gpu: nvgpu: fix invalid TSG pointer

In gr_gp10b_set_cilp_preempt_pending() we already extract TSG pointer
by calling tsg_gk20a_from_ch() which safely returns correct TSG or
NULL in error case

But before calling g->ops.fifo.post_event_id() we again extract TSG
by directly accessing g->fifo.tsg array, and this could result in
getting invalid TSG pointer

Fix this by removing direct TSG extraction through g->fifo.tsg

Bug 2444819
Jira NVGPU-1601

Change-Id: I9d49b5309c74e162828e7cb7d97556aae939a07c
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1984954
(cherry picked from commit dcd3778b5ea4e01ab1e5d2dab2b087b8da67b21e)
Reviewed-on: https://git-master.nvidia.com/r/2077313
Reviewed-by: Automatic_Commit_Validation_User
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, 0 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gp10b/gr_gp10b.c b/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
index 4d7c6d69..4b42678f 100644
--- a/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
+++ b/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
@@ -1801,8 +1801,6 @@ int gr_gp10b_set_cilp_preempt_pending(struct gk20a *g,
         gr_ctx->cilp_preempt_pending = true;
         g->gr.cilp_preempt_pending_chid = fault_ch->chid;
 
-        tsg = &g->fifo.tsg[fault_ch->tsgid];
-
         g->ops.fifo.post_event_id(tsg,
                                 NVGPU_EVENT_ID_CILP_PREEMPTION_STARTED);