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Commit f9df68ec authored by Stephen Rothwell's avatar Stephen Rothwell Committed by Paul Mackerras
Browse files

[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: default avatarStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 6ad4e70c

drivers/block/viodasd.c

+36 −13
Original line number Diff line number Diff line
@@ -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)

{

	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);