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authorMike Christie <michaelc@cs.wisc.edu>2008-06-11 19:21:00 -0500
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-06-15 11:09:43 -0500
commit3ed7897242b7efe977f3a8d06d4e5a4ebe28b10e (patch)
tree68bd33deefa188f9e13693d0f8396ca58239f124
parentd1daeabf0da5bfa1943272ce508e2ba785730bf0 (diff)
[SCSI] scsi_host regression: fix scsi host leak
commit 9c7701088a61cc0cf8a6e1c68d1e74e3cc2ee0b7 Author: Dave Young <hidave.darkstar@gmail.com> Date: Tue Jan 22 14:01:34 2008 +0800 scsi: use class iteration api Isn't a correct replacement for the original hand rolled host lookup. The problem is that class_find_child would get a reference to the host's class device which is never released. Since the host class device holds a reference to the host gendev, the host can never be freed. In 2.6.26 we started using class_find_device, and this function also gets a reference to the device, so we end up with an extra ref and the host will not get released. This patch adds a put_device to balance the class_find_device() get. I kept the scsi_host_get in scsi_host_lookup, because the target layer is using scsi_host_lookup and it looks like it needs the SHOST_DEL check. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
-rw-r--r--drivers/scsi/hosts.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 3690360d7a7..c6457bfc8a4 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -456,6 +456,10 @@ static int __scsi_host_match(struct device *dev, void *data)
*
* Return value:
* A pointer to located Scsi_Host or NULL.
+ *
+ * The caller must do a scsi_host_put() to drop the reference
+ * that scsi_host_get() took. The put_device() below dropped
+ * the reference from class_find_device().
**/
struct Scsi_Host *scsi_host_lookup(unsigned short hostnum)
{
@@ -463,9 +467,10 @@ struct Scsi_Host *scsi_host_lookup(unsigned short hostnum)
struct Scsi_Host *shost = ERR_PTR(-ENXIO);
cdev = class_find_device(&shost_class, &hostnum, __scsi_host_match);
- if (cdev)
+ if (cdev) {
shost = scsi_host_get(class_to_shost(cdev));
-
+ put_device(cdev);
+ }
return shost;
}
EXPORT_SYMBOL(scsi_host_lookup);