[ 31/46] SCSI: sd: Reshuffle init_sd to avoid crash

Greg Kroah-Hartman
2013-01-24T21:30:26Z

From: "Joel D. Diaz" <joeldiaz@us.ibm.com>

commit afd5e34b2bb34881d3a789e62486814a49b47faa upstream.

scsi_register_driver will register a prep_fn() function, which
in turn migh need to use the sd_cdp_pool for DIF.
Which hasn't been initialised at this point, leading to
a crash. So reshuffle the init_sd() and exit_sd() paths
to have the driver registered last.

Signed-off-by: Joel D. Diaz <joeldiaz@us.ibm.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Cc: CAI Qian <caiqian@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/scsi/sd.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3116,10 +3116,6 @@ static int __init init_sd(void)
if (err)
goto err_out;

- err = scsi_register_driver(&sd_template.gendrv);
- if (err)
- goto err_out_class;
-
sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
0, 0, NULL);
if (!sd_cdb_cache) {
@@ -3133,8 +3129,15 @@ static int __init init_sd(void)
goto err_out_cache;
}

+ err = scsi_register_driver(&sd_template.gendrv);
+ if (err)
+ goto err_out_driver;
+
return 0;

+err_out_driver:
+ mempool_destroy(sd_cdb_pool);
+
err_out_cache:
kmem_cache_destroy(sd_cdb_cache);

@@ -3157,10 +3160,10 @@ static void __exit exit_sd(void)

SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));

+ scsi_unregister_driver(&sd_template.gendrv);
mempool_destroy(sd_cdb_pool);
kmem_cache_destroy(sd_cdb_cache);

- scsi_unregister_driver(&sd_template.gendrv);
class_unregister(&sd_disk_class);

for (i = 0; i < SD_MAJORS; i++)