gpu: nvgpu: fix channel reference leak in error case

In gr_gp10b_get_cilp_preempt_pending_chid(), we leak the channel
reference if tsg_gk20a_from_ch() returns NULL
Fix this by calling gk20a_channel_put() in error case

Bug 2444819
Jira NVGPU-1601

Change-Id: Ic5d036c6d043b0b95dd2a564afcc0add67c1ca02
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1984953
(cherry picked from commit 2322cb131c3478c1a7e3d8b29810f1c7001d4c44)
Reviewed-on: https://git-master.nvidia.com/r/2077312
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gp10b/gr_gp10b.c b/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
index 8d02c8f6..4d7c6d69 100644
--- a/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
+++ b/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
@@ -1969,6 +1969,7 @@ static int gr_gp10b_get_cilp_preempt_pending_chid(struct gk20a *g, int *__chid)
 
         tsg = tsg_gk20a_from_ch(ch);
         if (!tsg) {
+                gk20a_channel_put(ch);
                 return -EINVAL;
         }