From 9a378270c085080b2f38dee6308de4d8413b5141 Mon Sep 17 00:00:00 2001 From: Arne Redlich Date: Tue, 4 Mar 2008 14:07:22 +0200 Subject: [PATCH] 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 Signed-off-by: Erez Zilber Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/iser/iser_verbs.c | 36 ++++++++++++++------------------ 1 file changed, 16 insertions(+), 20 deletions(-) diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c index 714b8db..768ba69 100644 --- a/drivers/infiniband/ulp/iser/iser_verbs.c +++ b/drivers/infiniband/ulp/iser/iser_verbs.c @@ -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; - } - - 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++; -- 2.7.4