gpu: nvgpu: allocator: release semaphore on error

Release rw_sema properly when block allocator runs out of memory and
returns error.

Change-Id: I6b7cf9564ae25ad1ba30edfcb1ae8a20cf7dc9db
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/601792
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c b/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
index b404799f..0b5f9f6f 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
@@ -89,8 +89,10 @@ int gk20a_allocator_block_alloc(struct gk20a_allocator *allocator,
                         len,
                         allocator->align - 1);
         if ((_addr > allocator->limit - allocator->base + 1) ||
-            (*addr && *addr != (_addr + allocator->base)))
+            (*addr && *addr != (_addr + allocator->base))) {
+                up_write(&allocator->rw_sema);
                 return -ENOMEM;
+        }
 
         bitmap_set(allocator->bitmap, _addr, len);
         *addr = allocator->base + _addr;