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Date: Thu, 10 Jul 2008 13:05:02 +0100
From: David Howells <dhowells@...hat.com>
To: alan@...hat.com, Markus.Lidel@...dowconnect.com, vvs@...ru,
akpm@...ux-foundation.org
Cc: dhowells@...hat.com, linux-kernel@...r.kernel.org,
linux-scsi@...r.kernel.org
Subject: [PATCH] Fix error handling in i2o_device_add()
Fix error handling in i2o_device_add() - sysfs_create_link() can return an
error.
Signed-off-by: David Howells <dhowells@...hat.com>
---
drivers/message/i2o/device.c | 90 +++++++++++++++++++++++++++++++++---------
1 files changed, 71 insertions(+), 19 deletions(-)
diff --git a/drivers/message/i2o/device.c b/drivers/message/i2o/device.c
index 489d7c5..c8b37e9 100644
--- a/drivers/message/i2o/device.c
+++ b/drivers/message/i2o/device.c
@@ -218,7 +218,8 @@ static struct i2o_device *i2o_device_alloc(void)
*/
static int i2o_device_add(struct i2o_controller *c, i2o_lct_entry *entry)
{
- struct i2o_device *i2o_dev, *tmp;
+ struct list_head *_usrdev, *_pardev;
+ struct i2o_device *i2o_dev, *usr, *usrdev, *par, *pardev;
int rc;
i2o_dev = i2o_device_alloc();
@@ -242,30 +243,52 @@ static int i2o_device_add(struct i2o_controller *c, i2o_lct_entry *entry)
list_add_tail(&i2o_dev->list, &c->devices);
/* create user entries for this device */
- tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.user_tid);
- if (tmp && (tmp != i2o_dev))
- sysfs_create_link(&i2o_dev->device.kobj, &tmp->device.kobj,
- "user");
+ usr = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.user_tid);
+ if (usr && usr != i2o_dev) {
+ rc = sysfs_create_link(&i2o_dev->device.kobj, &usr->device.kobj,
+ "user");
+ if (rc != 0)
+ goto err_unregister;
+ } else {
+ usr = NULL;
+ }
/* create user entries refering to this device */
- list_for_each_entry(tmp, &c->devices, list)
- if ((tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
- && (tmp != i2o_dev))
- sysfs_create_link(&tmp->device.kobj,
- &i2o_dev->device.kobj, "user");
+ list_for_each(_usrdev, &c->devices) {
+ usrdev = list_entry(_usrdev, struct i2o_device, list);
+ if (usrdev->lct_data.user_tid == i2o_dev->lct_data.tid &&
+ usrdev != i2o_dev) {
+ rc = sysfs_create_link(&usrdev->device.kobj,
+ &i2o_dev->device.kobj,
+ "user");
+ if (rc != 0)
+ goto err_discard_user_links;
+ }
+ }
/* create parent entries for this device */
- tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.parent_tid);
- if (tmp && (tmp != i2o_dev))
- sysfs_create_link(&i2o_dev->device.kobj, &tmp->device.kobj,
- "parent");
+ par = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.parent_tid);
+ if (par && par != i2o_dev) {
+ rc = sysfs_create_link(&i2o_dev->device.kobj, &par->device.kobj,
+ "parent");
+ if (rc != 0)
+ goto err_discard_user_links;
+ } else {
+ par = NULL;
+ }
/* create parent entries refering to this device */
- list_for_each_entry(tmp, &c->devices, list)
- if ((tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
- && (tmp != i2o_dev))
- sysfs_create_link(&tmp->device.kobj,
- &i2o_dev->device.kobj, "parent");
+ list_for_each(_pardev, &c->devices) {
+ pardev = list_entry(_pardev, struct i2o_device, list);
+ if (pardev->lct_data.parent_tid == i2o_dev->lct_data.tid &&
+ pardev != i2o_dev) {
+ rc = sysfs_create_link(&pardev->device.kobj,
+ &i2o_dev->device.kobj,
+ "parent");
+ if (rc != 0)
+ goto err_discard_parent_links;
+ }
+ }
i2o_driver_notify_device_add_all(i2o_dev);
@@ -273,6 +296,35 @@ static int i2o_device_add(struct i2o_controller *c, i2o_lct_entry *entry)
return 0;
+err_discard_parent_links:
+ while (_pardev = _pardev->prev,
+ prefetch(_pardev->prev),
+ _pardev != &c->devices
+ ) {
+ pardev = list_entry(_pardev, struct i2o_device, list);
+ if (pardev->lct_data.parent_tid == i2o_dev->lct_data.tid &&
+ pardev != i2o_dev)
+ sysfs_remove_link(&pardev->device.kobj, "parent");
+ }
+ if (par)
+ sysfs_remove_link(&i2o_dev->device.kobj, "parent");
+
+err_discard_user_links:
+ while (_usrdev = _usrdev->prev,
+ prefetch(_usrdev->prev),
+ _usrdev != &c->devices
+ ) {
+ usrdev = list_entry(_usrdev, struct i2o_device, list);
+ if (usrdev->lct_data.user_tid == i2o_dev->lct_data.tid &&
+ usrdev != i2o_dev)
+ sysfs_remove_link(&usrdev->device.kobj, "user");
+ }
+ if (usr)
+ sysfs_remove_link(&i2o_dev->device.kobj, "user");
+
+err_unregister:
+ list_del_init(&i2o_dev->list);
+ device_unregister(&i2o_dev->device);
err:
kfree(i2o_dev);
return rc;
--
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