Fwd: Re: drmkms panic

[Stefan Hertenberger <Stefan@Hertenberger.bayern>]

---

Von: Stefan Hertenberger <stefan@hertenberger.bayern>
Gesendet: 5. August 2016 22:46:31 MESZ
An: coypu%sdf.org@localhost
Betreff: Re: drmkms panic

Am , schrieb coypu%SDF.ORG@localhost:
 
 
 The problem is pretty obvious. netbsd kmem_alloc doesn't like 
 allocating
 zero-sized things, whereas linux kmalloc does.
 
 Now for patching the code to return a sane value provided a zero 
 size...

i did a bit of testing and add a little patch,

Index: dist/drm/drm_gem.c

RCS file: /cvsroot/src/sys/external/bsd/drm2/dist/drm/drm_gem.c,v
retrieving revision 1.5
diff -u -r1.5 drm_gem.c
--- dist/drm/drm_gem.c	18 Aug 2014 01:21:03 -0000	1.5
+++ dist/drm/drm_gem.c	5 Aug 2016 20:45:48 -0000
@@ -154,6 +154,7 @@
  	drm_gem_private_object_init(dev, obj, size);

  #ifdef __NetBSD__
+	if (size == 0) return 0;
  	obj->gemo_shm_uao = uao_create(size, 0);
  	/*
  	 * X
 XX This
is gross.  We ought to do it the other way around:


this doesn't fix the the issue but the panic is gone and now i get

DRM error in radeon_gem_object_create: Failed to allocate GEM object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_create: Failed to allocate GEM object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_create: Failed to allocate GEM object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_create: Failed to allocate GEM object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_create: Failed to allocate GEM object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_cre
 ate:
Failed to allocate GEM object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_create: Failed to allocate GEM object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_create: Failed to allocate GEM object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_create: Failed to allocate GEM object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_create: Failed to allocate GEM object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_create: Failed to allocate GEM object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_create: Failed to allocate
  GEM
object (0, 
6, 4096, -22)
Illegal buffer object size
Illegal buffer object size
DRM error in radeon_gem_object_create: Failed to allocate GEM object (0, 
6, 4096, -22)

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