6.6-stable review patch. If anyone has any objections, please let me know.
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From: Amber Lin Amber.Lin@amd.com
commit 2e58401a24e7b2d4ec619104e1a76590c1284a4c upstream.
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 0333052d90683d88531558dcfdbf2525cc37c233) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/amdkfd/kfd_module.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_module.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_module.c @@ -78,8 +78,8 @@ err_ioctl: 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();