gpu: nvgpu: EAGAIN when priv_cmd buf is full

When the priv_cmd buffer is full, return EAGAIN to userspace,
so it may retry to submit ioctl.

Bug 1795076

Change-Id: I0752d52b677aaf915e8e472bec6140e14c885589
Signed-off-by: Sachit Kadle <skadle@nvidia.com>
Reviewed-on: http://git-master/r/1213586
(cherry picked from commit fc6b23559a839620accd5bbd2957e69310b87a5b)
Reviewed-on: http://git-master/r/1229488
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 09116a88..5dac72e5 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -1376,7 +1376,7 @@ int gk20a_channel_alloc_priv_cmdbuf(struct channel_gk20a *c, u32 orig_size,
         free_count = (q->size - (q->put - q->get) - 1) % q->size;
 
         if (size > free_count)
-                return -ENOSPC;
+                return -EAGAIN;
 
         e = kzalloc(sizeof(struct priv_cmd_entry), GFP_KERNEL);
         if (!e) {