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During VM guest reset GPU interrupts were triggered after the corresponding channel has been disabled. This leads to a NULL-Ptr access in fecs error handling. This change removes the access to invalid ch->chid. Bug 3362082 Change-Id: I2d51a62ec47a07ae7ea90394fec76d3c3a8d186c Signed-off-by: Thomas Steinle <tsteinle@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2590478 (cherry picked from commit b1b04915bfad7060479624d5ec85894c6bac3ba6) Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2596201 Reviewed-by: Phoenix Jung <pjung@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>