drm: use noop_llseek

The drm device drivers currently allow seeking on the
character device but never care about the actual
file position.

When we change the default llseek operation to be
no_llseek, calling llseek on a drm device would
return an error condition, which is an API change.

Explicitly setting noop_llseek lets us keep the
current API.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org

Documentation/DocBook/drm.tmpl

@@ -136,6 +136,7 @@
 #ifdef CONFIG_COMPAT
 		.compat_ioctl = i915_compat_ioctl,
 #endif
+		.llseek = noop_llseek,
 		},
 	.pci_driver = {
 		.name = DRIVER_NAME,

drivers/gpu/drm/i810/i810_drv.c

@@ -63,6 +63,7 @@ static struct drm_driver driver = {
 		 .mmap = drm_mmap,
 		 .poll = drm_poll,
 		 .fasync = drm_fasync,
+		 .llseek = noop_llseek,
 	},
 
 	.pci_driver = {

drivers/gpu/drm/i830/i830_drv.c

@@ -74,6 +74,7 @@ static struct drm_driver driver = {
 		 .mmap = drm_mmap,
 		 .poll = drm_poll,
 		 .fasync = drm_fasync,
+		 .llseek = noop_llseek,
 	},
 
 	.pci_driver = {

drivers/gpu/drm/i915/i915_drv.c

@@ -547,6 +547,7 @@ static struct drm_driver driver = {
 #ifdef CONFIG_COMPAT
 		 .compat_ioctl = i915_compat_ioctl,
 #endif
+		 .llseek = noop_llseek,
 	},
 
 	.pci_driver = {

drivers/gpu/drm/mga/mga_drv.c

@@ -75,6 +75,7 @@ static struct drm_driver driver = {
 #ifdef CONFIG_COMPAT
 		.compat_ioctl = mga_compat_ioctl,
 #endif
+		.llseek = noop_llseek,
 	},
 	.pci_driver = {
 		.name = DRIVER_NAME,

drivers/gpu/drm/nouveau/nouveau_drv.c

@@ -393,6 +393,7 @@ static struct drm_driver driver = {
 #if defined(CONFIG_COMPAT)
 		.compat_ioctl = nouveau_compat_ioctl,
 #endif
+		.llseek = noop_llseek,
 	},
 	.pci_driver = {
 		.name = DRIVER_NAME,

drivers/gpu/drm/r128/r128_drv.c

@@ -71,6 +71,7 @@ static struct drm_driver driver = {
 #ifdef CONFIG_COMPAT
 		.compat_ioctl = r128_compat_ioctl,
 #endif
+		.llseek = noop_llseek,
 	},
 	.pci_driver = {
 		.name = DRIVER_NAME,

drivers/gpu/drm/radeon/radeon_drv.c

@@ -219,6 +219,7 @@ static struct drm_driver driver_old = {
 #ifdef CONFIG_COMPAT
 		 .compat_ioctl = radeon_compat_ioctl,
 #endif
+		 .llseek = noop_llseek,
 	},
 
 	.pci_driver = {

drivers/gpu/drm/savage/savage_drv.c

@@ -54,6 +54,7 @@ static struct drm_driver driver = {
 		 .mmap = drm_mmap,
 		 .poll = drm_poll,
 		 .fasync = drm_fasync,
+		 .llseek = noop_llseek,
 	},
 
 	.pci_driver = {

drivers/gpu/drm/sis/sis_drv.c

@@ -83,6 +83,7 @@ static struct drm_driver driver = {
 		 .mmap = drm_mmap,
 		 .poll = drm_poll,
 		 .fasync = drm_fasync,
+		 .llseek = noop_llseek,
 	},
 	.pci_driver = {
 		 .name = DRIVER_NAME,

drivers/gpu/drm/tdfx/tdfx_drv.c

@@ -52,6 +52,7 @@ static struct drm_driver driver = {
 		 .mmap = drm_mmap,
 		 .poll = drm_poll,
 		 .fasync = drm_fasync,
+		 .llseek = noop_llseek,
 	},
 	.pci_driver = {
 		 .name = DRIVER_NAME,

drivers/gpu/drm/via/via_drv.c

@@ -62,6 +62,7 @@ static struct drm_driver driver = {
 		.mmap = drm_mmap,
 		.poll = drm_poll,
 		.fasync = drm_fasync,
+		.llseek = noop_llseek,
 		},
 	.pci_driver = {
 		.name = DRIVER_NAME,

drivers/gpu/drm/vmwgfx/vmwgfx_drv.c

@@ -745,6 +745,7 @@ static struct drm_driver driver = {
 #if defined(CONFIG_COMPAT)
 		 .compat_ioctl = drm_compat_ioctl,
 #endif
+		 .llseek = noop_llseek,
 		 },
 	.pci_driver = {
 		       .name = VMWGFX_DRIVER_NAME,