From 547033b593063eb85bfdf9b25a5f1b8fd1911be2 Mon Sep 17 00:00:00 2001 From: "Lin.Cao" Date: Wed, 24 Apr 2024 11:27:16 +0800 Subject: [PATCH] drm/amdkfd: Check debug trap enable before write dbg_ev_file In interrupt context, write dbg_ev_file will be run by work queue. It will cause write dbg_ev_file execution after debug_trap_disable, which will cause NULL pointer access. v2: cancel work "debug_event_workarea" before set dbg_ev_file as NULL. Signed-off-by: Lin.Cao Reviewed-by: Jonathan Kim Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdkfd/kfd_debug.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_debug.c b/drivers/gpu/drm/amd/amdkfd/kfd_debug.c index 45b1975b149a..3f27bab7a502 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_debug.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_debug.c @@ -104,7 +104,8 @@ void debug_event_write_work_handler(struct work_struct *work) struct kfd_process, debug_event_workarea); - kernel_write(process->dbg_ev_file, &write_data, 1, &pos); + if (process->debug_trap_enabled && process->dbg_ev_file) + kernel_write(process->dbg_ev_file, &write_data, 1, &pos); } /* update process/device/queue exception status, write to descriptor @@ -656,6 +657,7 @@ int kfd_dbg_trap_disable(struct kfd_process *target) else if (target->runtime_info.runtime_state != DEBUG_RUNTIME_STATE_DISABLED) target->runtime_info.runtime_state = DEBUG_RUNTIME_STATE_ENABLED; + cancel_work_sync(&target->debug_event_workarea); fput(target->dbg_ev_file); target->dbg_ev_file = NULL; -- 2.25.1