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drm/nouveau: call ttm_bo_wait with the bo lock held to prevent hang 

nouveau_gem_ioctl_cpu_prep calls ttm_bo_wait without the bo lock held.
ttm_bo_wait unlocks that lock, and so must be called with it held.

Currently this bug causes libdrm nouveau_bo_busy() to hang the machine.

Signed-off-by: Luca Barbieri <luca at luca-barbieri.com>
Acked-by: Maarten Maathuis <madman2003@gmail.com>
Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Luca Barbieri 2010-01-30 23:21:38 +01:00 committed by Ben Skeggs
parent 139295b671
commit f0fbe3eb5f
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/nouveau/nouveau_gem.c
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@ -925,7 +925,9 @@ nouveau_gem_ioctl_cpu_prep(struct drm_device *dev, void *data,
}
if (req->flags & NOUVEAU_GEM_CPU_PREP_NOBLOCK) {
spin_lock(&nvbo->bo.lock);
ret = ttm_bo_wait(&nvbo->bo, false, false, no_wait);
spin_unlock(&nvbo->bo.lock);
} else {
ret = ttm_bo_synccpu_write_grab(&nvbo->bo, no_wait);
if (ret == 0)