Hi, A minor thing. Your patch title makes us think this fix affects the thermal subsystem completely, whereas it affects a specific driver.
On Thu, Nov 13, 2014 at 06:47:04PM +0800, Maurice Petallo wrote:
> 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.peta...@intel.com>
> Acked-by: Srinivas Pandruvada <srinivas.pandruv...@linux.intel.com>
> ---
> 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;
A part from the minor thing I mentioned before, you can add my:
Acked-by: Eduardo Valentin <edubez...@gmail.com>
> --
> 1.7.9.5
>
> --
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