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drm/amdkfd: Destroy KFD debugfs after destroy KFD wq 

Since KFD proc content was moved to kernel debugfs, we can't destroy KFD
debugfs before kfd_process_destroy_wq. Move kfd_process_destroy_wq prior
to kfd_debugfs_fini to fix a kernel NULL pointer problem. It happens
when /sys/kernel/debug/kfd was already destroyed in kfd_debugfs_fini but
kfd_process_destroy_wq calls kfd_debugfs_remove_process. This line
    debugfs_remove_recursive(entry->proc_dentry);
tries to remove /sys/kernel/debug/kfd/proc/<pid> while
/sys/kernel/debug/kfd is already gone. It hangs the kernel by kernel
NULL pointer.

Signed-off-by: Amber Lin <Amber.Lin@amd.com>
Reviewed-by: Eric Huang <jinhuieric.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 0333052d90)
Cc: stable@vger.kernel.org
This commit is contained in:
Amber Lin 2025-07-31 20:45:00 -04:00 committed by Alex Deucher
parent 928587381b
commit 2e58401a24
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdkfd/kfd_module.c
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@ -78,8 +78,8 @@ static int kfd_init(void)
static void kfd_exit(void)
{
kfd_cleanup_processes();
kfd_debugfs_fini();
kfd_process_destroy_wq();
kfd_debugfs_fini();
kfd_procfs_shutdown();
kfd_topology_shutdown();
kfd_chardev_exit();