[PATCH] drm/nouveau/dmem: missing mutex_lock in error path

Ralph Campbell
2019-06-14T00:12:08Z

In nouveau_dmem_pages_alloc(), the drm->dmem->mutex is unlocked before
calling nouveau_dmem_chunk_alloc().
Reacquire the lock before continuing to the next page.

Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
---

I found this while testing Jason Gunthorpe's hmm tree but this is
independant of those changes. I guess it could go through
David Airlie's tree for nouveau or Jason's tree.

drivers/gpu/drm/nouveau/nouveau_dmem.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
index 27aa4e72abe9..00f7236af1b9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -379,9 +379,10 @@ nouveau_dmem_pages_alloc(struct nouveau_drm *drm,
ret = nouveau_dmem_chunk_alloc(drm);
if (ret) {
if (c)
- break;
+ return 0;
return ret;
}
+ mutex_lock(&drm->dmem->mutex);
continue;
}

--
2.20.1