linux-kernel - [PATCH] drm: fix sysfs symlinks between driver and module

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Date:	Fri,  6 Mar 2015 21:58:48 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm: fix sysfs symlinks between driver and module

When registering drivers, the symlinks for mapping between driver
and module are created in sysfs.  But the drm drivers registered
by drm_pci_init() create wrong symlinks, because correct owner
module of pci driver is not passed to pci_register_driver().

For example, the i915 driver creates the following wrong symlinks:

/sys/bus/pci/drivers/i915/module -> ../../../../module/drm
/sys/module/drm/drivers/pci:i915 -> ../../../bus/pci/drivers/i915

With this change, these symlinks are fixed:

/sys/bus/pci/drivers/i915/module -> ../../../../module/i915
/sys/module/i915/drivers/pci:i915 -> ../../../bus/pci/drivers/i915

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: David Airlie <airlied@...ux.ie>
Cc: dri-devel@...ts.freedesktop.org
---
 drivers/gpu/drm/drm_pci.c | 14 +++++++++-----
 include/drm/drmP.h        |  5 ++++-
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
index fd29f03..e093a11 100644
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -318,16 +318,19 @@ err_free:
 EXPORT_SYMBOL(drm_get_pci_dev);
 
 /**
- * drm_pci_init - Register matching PCI devices with the DRM subsystem
+ * __drm_pci_init - Register matching PCI devices with the DRM subsystem
  * @driver: DRM device driver
  * @pdriver: PCI device driver
+ * @owner: owner module of pdriver
+ * @mod_name: module name string
  *
  * Initializes a drm_device structures, registering the stubs and initializing
  * the AGP device.
  *
  * Return: 0 on success or a negative error code on failure.
  */
-int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
+int __drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver,
+		   struct module *owner, const char *mod_name)
 {
 	struct pci_dev *pdev = NULL;
 	const struct pci_device_id *pid;
@@ -336,7 +339,7 @@ int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 	DRM_DEBUG("\n");
 
 	if (driver->driver_features & DRIVER_MODESET)
-		return pci_register_driver(pdriver);
+		return __pci_register_driver(pdriver, owner, mod_name);
 
 	/* If not using KMS, fall back to stealth mode manual scanning. */
 	INIT_LIST_HEAD(&driver->legacy_dev_list);
@@ -404,7 +407,8 @@ EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
 
 #else
 
-int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
+int __drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver,
+		   struct module *owner, const char *mod_name)
 {
 	return -1;
 }
@@ -425,7 +429,7 @@ int drm_pci_set_unique(struct drm_device *dev,
 }
 #endif
 
-EXPORT_SYMBOL(drm_pci_init);
+EXPORT_SYMBOL(__drm_pci_init);
 
 /**
  * drm_pci_exit - Unregister matching PCI devices from the DRM subsystem
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index e928625..8a06d9d 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1034,7 +1034,10 @@ static __inline__ int drm_pci_device_is_agp(struct drm_device *dev)
 }
 void drm_pci_agp_destroy(struct drm_device *dev);
 
-extern int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver);
+extern int __drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver,
+			  struct module *owner, const char *mod_name);
+#define drm_pci_init(driver, pdriver) \
+	__drm_pci_init(driver, pdriver, THIS_MODULE, KBUILD_MODNAME)
 extern void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver);
 #ifdef CONFIG_PCI
 extern int drm_get_pci_dev(struct pci_dev *pdev,
-- 
1.9.1

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