gpu: nvgpu: fix tsg unbind failure paths

nvgpu_tsg_unbind_channel_common failure handling missed
channel.clear & nvgpu_tsg_set_mmu_debug_mode calls.

Bug 200711183

Change-Id: I19fd53be55db9df725b7cf467b2673e4cd29deb5
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2521972
(cherry picked from commit 89ec2afbd4538fe5036bef7affed5871d45ec734)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2524251
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/fifo/tsg.c b/drivers/gpu/nvgpu/common/fifo/tsg.c
index ebcdd2be..72ef9304 100644
--- a/drivers/gpu/nvgpu/common/fifo/tsg.c
+++ b/drivers/gpu/nvgpu/common/fifo/tsg.c
@@ -172,6 +172,15 @@ int gk20a_tsg_unbind_channel(struct channel_gk20a *ch, bool force)
                 /* If channel unbind fails, channel is still part of runlist */
                 channel_gk20a_update_runlist(ch, false);
 
+                while (ch->mmu_debug_mode_refcnt > 0U) {
+                        err = nvgpu_tsg_set_mmu_debug_mode(ch, false);
+                        if (err != 0) {
+                                nvgpu_err(g, "disable mmu debug mode failed ch:%u",
+                                        ch->chid);
+                                break;
+                        }
+                }
+
                 nvgpu_rwsem_down_write(&tsg->ch_list_lock);
                 nvgpu_list_del(&ch->ch_entry);
                 ch->tsgid = NVGPU_INVALID_TSG_ID;