[PATCH v2 2/2] drm: remove drm_device_is_unplugged checks in common drm code.
Haixia Shi
hshi at chromium.org
Wed Feb 10 23:18:38 UTC 2016
When USB cable is disconnected, we mark udl device as unplugged so that
udl_detect reports connector status as disconnected, but still keep
the drm device alive until user-space closes it.
Signed-off-by: Haixia Shi <hshi at chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu at chromium.org>
---
drivers/gpu/drm/drm_drv.c | 6 ------
drivers/gpu/drm/drm_fops.c | 2 --
drivers/gpu/drm/drm_gem.c | 3 ---
drivers/gpu/drm/drm_ioctl.c | 3 ---
drivers/gpu/drm/drm_vm.c | 3 ---
drivers/gpu/drm/udl/udl_connector.c | 2 +-
drivers/gpu/drm/udl/udl_drv.c | 1 +
drivers/gpu/drm/udl/udl_drv.h | 3 +++
drivers/gpu/drm/udl/udl_fb.c | 2 +-
drivers/gpu/drm/udl/udl_main.c | 15 +++++++++++++++
include/drm/drmP.h | 14 --------------
11 files changed, 21 insertions(+), 33 deletions(-)
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 167c8d3..f93ee12 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -376,9 +376,6 @@ struct drm_minor *drm_minor_acquire(unsigned int minor_id)
if (!minor) {
return ERR_PTR(-ENODEV);
- } else if (drm_device_is_unplugged(minor->dev)) {
- drm_dev_unref(minor->dev);
- return ERR_PTR(-ENODEV);
}
return minor;
@@ -464,9 +461,6 @@ void drm_unplug_dev(struct drm_device *dev)
drm_minor_unregister(dev, DRM_MINOR_CONTROL);
mutex_lock(&drm_global_mutex);
-
- drm_device_set_unplugged(dev);
-
if (dev->open_count == 0) {
drm_put_dev(dev);
}
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 1ea8790..b4332d4 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -497,8 +497,6 @@ int drm_release(struct inode *inode, struct file *filp)
if (!--dev->open_count) {
retcode = drm_lastclose(dev);
- if (drm_device_is_unplugged(dev))
- drm_put_dev(dev);
}
mutex_unlock(&drm_global_mutex);
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 2e8c77e..c622e32 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -900,9 +900,6 @@ int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
struct drm_vma_offset_node *node;
int ret;
- if (drm_device_is_unplugged(dev))
- return -ENODEV;
-
drm_vma_offset_lock_lookup(dev->vma_offset_manager);
node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager,
vma->vm_pgoff,
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 8ce2a0c..f959074 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -695,9 +695,6 @@ long drm_ioctl(struct file *filp,
dev = file_priv->minor->dev;
- if (drm_device_is_unplugged(dev))
- return -ENODEV;
-
is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
if (is_driver_ioctl) {
diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
index f90bd5f..3a68be4 100644
--- a/drivers/gpu/drm/drm_vm.c
+++ b/drivers/gpu/drm/drm_vm.c
@@ -657,9 +657,6 @@ int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
struct drm_device *dev = priv->minor->dev;
int ret;
- if (drm_device_is_unplugged(dev))
- return -ENODEV;
-
mutex_lock(&dev->struct_mutex);
ret = drm_mmap_locked(filp, vma);
mutex_unlock(&dev->struct_mutex);
diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c
index 4709b54..b168f2c 100644
--- a/drivers/gpu/drm/udl/udl_connector.c
+++ b/drivers/gpu/drm/udl/udl_connector.c
@@ -96,7 +96,7 @@ static int udl_mode_valid(struct drm_connector *connector,
static enum drm_connector_status
udl_detect(struct drm_connector *connector, bool force)
{
- if (drm_device_is_unplugged(connector->dev))
+ if (udl_device_is_unplugged(connector->dev))
