From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
For some reason, every single time I try to run module_reload
something tries to read the connector sysfs files. This happens
after we destroy the encoders and before we destroy the connectors, so
when the sysfs read triggers the connector detect() function,
intel_conector->encoder points to memory that was already freed.
The bad backtrace is just:
[<ffffffff8163ca9a>] dump_stack+0x54/0x74
[<ffffffffa00c2c8e>] intel_dp_detect+0x1e/0x4b0 [i915]
[<ffffffffa001913d>] status_show+0x3d/0x80 [drm]
[<ffffffff813d5340>] dev_attr_show+0x20/0x60
[<ffffffff81221f50>] ? sysfs_read_file+0x80/0x1b0
[<ffffffff81221f79>] sysfs_read_file+0xa9/0x1b0
[<ffffffff811aaf1e>] vfs_read+0x9e/0x170
[<ffffffff811aba4c>] SyS_read+0x4c/0xa0
[<ffffffff8164e392>] system_call_fastpath+0x16/0x1b
But if you add tons of memory checking debug options to your Kernel
you'll also see:
- general protection fault: 0000
- BUG kmalloc-4096 (Tainted: G D W ): Poison overwritten
- INFO: Allocated in intel_ddi_init+0x65/0x270 [i915]
- INFO: Freed in intel_dp_encoder_destroy+0x69/0xb0 [i915]
Among a bunch of other error messages.
So this commit just destroys the sysfs files before both the encoder
and connectors are freed.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_crt.c | 1 -
drivers/gpu/drm/i915/intel_display.c | 5 +++++
drivers/gpu/drm/i915/intel_dp.c | 1 -
drivers/gpu/drm/i915/intel_dsi.c | 1 -
drivers/gpu/drm/i915/intel_dvo.c | 1 -
drivers/gpu/drm/i915/intel_hdmi.c | 1 -
drivers/gpu/drm/i915/intel_lvds.c | 1 -
drivers/gpu/drm/i915/intel_sdvo.c | 7 +++++--
drivers/gpu/drm/i915/intel_tv.c | 1 -
9 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 0263629..942b9ac 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -677,7 +677,6 @@ intel_crt_detect(struct drm_connector *connector, bool force)
static void intel_crt_destroy(struct drm_connector *connector)
{
- drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 065ffed..793061f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10726,6 +10726,7 @@ void intel_modeset_cleanup(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_crtc *crtc;
+ struct drm_connector *connector;
/*
* Interrupts and polling as the first thing to avoid creating havoc.
@@ -10768,6 +10769,10 @@ void intel_modeset_cleanup(struct drm_device *dev)
/* destroy backlight, if any, before the connectors */
intel_panel_destroy_backlight(dev);
+ /* destroy the sysfs files before encoders/connectors */
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head)
+ drm_sysfs_connector_remove(connector);
+
drm_mode_config_cleanup(dev);
intel_cleanup_overlay(dev);
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 95a3159..7bdbb36 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3139,7 +3139,6 @@ intel_dp_connector_destroy(struct drm_connector *connector)
if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
intel_panel_fini(&intel_connector->panel);
- drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 674fd49..9a2fdd2 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -504,7 +504,6 @@ static void intel_dsi_destroy(struct drm_connector *connector)
DRM_DEBUG_KMS("\n");
intel_panel_fini(&intel_connector->panel);
- drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index 91287d1..1b64145 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -367,7 +367,6 @@ static int intel_dvo_get_modes(struct drm_connector *connector)
static void intel_dvo_destroy(struct drm_connector *connector)
{
- drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 6004f9c..4f4d346 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1181,7 +1181,6 @@ static void intel_hdmi_post_disable(struct intel_encoder *encoder)
static void intel_hdmi_destroy(struct drm_connector *connector)
{
- drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index fb3f8ef..ae0c843 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -474,7 +474,6 @@ static void intel_lvds_destroy(struct drm_connector *connector)
intel_panel_fini(&lvds_connector->base.panel);
- drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 5e59d64..a583e8f 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -2009,7 +2009,6 @@ static void intel_sdvo_destroy(struct drm_connector *connector)
intel_sdvo_connector->tv_format);
intel_sdvo_destroy_enhance_property(connector);
- drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(intel_sdvo_connector);
}
@@ -2482,6 +2481,7 @@ intel_sdvo_tv_init(struct intel_sdvo *intel_sdvo, int type)
return true;
err:
+ drm_sysfs_connector_remove(connector);
intel_sdvo_destroy(connector);
return false;
}
@@ -2553,6 +2553,7 @@ intel_sdvo_lvds_init(struct intel_sdvo *intel_sdvo, int device)
return true;
err:
+ drm_sysfs_connector_remove(connector);
intel_sdvo_destroy(connector);
return false;
}
@@ -2624,8 +2625,10 @@ static void intel_sdvo_output_cleanup(struct intel_sdvo *intel_sdvo)
list_for_each_entry_safe(connector, tmp,
&dev->mode_config.connector_list, head) {
- if (intel_attached_encoder(connector) == &intel_sdvo->base)
+ if (intel_attached_encoder(connector) == &intel_sdvo->base) {
+ drm_sysfs_connector_remove(connector);
intel_sdvo_destroy(connector);
+ }
}
}
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index 75925a1..92895f9 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1433,7 +1433,6 @@ intel_tv_get_modes(struct drm_connector *connector)
static void
intel_tv_destroy(struct drm_connector *connector)
{
- drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
--
1.8.3.1
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