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da58405860
linux/drivers/gpu/drm
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Chris Wilson da58405860 drm: Return ENODEV if the inode mapping changes 
Replace a BUG_ON with an error code in the event that the inode mapping
changes between calls to drm_open. This may happen for instance if udev
is loaded subsequent to the original opening of the device:

[  644.291870] kernel BUG at drivers/gpu/drm/drm_fops.c:146!
[  644.291876] invalid opcode: 0000 [#1] SMP
[  644.291882] last sysfs file: /sys/kernel/uevent_seqnum
[  644.291888]
[  644.291895] Pid: 7276, comm: lt-cairo-test-s Not tainted 2.6.34-rc1 #2 N150/N210/N220             /N150/N210/N220
[  644.291903] EIP: 0060:[<c11c70e3>] EFLAGS: 00210283 CPU: 0
[  644.291912] EIP is at drm_open+0x4b1/0x4e2
[  644.291918] EAX: f72d8d18 EBX: f790a400 ECX: f73176b8 EDX: 00000000
[  644.291923] ESI: f790a414 EDI: f790a414 EBP: f647ae20 ESP: f647adfc
[  644.291929]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[  644.291937] Process lt-cairo-test-s (pid: 7276, ti=f647a000 task=f73f5c80 task.ti=f647a000)
[  644.291941] Stack:
[  644.291945]  00000000 f7bb7400 00000080 f6451100 f73176b8 f6479214 f6451100 f73176b8
[  644.291957] <0> c1297ce0 f647ae34 c11c6c04 f73176b8 f7949800 00000000 f647ae54 c1080ac5
[  644.291969] <0> f7949800 f6451100 00000000 f6451100 f73176b8 f6452780 f647ae70 c107d1e6
[  644.291982] Call Trace:
[  644.291991]  [<c11c6c04>] ? drm_stub_open+0x8a/0xb8
[  644.292000]  [<c1080ac5>] ? chrdev_open+0xef/0x106
[  644.292008]  [<c107d1e6>] ? __dentry_open+0xd4/0x1a6
[  644.292015]  [<c107d35b>] ? nameidata_to_filp+0x31/0x45
[  644.292022]  [<c10809d6>] ? chrdev_open+0x0/0x106
[  644.292030]  [<c10864e2>] ? do_last+0x346/0x423
[  644.292037]  [<c108789f>] ? do_filp_open+0x190/0x415
[  644.292046]  [<c1071eb5>] ? handle_mm_fault+0x214/0x710
[  644.292053]  [<c107d008>] ? do_sys_open+0x4d/0xe9
[  644.292061]  [<c1016462>] ? do_page_fault+0x211/0x23f
[  644.292068]  [<c107d0f0>] ? sys_open+0x23/0x2b
[  644.292075]  [<c1002650>] ? sysenter_do_call+0x12/0x26
[  644.292079] Code: 89 f0 89 55 dc e8 8d 96 0a 00 8b 45 e0 8b 55 dc 83 78 04 01 75 28 8b 83 18 02 00 00 85 c0 74 0f 8b 4d ec 3b 81 ac 00 00 00 74 13 <0f> 0b eb fe 8b 4d ec 8b 81 ac 00 00 00 89 83 18 02 00 00 89 f0
[  644.292143] EIP: [<c11c70e3>] drm_open+0x4b1/0x4e2 SS:ESP 0068:f647adfc
[  644.292175] ---[ end trace 2ddd476af89a60fa ]---

