drm/msm: Return ERR_PTR() from submit_create()

In the next patch, we start having more than a single potential failure
reason.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20210728010632.2633470-9-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index f6f595a..f570155 100644 (file)
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -32,30 +32,27 @@ static struct msm_gem_submit *submit_create(struct drm_device *dev,
                uint32_t nr_cmds)
 {
        struct msm_gem_submit *submit;
-       uint64_t sz = struct_size(submit, bos, nr_bos) +
-                                 ((u64)nr_cmds * sizeof(submit->cmd[0]));
+       uint64_t sz;
+
+       sz = struct_size(submit, bos, nr_bos) +
+                       ((u64)nr_cmds * sizeof(submit->cmd[0]));
 
        if (sz > SIZE_MAX)
-               return NULL;
+               return ERR_PTR(-ENOMEM);
 
-       submit = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
+       submit = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
        if (!submit)
-               return NULL;
+               return ERR_PTR(-ENOMEM);
 
        kref_init(&submit->ref);
        submit->dev = dev;
        submit->aspace = queue->ctx->aspace;
        submit->gpu = gpu;
-       submit->fence = NULL;
        submit->cmd = (void *)&submit->bos[nr_bos];
        submit->queue = queue;
        submit->ring = gpu->rb[queue->prio];
        submit->fault_dumped = false;
 
-       /* initially, until copy_from_user() and bo lookup succeeds: */
-       submit->nr_bos = 0;
-       submit->nr_cmds = 0;
-
        INIT_LIST_HEAD(&submit->node);
        INIT_LIST_HEAD(&submit->bo_list);
 
@@ -799,8 +796,8 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 
        submit = submit_create(dev, gpu, queue, args->nr_bos,
                args->nr_cmds);
-       if (!submit) {
-               ret = -ENOMEM;
+       if (IS_ERR(submit)) {
+               ret = PTR_ERR(submit);
                goto out_unlock;
        }