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IB/iser: Fix list iteration bug 

The iteration through the list of "iser_device"s during device
lookup/creation is broken -- it might result in an infinite loop if
more than one HCA is used with iSER.  Fix this by using
list_for_each_entry() instead of the open-coded flawed list iteration
code.

Signed-off-by: Arne Redlich <arne.redlich@xiranet.com>
Signed-off-by: Erez Zilber <erezz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Arne Redlich 2008-03-04 14:07:22 +02:00 committed by Roland Dreier
parent 4fa45725df
commit 9a378270c0
1 changed files with 16 additions and 20 deletions
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36
drivers/infiniband/ulp/iser/iser_verbs.c
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@ -237,33 +237,29 @@ static int iser_free_ib_conn_res(struct iser_conn *ib_conn)
static
struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
{
struct list_head *p_list;
struct iser_device *device = NULL;
struct iser_device *device;
mutex_lock(&ig.device_list_mutex);
p_list = ig.device_list.next;
while (p_list != &ig.device_list) {
device = list_entry(p_list, struct iser_device, ig_list);
list_for_each_entry(device, &ig.device_list, ig_list)
/* find if there's a match using the node GUID */
if (device->ib_device->node_guid == cma_id->device->node_guid)
break;
}
goto out;
if (device == NULL) {
device = kzalloc(sizeof *device, GFP_KERNEL);
if (device == NULL)
goto out;
/* assign this device to the device */
device->ib_device = cma_id->device;
/* init the device and link it into ig device list */
if (iser_create_device_ib_res(device)) {
kfree(device);
device = NULL;
goto out;
}
list_add(&device->ig_list, &ig.device_list);
device = kzalloc(sizeof *device, GFP_KERNEL);
if (device == NULL)
goto out;
/* assign this device to the device */
device->ib_device = cma_id->device;
/* init the device and link it into ig device list */
if (iser_create_device_ib_res(device)) {
kfree(device);
device = NULL;
goto out;
}
list_add(&device->ig_list, &ig.device_list);
out:
BUG_ON(device == NULL);
device->refcount++;