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authorStephen Rothwell <sfr@canb.auug.org.au>2006-11-13 14:43:17 +1100
committerPaul Mackerras <paulus@samba.org>2006-12-04 20:39:10 +1100
commitf9df68ec7bf49e37b46aa0a5d9e7938c060dba52 (patch)
treed3a8918428d17e9a650459a19d3df882b0bc035d /drivers/block/viodasd.c
parent6ad4e70cafc43155d3a7e6e796e8b6b6967fc9e2 (diff)
[POWERPC] iSeries: improve viodasd initialisation
On error, make sure that we undo all necessary operations. This also gets rid of a must_check warning. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'drivers/block/viodasd.c')
-rw-r--r--drivers/block/viodasd.c49
1 files changed, 36 insertions, 13 deletions
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index ec5a1b90a0a..e19ba4ebcd4 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);