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drm: make sure the drawable code doesn't call malloc(0). 

Signed-off-by: Michel Dänzer <michel@tungstengraphics.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
This commit is contained in:
Michel Dänzer 2007-05-26 04:37:08 +10:00 committed by Dave Airlie
parent 777c7738a5
commit c4814f9001
1 changed files with 26 additions and 15 deletions
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41
drivers/char/drm/drm_drawable.c
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@ -172,38 +172,49 @@ int drm_rmdraw(DRM_IOCTL_ARGS)
bitfield_length = idx + 1;
if (idx != id / (8 * sizeof(*bitfield)))
bitfield = drm_alloc(bitfield_length *
sizeof(*bitfield), DRM_MEM_BUFS);
bitfield = NULL;
if (!bitfield && bitfield_length) {
bitfield = dev->drw_bitfield;
bitfield_length = dev->drw_bitfield_length;
if (bitfield_length) {
if (bitfield_length != dev->drw_bitfield_length)
bitfield = drm_alloc(bitfield_length *
sizeof(*bitfield),
DRM_MEM_BUFS);
if (!bitfield) {
bitfield = dev->drw_bitfield;
bitfield_length = dev->drw_bitfield_length;
}
}
}
if (bitfield != dev->drw_bitfield) {
info_length = 8 * sizeof(*bitfield) * bitfield_length;
info = drm_alloc(info_length * sizeof(*info), DRM_MEM_BUFS);
if (info_length) {
info = drm_alloc(info_length * sizeof(*info),
DRM_MEM_BUFS);
if (!info && info_length) {
info = dev->drw_info;
info_length = dev->drw_info_length;
}
if (!info) {
info = dev->drw_info;
info_length = dev->drw_info_length;
}
} else
info = NULL;
spin_lock_irqsave(&dev->drw_lock, irqflags);
memcpy(bitfield, dev->drw_bitfield, bitfield_length *
sizeof(*bitfield));
if (bitfield)
memcpy(bitfield, dev->drw_bitfield, bitfield_length *
sizeof(*bitfield));
drm_free(dev->drw_bitfield, sizeof(*bitfield) *
dev->drw_bitfield_length, DRM_MEM_BUFS);
dev->drw_bitfield = bitfield;
dev->drw_bitfield_length = bitfield_length;
if (info != dev->drw_info) {
memcpy(info, dev->drw_info, info_length *
sizeof(*info));
if (info)
memcpy(info, dev->drw_info, info_length *
sizeof(*info));
drm_free(dev->drw_info, sizeof(*info) *
dev->drw_info_length, DRM_MEM_BUFS);
dev->drw_info = info;