This patch adds clear interrupt to exynos4_mct_dying_cpu(). Without
clearing, after turning on non boot cpu at wakeup from suspend to
ram, not cleared tick interrupt occurs and it causes following null
deference for MCT_INT_SPI type mct.
[ 51.251378] Unable to handle kernel NULL pointer dereference at virtual address 00000040
[ 51.257980] pgd = c0004000
[ 51.260666] [00000040] *pgd=00000000
[ 51.264222] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 51.269503] Modules linked in:
[ 51.272541] CPU: 7 PID: 53 Comm: ksoftirqd/7 Tainted: G W 4.9.0-rc7-next-20161201-00007-g74076859ec44 #140
[ 51.283282] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[ 51.289348] task: ee942d00 task.stack: ee960000
[ 51.293861] PC is at tick_periodic+0x38/0xb0
[ 51.298102] LR is at tick_handle_periodic+0x1c/0x90
[ 51.302956] pc : [<c0183358>] lr : [<c01833ec>] psr: 20000093
[ 51.302956] sp : ee961e18 ip : f0806000 fp : 00000100
[ 51.314391] r10: c0c0ef6a r9 : 0000000b r8 : eebcf080
[ 51.319591] r7 : ee961e7c r6 : 00000000 r5 : 00000007 r4 : ef013ec0
[ 51.326090] r3 : 00000000 r2 : 2e4ac000 r1 : c09ae9a8 r0 : 00000007
[ 51.332591] Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none
[ 51.339781] Control: 10c5387d Table: 4000406a DAC: 00000051
[ 51.345501] Process ksoftirqd/7 (pid: 53, stack limit = 0xee960210)
[ 51.351740] Stack: (0xee961e18 to 0xee962000)
[ 51.356073] 1e00: ef014db0 c0c03dac
[ 51.364222] 1e20: 00000000 ef013ec0 ee854100 00000000 ee961e7c 00000039 ee854100 c0c0ef6a
[ 51.372367] 1e40: 00000100 c055bd44 ee852840 c0164a18 00000000 00000001 ee854100 ee854100
[ 51.380512] 1e60: c0c03f24 c0b6324c c0c02080 c0c02080 40000006 c0164ac4 00000000 00000000
[ 51.388658] 1e80: 00000100 ee854100 ee854160 c0164b38 ee854100 ee854160 c0c03f24 c0167e9c
[ 51.396804] 1ea0: 00000039 c0c0cbac c0c0cbac c0b6324c c0c02080 c01675e0 c0c0cc5c c0c0cc60
[ 51.404949] 1ec0: 00000000 c011fd3c 00000000 00000006 c0c02098 ee960000 c0c02080 c011ff6c
[ 51.413095] 1ee0: ee961f0c c06fb4a4 ee961ee0 c0c47f80 0000000a ffff9ed5 c0c03900 04208040
[ 51.421240] 1f00: c0c0a174 ee960000 ee867b00 00000007 00000001 c0c0a174 00000002 00000000
[ 51.429385] 1f20: 00000000 c01200b8 ee960000 c013a50c 00000000 ee867b80 ee867b00 c013a3b0
[ 51.437530] 1f40: 00000000 00000000 00000000 c0136cbc ffffffff 00000001 00000007 ee867b00
[ 51.445676] 1f60: 00000000 00270027 dead4ead ffffffff ffffffff ee961f74 ee961f74 00000000
[ 51.453822] 1f80: 00000000 dead4ead ffffffff ffffffff ee961f90 ee961f90 ee961fac ee867b80
[ 51.461967] 1fa0: c0136be0 00000000 00000000 c0107a78 00000000 00000000 00000000 00000000
[ 51.470112] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 51.478258] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffffffff ffffffff
[ 51.486409] [<c0183358>] (tick_periodic) from [<ef013ec0>] (0xef013ec0)
[ 51.492990] Code: ee1d2f90 e34c30b6 e8bd4070 e7923003 (e5933040)
[ 51.499057] ---[ end trace 995703fe1bede0b4 ]---
Fixes: 56a94f13919c ("clocksource: exynos_mct: Avoid blocking calls in the cpu hotplug notifier")
Cc: stable@xxxxxxxxxxxxxxx #v4.2+ #v4.1.4+ #3.18.18+ #v3.16.18+ #v3.12.46+
Reported-by: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
Signed-off-by: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
Signed-off-by: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
---
drivers/clocksource/exynos_mct.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 4da1dc2..670ff0f 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -495,6 +495,7 @@ static int exynos4_mct_dying_cpu(unsigned int cpu)
if (mct_int_type == MCT_INT_SPI) {
if (evt->irq != -1)
disable_irq_nosync(evt->irq);
+ exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
} else {
disable_percpu_irq(mct_irqs[MCT_L0_IRQ]);
}
--
1.9.1
--
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