[PATCH] thermal: Don't call thermal_zone_device_update inside spinlock

From: Maurice Petallo
Date: Thu Nov 13 2014 - 05:49:37 EST


The driver calls spin_lock_irqsave during DTS interrupt. The interrupt
handle then calls thermal_zone_device_update which implicitly calls
a sleep function and produce the following bug:

BUG: sleeping function called from invalid context at kernel/locking/mutex.c:97
in_atomic(): 1, irqs_disabled(): 1, pid: 920, name: irq/86-soc_dts
CPU: 0 PID: 920 Comm: irq/86-soc_dts Tainted: G E 3.17.0-rc2+ #1
Hardware name: Intel Corp. VALLEYVIEW B3 PLATFORM/NOTEBOOK, BIOS BYTICRB1.86C.0092.R31.1408290850 08/29/2014
00000000 00000000 c25dbe74 c1818cfd f3cc488c c25dbe9c c1059305 c1b4063b
00000001 00000001 00000398 f3cc488c f6817644 f6817644 f3ecc6c0 c25dbea8
c18208f2 f6817400 c25dbebc c159b0bb c25dbedc f6817400 f32a2300 c25dbee8
Call Trace:
[<c1818cfd>] dump_stack+0x48/0x60
[<c1059305>] __might_sleep+0xec/0xf4
[<c18208f2>] mutex_lock+0x1c/0x34
[<c159b0bb>] thermal_zone_get_temp+0x34/0x59
[<c159bde5>] thermal_zone_device_update+0x2d/0xcb
[<f85da16a>] ? iosf_mbi_write+0x6c/0x74 [iosf_mbi]
[<f7c7445d>] soc_irq_thread_fn+0x10c/0x163 [intel_soc_dts_thermal]
[<c107b72b>] irq_thread_fn+0x18/0x2a
[<c107bedb>] irq_thread+0x81/0x11f
[<c107b713>] ? irq_finalize_oneshot+0x7c/0x7c
[<c107bf79>] ? irq_thread+0x11f/0x11f
[<c107be5a>] ? wake_threads_waitq+0x31/0x31
[<c1054217>] kthread+0x87/0x8c
[<c1821e41>] ret_from_kernel_thread+0x21/0x30
[<c1054190>] ? __kthread_parkme+0x55/0x55

Signed-off-by: Maurice Petallo <mauricex.r.petallo@xxxxxxxxx>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
---
drivers/thermal/intel_soc_dts_thermal.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/thermal/intel_soc_dts_thermal.c b/drivers/thermal/intel_soc_dts_thermal.c
index a6a0a18..5580f5b 100644
--- a/drivers/thermal/intel_soc_dts_thermal.c
+++ b/drivers/thermal/intel_soc_dts_thermal.c
@@ -360,6 +360,9 @@ static void proc_thermal_interrupt(void)
u32 sticky_out;
int status;
u32 ptmc_out;
+ unsigned long flags;
+
+ spin_lock_irqsave(&intr_notify_lock, flags);

/* Clear APIC interrupt */
status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
@@ -378,21 +381,20 @@ static void proc_thermal_interrupt(void)
/* reset sticky bit */
status = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
SOC_DTS_OFFSET_PTTSS, sticky_out);
+ spin_unlock_irqrestore(&intr_notify_lock, flags);
+
for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
pr_debug("TZD update for zone %d\n", i);
thermal_zone_device_update(soc_dts[i]->tzone);
}
- }
+ } else
+ spin_unlock_irqrestore(&intr_notify_lock, flags);

}

static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data)
{
- unsigned long flags;
-
- spin_lock_irqsave(&intr_notify_lock, flags);
proc_thermal_interrupt();
- spin_unlock_irqrestore(&intr_notify_lock, flags);
pr_debug("proc_thermal_interrupt\n");

return IRQ_HANDLED;
--
1.7.9.5

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