return connector_status_disconnected;
return connector_status_connected;
}
diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c
index d5728ec..3cbafe7 100644
--- a/drivers/gpu/drm/udl/udl_drv.c
+++ b/drivers/gpu/drm/udl/udl_drv.c
@@ -97,6 +97,7 @@ static void udl_usb_disconnect(struct usb_interface *interface)
drm_connector_unplug_all(dev);
udl_fbdev_unplug(dev);
udl_drop_usb(dev);
+ udl_device_set_unplugged(dev);
drm_unplug_dev(dev);
}
diff --git a/drivers/gpu/drm/udl/udl_drv.h b/drivers/gpu/drm/udl/udl_drv.h
index 4a064ef..61e117a 100644
--- a/drivers/gpu/drm/udl/udl_drv.h
+++ b/drivers/gpu/drm/udl/udl_drv.h
@@ -65,6 +65,7 @@ struct udl_device {
atomic_t bytes_identical; /* saved effort with backbuffer comparison */
atomic_t bytes_sent; /* to usb, after compression including overhead */
atomic_t cpu_kcycles_used; /* transpired during pixel processing */
+ atomic_t unplugged; /* device has been unplugged or gone away */
};
struct udl_gem_object {
@@ -140,6 +141,8 @@ int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
int width, int height);
int udl_drop_usb(struct drm_device *dev);
+void udl_device_set_unplugged(struct drm_device *dev);
+int udl_device_is_unplugged(struct drm_device *dev);
#define CMD_WRITE_RAW8 "\xAF\x60" /**< 8 bit raw write command. */
#define CMD_WRITE_RL8 "\xAF\x61" /**< 8 bit run length command. */
diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index 200419d..df1d53e 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -325,7 +325,7 @@ static int udl_fb_open(struct fb_info *info, int user)
struct udl_device *udl = dev->dev_private;
/* If the USB device is gone, we don't accept new opens */
- if (drm_device_is_unplugged(udl->ddev))
+ if (udl_device_is_unplugged(udl->ddev))
return -ENODEV;
ufbdev->fb_count++;
diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
index 33dbfb2..f6028a4 100644
--- a/drivers/gpu/drm/udl/udl_main.c
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -350,3 +350,18 @@ int udl_driver_unload(struct drm_device *dev)
kfree(udl);
return 0;
}
+
+void udl_device_set_unplugged(struct drm_device *dev)
+{
+ struct udl_device *udl = dev->dev_private;
+ smp_wmb();
+ atomic_set(&udl->unplugged, 1);
+}
+
+int udl_device_is_unplugged(struct drm_device *dev)
+{
+ struct udl_device *udl = dev->dev_private;
+ int ret = atomic_read(&udl->unplugged);
+ smp_rmb();
+ return ret;
+}
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index d7162cf..40c6099 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -748,7 +748,6 @@ struct drm_device {
struct drm_minor *control; /**< Control node */
struct drm_minor *primary; /**< Primary node */
struct drm_minor *render; /**< Render node */
- atomic_t unplugged; /**< Flag whether dev is dead */
struct inode *anon_inode; /**< inode for private address-space */
char *unique; /**< unique name of the device */
/*@} */
@@ -879,19 +878,6 @@ static __inline__ int drm_core_check_feature(struct drm_device *dev,
return ((dev->driver->driver_features & feature) ? 1 : 0);
}
-static inline void drm_device_set_unplugged(struct drm_device *dev)
-{
- smp_wmb();
- atomic_set(&dev->unplugged, 1);
-}
-
-static inline int drm_device_is_unplugged(struct drm_device *dev)
-{
- int ret = atomic_read(&dev->unplugged);
- smp_rmb();
- return ret;
-}
-
static inline bool drm_is_render_client(const struct drm_file *file_priv)
{
return file_priv->minor->type == DRM_MINOR_RENDER;
--
2.7.0.rc3.207.g0ac5344
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