SCSI: fix race in device_create
There is a race from when a device is created with device_create() and
then the drvdata is set with a call to dev_set_drvdata() in which a
sysfs file could be open, yet the drvdata will be NULL, causing all
sorts of bad things to happen.
This patch fixes the problem by using the new function,
device_create_drvdata(). It fixes the problem in all of the scsi
drivers that need it.
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Doug Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index 75c84d7..c4b938b 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -910,9 +910,9 @@
ch->minor = minor;
sprintf(ch->name,"ch%d",ch->minor);
- class_dev = device_create(ch_sysfs_class, dev,
- MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
- "s%s", ch->name);
+ class_dev = device_create_drvdata(ch_sysfs_class, dev,
+ MKDEV(SCSI_CHANGER_MAJOR, ch->minor),
+ ch, "s%s", ch->name);
if (IS_ERR(class_dev)) {
printk(KERN_WARNING "ch%d: device_create failed\n",
ch->minor);
@@ -926,7 +926,6 @@
if (init)
ch_init_elem(ch);
- dev_set_drvdata(dev, ch);
sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
return 0;