From 3dec0095f71e7d00b7f6180229fd32a2d0a6ce8d Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Fri, 20 Aug 2010 21:40:52 +0200 Subject: [PATCH] drm/i915: unload: fix idle_timer/idle_work races idle_work wasn't cleaned up at all. It takes &dev->struct_mutex, but accesss the mode_config crtc list (without any other locking!). Hence this work needs to be canceled before calling drm_mode_config_cleanup. As evidenced by the kernel's object debuggin code, the current code also cleans up the timer to early (it gets rearmed). So move it right before the final cleanup (it seems to work). Also unconditionally set up the idle_timer in intel_increase_pllclock. If we're unlucky the timer might fire right away, rendering the call in the modesetting teardown pointless. Signed-off-by: Daniel Vetter Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/intel_display.c | 27 +++++++++++++++------------ 1 file changed, 15 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 20be935830b0..ccfc10559c17 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -43,7 +43,7 @@ bool intel_pipe_has_type (struct drm_crtc *crtc, int type); static void intel_update_watermarks(struct drm_device *dev); -static void intel_increase_pllclock(struct drm_crtc *crtc, bool schedule); +static void intel_increase_pllclock(struct drm_crtc *crtc); static void intel_crtc_update_cursor(struct drm_crtc *crtc); typedef struct { @@ -1527,7 +1527,7 @@ intel_pipe_set_base_atomic(struct drm_crtc *crtc, struct drm_framebuffer *fb, intel_update_fbc(crtc, &crtc->mode); intel_wait_for_vblank(dev, intel_crtc->pipe); - intel_increase_pllclock(crtc, true); + intel_increase_pllclock(crtc); return 0; } @@ -4664,7 +4664,7 @@ static void intel_crtc_idle_timer(unsigned long arg) queue_work(dev_priv->wq, &dev_priv->idle_work); } -static void intel_increase_pllclock(struct drm_crtc *crtc, bool schedule) +static void intel_increase_pllclock(struct drm_crtc *crtc) { struct drm_device *dev = crtc->dev; drm_i915_private_t *dev_priv = dev->dev_private; @@ -4699,9 +4699,8 @@ static void intel_increase_pllclock(struct drm_crtc *crtc, bool schedule) } /* Schedule downclock */ - if (schedule) - mod_timer(&intel_crtc->idle_timer, jiffies + - msecs_to_jiffies(CRTC_IDLE_TIMEOUT)); + mod_timer(&intel_crtc->idle_timer, jiffies + + msecs_to_jiffies(CRTC_IDLE_TIMEOUT)); } static void intel_decrease_pllclock(struct drm_crtc *crtc) @@ -4837,7 +4836,7 @@ void intel_mark_busy(struct drm_device *dev, struct drm_gem_object *obj) I915_WRITE(FW_BLC_SELF, fw_blc_self | FW_BLC_SELF_EN_MASK); } /* Non-busy -> busy, upclock */ - intel_increase_pllclock(crtc, true); + intel_increase_pllclock(crtc); intel_crtc->busy = true; } else { /* Busy -> busy, put off timer */ @@ -6039,12 +6038,9 @@ void intel_modeset_cleanup(struct drm_device *dev) continue; intel_crtc = to_intel_crtc(crtc); - intel_increase_pllclock(crtc, false); - del_timer_sync(&intel_crtc->idle_timer); + intel_increase_pllclock(crtc); } - del_timer_sync(&dev_priv->idle_timer); - if (dev_priv->display.disable_fbc) dev_priv->display.disable_fbc(dev); @@ -6078,10 +6074,17 @@ void intel_modeset_cleanup(struct drm_device *dev) drm_irq_uninstall(dev); cancel_work_sync(&dev_priv->hotplug_work); + /* Shut off idle work before the crtcs get freed. */ + list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { + intel_crtc = to_intel_crtc(crtc); + del_timer_sync(&intel_crtc->idle_timer); + } + del_timer_sync(&dev_priv->idle_timer); + cancel_work_sync(&dev_priv->idle_work); + drm_mode_config_cleanup(dev); } - /* * Return which encoder is currently attached for connector. */ -- GitLab