[Intel-gfx] [PATCH 04/11] drm/i915: split intel_modeset_driver_remove() to pre/post irq uninstall

[Jani Nikula]

Split intel_modeset_driver_remove() to two, the part with working irqs
before irq uninstall, and the part after irq uninstall. Move
irq_unintall() closer to the layer it belongs.

The error path in i915_driver_modeset_probe() looks obviously weird
after this, but remains as good or broken as it ever was. No functional
changes.

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 12 +++++-------
 drivers/gpu/drm/i915/display/intel_display.h |  1 +
 drivers/gpu/drm/i915/i915_drv.c              |  7 +++++++
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 05fb672a00b9..d78f2c908d8b 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -17066,6 +17066,7 @@ static void intel_hpd_poll_fini(struct drm_i915_private *i915)
 	drm_connector_list_iter_end(&conn_iter);
 }
 
+/* part #1: call before irq uninstall */
 void intel_modeset_driver_remove(struct drm_i915_private *i915)
 {
 	flush_workqueue(i915->flip_wq);
@@ -17073,14 +17074,11 @@ void intel_modeset_driver_remove(struct drm_i915_private *i915)
 
 	flush_work(&i915->atomic_helper.free_work);
 	WARN_ON(!llist_empty(&i915->atomic_helper.free_list));
+}
 
-	/*
-	 * Interrupts and polling as the first thing to avoid creating havoc.
-	 * Too much stuff here (turning of connectors, ...) would
-	 * experience fancy races otherwise.
-	 */
-	intel_irq_uninstall(i915);
-
+/* part #2: call after irq uninstall */
+void intel_modeset_driver_remove_noirq(struct drm_i915_private *i915)
+{
 	/*
 	 * Due to the hpd irq storm handling the hotplug work can re-arm the
 	 * poll handlers. Hence disable polling after hpd handling is shut down.
diff --git a/drivers/gpu/drm/i915/display/intel_display.h b/drivers/gpu/drm/i915/display/intel_display.h
index 2782f23ee887..d0705f338048 100644
--- a/drivers/gpu/drm/i915/display/intel_display.h
+++ b/drivers/gpu/drm/i915/display/intel_display.h
@@ -579,6 +579,7 @@ void intel_display_print_error_state(struct drm_i915_error_state_buf *e,
 void intel_modeset_init_hw(struct drm_i915_private *i915);
 int intel_modeset_init(struct drm_i915_private *i915);
 void intel_modeset_driver_remove(struct drm_i915_private *i915);
+void intel_modeset_driver_remove_noirq(struct drm_i915_private *i915);
 void intel_display_resume(struct drm_device *dev);
 void intel_init_pch_refclk(struct drm_i915_private *dev_priv);
 
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 16ac5e88e1ec..f0679139282d 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -327,6 +327,9 @@ static int i915_driver_modeset_probe(struct drm_i915_private *i915)
 	i915_gem_driver_release(i915);
 cleanup_modeset:
 	intel_modeset_driver_remove(i915);
+	intel_irq_uninstall(i915);
+	intel_modeset_driver_remove_noirq(i915);
+	goto cleanup_csr;
 cleanup_irq:
 	intel_irq_uninstall(i915);
 cleanup_csr:
@@ -340,6 +343,10 @@ static void i915_driver_modeset_remove(struct drm_i915_private *i915)
 {
 	intel_modeset_driver_remove(i915);
 
+	intel_irq_uninstall(i915);
+
+	intel_modeset_driver_remove_noirq(i915);
+
 	intel_bios_driver_remove(i915);
 
 	intel_vga_unregister(i915);
-- 
2.20.1