2013/10/16 Imre Deak <imre.deak@xxxxxxxxx>:
> There is no hard need for this to be a spin lock, as we don't take these
> locks in irq context from anywhere. An upcoming patch will add calls to
> punit read/write functions from within regions protected by this lock
> and those functions need a mutex in turn. As a solution for that convert
> the spin lock to be a mutex.
Not even from snd_hda_intel? Did we check this?
>
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 2 +-
> drivers/gpu/drm/i915/intel_pm.c | 26 +++++++++++++-------------
> 2 files changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index ca05f3a..e4354dd 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -910,7 +910,7 @@ struct intel_ilk_power_mgmt {
> /* Power well structure for haswell */
> struct i915_power_well {
> struct drm_device *device;
> - spinlock_t lock;
> + struct mutex lock;
> /* power well enable/disable usage count */
> int count;
> int i915_request;
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 57d08a2..f7363a8 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -5476,9 +5476,9 @@ void intel_display_power_get(struct drm_device *dev,
> if (is_always_on_power_domain(dev, domain))
> return;
>
> - spin_lock_irq(&power_well->lock);
> + mutex_lock(&power_well->lock);
> __intel_power_well_get(power_well);
> - spin_unlock_irq(&power_well->lock);
> + mutex_unlock(&power_well->lock);
> }
>
> void intel_display_power_put(struct drm_device *dev,
> @@ -5493,9 +5493,9 @@ void intel_display_power_put(struct drm_device *dev,
> if (is_always_on_power_domain(dev, domain))
> return;
>
> - spin_lock_irq(&power_well->lock);
> + mutex_lock(&power_well->lock);
> __intel_power_well_put(power_well);
> - spin_unlock_irq(&power_well->lock);
> + mutex_unlock(&power_well->lock);
> }
>
> static struct i915_power_well *hsw_pwr;
> @@ -5506,9 +5506,9 @@ void i915_request_power_well(void)
> if (WARN_ON(!hsw_pwr))
> return;
>
> - spin_lock_irq(&hsw_pwr->lock);
> + mutex_lock(&hsw_pwr->lock);
> __intel_power_well_get(hsw_pwr);
> - spin_unlock_irq(&hsw_pwr->lock);
> + mutex_unlock(&hsw_pwr->lock);
> }
> EXPORT_SYMBOL_GPL(i915_request_power_well);
>
> @@ -5518,9 +5518,9 @@ void i915_release_power_well(void)
> if (WARN_ON(!hsw_pwr))
> return;
>
> - spin_lock_irq(&hsw_pwr->lock);
> + mutex_lock(&hsw_pwr->lock);
> __intel_power_well_put(hsw_pwr);
> - spin_unlock_irq(&hsw_pwr->lock);
> + mutex_unlock(&hsw_pwr->lock);
> }
> EXPORT_SYMBOL_GPL(i915_release_power_well);
>
> @@ -5531,7 +5531,7 @@ int i915_init_power_well(struct drm_device *dev)
> hsw_pwr = &dev_priv->power_well;
>
> hsw_pwr->device = dev;
> - spin_lock_init(&hsw_pwr->lock);
> + mutex_init(&hsw_pwr->lock);
> hsw_pwr->count = 0;
>
> return 0;
> @@ -5553,7 +5553,7 @@ void intel_set_power_well(struct drm_device *dev, bool enable)
> if (!i915_disable_power_well && !enable)
> return;
>
> - spin_lock_irq(&power_well->lock);
> + mutex_lock(&power_well->lock);
>
> /*
> * This function will only ever contribute one
> @@ -5572,7 +5572,7 @@ void intel_set_power_well(struct drm_device *dev, bool enable)
> __intel_power_well_put(power_well);
>
> out:
> - spin_unlock_irq(&power_well->lock);
> + mutex_unlock(&power_well->lock);
> }
>
> static void intel_resume_power_well(struct drm_device *dev)
> @@ -5583,9 +5583,9 @@ static void intel_resume_power_well(struct drm_device *dev)
> if (!HAS_POWER_WELL(dev))
> return;
>
> - spin_lock_irq(&power_well->lock);
> + mutex_lock(&power_well->lock);
> __intel_set_power_well(dev, power_well->count > 0);
> - spin_unlock_irq(&power_well->lock);
> + mutex_unlock(&power_well->lock);
> }
>
> /*
> --
> 1.8.4
>
> _______________________________________________
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Paulo Zanoni
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