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ce8548ec05
clk_arb completion file descriptor can get closed immediately after poll finishes in the work item gp10b_clk_arb_run_arbiter_cb. In that case, the refcount for nvgpu_clk_dev can become zero in the work item and can lead to invalid access while removing nvgpu_clk_dev from the lists. Remove nvgpu_clk_dev from the list before dropping the reference to it. Also, delete the nvgpu_clk_dev in completion file release handler within the session and requests spinlocks to avoid race with gp10b_clk_arb_run_arbiter_cb using it. bug 200757277 Change-Id: I054eee547f2a6fa633d7ef55df216ec36647a826 Signed-off-by: Sagar Kamble <skamble@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2569522 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: Debarshi Dutta <ddutta@nvidia.com> Reviewed-by: Deepak Nibade <dnibade@nvidia.com> Reviewed-by: Bibek Basu <bbasu@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>