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scsi: zfcp: Fix sysfs roll-back on error in zfcp_adapter_enqueue() 

When zfcp_adapter_enqueue() fails to create the zfcp_sysfs_adapter_attrs
group, it calls zfcp_adapter_unregister() to tear down the adapter state
again. This then unconditionally attempts to remove the
zfcp_sysfs_adapter_attrs group, resulting in a "group not found" WARN from
sysfs code.

Avoid this by copying most of zfcp_adapter_unregister() into the error
path, allowing for more fine-granular roll-back. Then skip the sysfs
tear-down steps if we haven't progressed this far in the initialization.

Link: https://lore.kernel.org/r/790922cc3af075795fff9a4b787e6bda19bdb3be.1618417667.git.bblock@linux.ibm.com
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Julian Wiedmann 2021-04-14 19:08:01 +02:00 committed by Martin K. Petersen
parent 8824db894d
commit ab1fa88062
1 changed files with 18 additions and 2 deletions
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20
drivers/s390/scsi/zfcp_aux.c
View File

@ -418,7 +418,7 @@ struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
goto failed;
if (zfcp_diag_sysfs_setup(adapter))
goto failed;
goto err_diag_sysfs;
/* report size limit per scatter-gather segment */
adapter->ccw_device->dev.dma_parms = &adapter->dma_parms;
@ -427,8 +427,24 @@ struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
return adapter;
err_diag_sysfs:
sysfs_remove_group(&ccw_device->dev.kobj, &zfcp_sysfs_adapter_attrs);
failed:
zfcp_adapter_unregister(adapter);
/* TODO: make this more fine-granular */
cancel_delayed_work_sync(&adapter->scan_work);
cancel_work_sync(&adapter->stat_work);
cancel_work_sync(&adapter->ns_up_work);
cancel_work_sync(&adapter->version_change_lost_work);
zfcp_destroy_adapter_work_queue(adapter);
zfcp_fc_wka_ports_force_offline(adapter->gs);
zfcp_scsi_adapter_unregister(adapter);
zfcp_erp_thread_kill(adapter);
zfcp_dbf_adapter_unregister(adapter);
zfcp_qdio_destroy(adapter->qdio);
zfcp_ccw_adapter_put(adapter); /* final put to release */
return ERR_PTR(-ENOMEM);
}