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Currently we call function hisi_sas_debugfs_exit() to remove debugfs_dir before freeing interrupt irqs and destroying workqueue in the driver remove path. If a dump is triggered before function hisi_sas_debugfs_exit() but debugfs_work may be called after it, so it may refer to already removed debugfs_dir which will cause NULL pointer dereference. To avoid it, put function hisi_sas_debugfs_exit() after free_irqs and destroy workqueue when removing hisi_sas driver. Link: https://lore.kernel.org/r/1573551059-107873-4-git-send-email-john.garry@huawei.com Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com> Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>