE(*pgdp))) {