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scsi: lpfc: Fix debugfs root inode "lpfc" not getting deleted on driver unload.

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When unloading and reloading the driver, the driver fails to recreate
the lpfc root inode in the debugfs tree.

The driver is incorrectly removing the lpfc root inode in
lpfc_debugfs_terminate in the first driver instance that unloads and
then sets the lpfc_debugfs_root global parameter to NULL.  When the
final driver instance unloads, the debugfs calls quietly ignore the
remove on a NULL pointer.  The bug is that the debugfs_remove call
returns void so the driver doesn't know to correctly set the global
parameter to NULL.

Base the debugfs_remove of the lpfc_debugfs_root parameter on
lpfc_debugfs_hba_count because this parameter tracks the fnX instance
tracked per driver instance.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart 2017-05-15 15:20:48 -07:00 committed by Martin K. Petersen
parent 82820f0cf1
commit 667a766252
1 changed files with 4 additions and 2 deletions
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6
drivers/scsi/lpfc/lpfc_debugfs.c
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@ -5866,8 +5866,10 @@ lpfc_debugfs_terminate(struct lpfc_vport *vport)
atomic_dec(&lpfc_debugfs_hba_count);
}
debugfs_remove(lpfc_debugfs_root); /* lpfc */
lpfc_debugfs_root = NULL;
if (atomic_read(&lpfc_debugfs_hba_count) == 0) {
debugfs_remove(lpfc_debugfs_root); /* lpfc */
lpfc_debugfs_root = NULL;
}
}
#endif
return;