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-03-31 13:12:00 +10:00
..
i2c drm/i2c/ch7006: Fix load detection false positives right after system init. 2009-12-16 17:04:45 +10:00
i810 drm: convert drm_ioctl to unlocked_ioctl 2009-12-18 11:22:31 +10:00
i830 drm: convert drm_ioctl to unlocked_ioctl 2009-12-18 11:22:31 +10:00
i915 Merge branch 'gpu-switcher' of /ssd/git//linux-2.6 into drm-next-stage 2010-03-01 16:22:38 +10:00
mga drm: convert drm_ioctl to unlocked_ioctl 2009-12-18 11:22:31 +10:00
nouveau Merge remote branch 'nouveau/for-airlied' into drm-linus 2010-03-15 11:07:33 +10:00
r128 drm: convert drm_ioctl to unlocked_ioctl 2009-12-18 11:22:31 +10:00
radeon drm/radeon/kms: Fix NULL pointer dereference if memory allocation failed. 2010-03-31 13:11:53 +10:00
savage drm: convert drm_ioctl to unlocked_ioctl 2009-12-18 11:22:31 +10:00
sis drm: convert drm_ioctl to unlocked_ioctl 2009-12-18 11:22:31 +10:00
tdfx drm: convert drm_ioctl to unlocked_ioctl 2009-12-18 11:22:31 +10:00
ttm drm: "kobject_init/kobject_add" -> "kobject_init_and_add". 2010-03-15 10:32:09 +10:00
via drm: convert drm_ioctl to unlocked_ioctl 2009-12-18 11:22:31 +10:00
vmwgfx drm/vmwgfx: depends on FB 2010-03-15 10:35:04 +10:00
ati_pcigart.c ati_pcigart: fix printk format warning 2010-02-05 11:46:48 +10:00
drm_agpsupport.c agp: switch AGP to use page array instead of unsigned long array 2009-06-19 10:21:42 +10:00
drm_auth.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_buffer.c drm: Add generic multipart buffer. 2010-02-23 09:46:20 +10:00
drm_bufs.c drm: remove address mask param for drm_pci_alloc() 2010-01-07 13:15:50 +10:00
drm_cache.c drm: fix drm_cache.c for arch with no support. 2009-09-02 09:41:13 +10:00
drm_context.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_crtc_helper.c drm: remove the EDID blob stored in the EDID property when it is disconnected 2010-03-15 10:36:21 +10:00
drm_crtc.c Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2010-01-11 09:46:20 -08:00
drm_debugfs.c drm: drm_debugfs, check kmalloc retval 2009-07-15 15:55:37 +10:00
drm_dma.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_dp_i2c_helper.c Merge remote branch 'anholt/drm-intel-next' into drm-linus 2009-12-08 14:03:47 +10:00
drm_drawable.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_drv.c drm: switch all GEM/KMS ioctls to unlocked ioctl status. 2010-02-11 14:25:18 +10:00
drm_edid.c drm/edid: allow certain bogus edids to hit a fixup path rather than fail 2010-03-15 10:58:17 +10:00
drm_encoder_slave.c drm: fixup include file in drm_encoder_slave 2009-08-13 13:31:54 +10:00
drm_fb_helper.c drm/kms: fix spelling of "CLOCK" 2010-02-11 14:31:32 +10:00
drm_fops.c drm: Return ENODEV if the inode mapping changes 2010-03-31 13:12:00 +10:00
drm_gem.c Use drm_gem_object_[handle_]unreference_unlocked where possible 2010-02-11 14:22:34 +10:00
drm_hashtab.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_info.c
drm_ioc32.c drm: convert drm_ioctl to unlocked_ioctl 2009-12-18 11:22:31 +10:00
drm_ioctl.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_irq.c drm: Avoid calling vblank function is vblank wasn't initialized 2010-01-08 13:12:09 +10:00
drm_lock.c
drm_memory.c agp: switch AGP to use page array instead of unsigned long array 2009-06-19 10:21:42 +10:00
drm_mm.c drm: Fix a bug in the range manager. 2010-02-15 11:19:14 +10:00
drm_modes.c lib: Introduce generic list_sort function 2010-01-12 21:02:00 -08:00
drm_pci.c drm: remove address mask param for drm_pci_alloc() 2010-01-07 13:15:50 +10:00
drm_proc.c drm: use proc_create_data() 2009-08-31 09:37:22 +10:00
drm_scatter.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_sman.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_stub.c drm: Export symbols needed for the vmwgfx driver. 2009-12-07 15:22:08 +10:00
drm_sysfs.c Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2009-09-21 08:10:09 -07:00
drm_vm.c const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
Kconfig drm/radeon/kms: move radeon KMS on/off switch out of staging. 2010-02-01 11:35:47 +10:00
Makefile drm: Add generic multipart buffer. 2010-02-23 09:46:20 +10:00
README.drm

README.drm 

************************************************************
* For the very latest on DRI development, please see:      *
*     http://dri.freedesktop.org/                          *
************************************************************

The Direct Rendering Manager (drm) is a device-independent kernel-level
device driver that provides support for the XFree86 Direct Rendering
Infrastructure (DRI).

The DRM supports the Direct Rendering Infrastructure (DRI) in four major
ways:

    1. The DRM provides synchronized access to the graphics hardware via
       the use of an optimized two-tiered lock.

    2. The DRM enforces the DRI security policy for access to the graphics
       hardware by only allowing authenticated X11 clients access to
       restricted regions of memory.

    3. The DRM provides a generic DMA engine, complete with multiple
       queues and the ability to detect the need for an OpenGL context
       switch.

    4. The DRM is extensible via the use of small device-specific modules
       that rely extensively on the API exported by the DRM module.


Documentation on the DRI is available from:
    http://dri.freedesktop.org/wiki/Documentation
    http://sourceforge.net/project/showfiles.php?group_id=387
    http://dri.sourceforge.net/doc/

For specific information about kernel-level support, see:

    The Direct Rendering Manager, Kernel Support for the Direct Rendering
    Infrastructure
    http://dri.sourceforge.net/doc/drm_low_level.html

    Hardware Locking for the Direct Rendering Infrastructure
    http://dri.sourceforge.net/doc/hardware_locking_low_level.html

    A Security Analysis of the Direct Rendering Infrastructure
    http://dri.sourceforge.net/doc/security_low_level.html