From 15a17aae5f803551981a7acc6a4058b247a7452c Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Mon, 8 Dec 2014 16:30:00 +0100 Subject: [PATCH] drm/i915: Check mask/bit helper functions After a bit of irc discussion we've concluded that it would be prudent to check that callers use the mask/enable paramters correctly. So add a WARN_ON. Spurred by Damien's bugfix which added _MASKED_FIELD. v2: We use WARN_ON(1) a lot to catch default cases in switch blocks which should always be extended. So this doesn't work really. Dunno why gcc only started complaining when I've moved the WARN out of the static inline helper to address a feedback from Jani. Cc: Damien Lespiau Cc: Chris Wilson Cc: Jani Nikula Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_irq.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 08a5a4ba52ac..e6a1db36928e 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -183,6 +183,8 @@ static void ilk_update_gt_irq(struct drm_i915_private *dev_priv, { assert_spin_locked(&dev_priv->irq_lock); + WARN_ON(enabled_irq_mask & ~interrupt_mask); + if (WARN_ON(!intel_irqs_enabled(dev_priv))) return; @@ -229,6 +231,8 @@ static void snb_update_pm_irq(struct drm_i915_private *dev_priv, { uint32_t new_val; + WARN_ON(enabled_irq_mask & ~interrupt_mask); + assert_spin_locked(&dev_priv->irq_lock); new_val = dev_priv->pm_irq_mask; @@ -328,6 +332,8 @@ void ibx_display_interrupt_update(struct drm_i915_private *dev_priv, sdeimr &= ~interrupt_mask; sdeimr |= (~enabled_irq_mask & interrupt_mask); + WARN_ON(enabled_irq_mask & ~interrupt_mask); + assert_spin_locked(&dev_priv->irq_lock); if (WARN_ON(!intel_irqs_enabled(dev_priv))) -- 2.20.1