drm/xe: Drop VM dma-resv lock on xe_sync_in_fence_get failure in exec…

… IOCTL

Upon failure all locks need to be dropped before returning to the user.

Fixes: 58480c1 ("drm/xe: Skip VMAs pin when requesting signal to the last XE_EXEC")
Cc: <stable@vger.kernel.org>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241105043524.4062774-3-matthew.brost@intel.com

drivers/gpu/drm/xe/xe_exec.c

@@ -224,6 +224,7 @@ int xe_exec_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
 			fence = xe_sync_in_fence_get(syncs, num_syncs, q, vm);
 			if (IS_ERR(fence)) {
 				err = PTR_ERR(fence);
+				xe_vm_unlock(vm);
 				goto err_unlock_list;
 			}
 			for (i = 0; i < num_syncs; i++)