From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtps.tip.net.au (chilli.pcug.org.au [203.10.76.44]) by ozlabs.org (Postfix) with ESMTP id 0DE8567D3F for ; Mon, 13 Nov 2006 14:43:23 +1100 (EST) Date: Mon, 13 Nov 2006 14:43:17 +1100 From: Stephen Rothwell To: paulus@samba.org Subject: [POWERPC] iSeries: improve viodasd initialisation Message-Id: <20061113144317.7418633b.sfr@canb.auug.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Cc: ppc-dev List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On error, make sure that we undo all necessary operations. This also gets rid of a must_check warning. Signed-off-by: Stephen Rothwell --- drivers/block/viodasd.c | 49 ++++++++++++++++++++++++++++++++++------------ 1 files changed, 36 insertions(+), 13 deletions(-) -- Cheers, Stephen Rothwell sfr@canb.auug.org.au diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c index ec5a1b9..e19ba4e 100644 --- a/drivers/block/viodasd.c +++ b/drivers/block/viodasd.c @@ -759,6 +759,8 @@ static struct vio_driver viodasd_driver } }; +static int need_delete_probe; + /* * Initialize the whole device driver. Handle module and non-module * versions @@ -773,46 +775,67 @@ static int __init viodasd_init(void) if (viopath_hostLp == HvLpIndexInvalid) { printk(VIOD_KERN_WARNING "invalid hosting partition\n"); - return -EIO; + rc = -EIO; + goto early_fail; } printk(VIOD_KERN_INFO "vers " VIOD_VERS ", hosting partition %d\n", viopath_hostLp); /* register the block device */ - if (register_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME)) { + rc = register_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); + if (rc) { printk(VIOD_KERN_WARNING "Unable to get major number %d for %s\n", VIODASD_MAJOR, VIOD_GENHD_NAME); - return -EIO; + goto early_fail; } /* Actually open the path to the hosting partition */ - if (viopath_open(viopath_hostLp, viomajorsubtype_blockio, - VIOMAXREQ + 2)) { + rc = viopath_open(viopath_hostLp, viomajorsubtype_blockio, + VIOMAXREQ + 2); + if (rc) { printk(VIOD_KERN_WARNING "error opening path to host partition %d\n", viopath_hostLp); - unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); - return -EIO; + goto unregister_blk; } /* Initialize our request handler */ vio_setHandler(viomajorsubtype_blockio, handle_block_event); rc = vio_register_driver(&viodasd_driver); - if (rc == 0) - driver_create_file(&viodasd_driver.driver, &driver_attr_probe); + if (rc) { + printk(VIOD_KERN_WARNING "vio_register_driver failed\n"); + goto unset_handler; + } + + /* + * If this call fails, it just means that we cannot dynamically + * add virtual disks, but the driver will still work fine for + * all existing disk, so ignore the failure. + */ + if (!driver_create_file(&viodasd_driver.driver, &driver_attr_probe)) + need_delete_probe = 1; + + return 0; + +unset_handler: + vio_clearHandler(viomajorsubtype_blockio); + viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2); +unregister_blk: + unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); +early_fail: return rc; } module_init(viodasd_init); -void viodasd_exit(void) +void __exit viodasd_exit(void) { - driver_remove_file(&viodasd_driver.driver, &driver_attr_probe); + if (need_delete_probe) + driver_remove_file(&viodasd_driver.driver, &driver_attr_probe); vio_unregister_driver(&viodasd_driver); vio_clearHandler(viomajorsubtype_blockio); - unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2); + unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); } - module_exit(viodasd_exit); -- 1.4.3.3