Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

caif: Bugfix - use standard Linux lists

Browse source 
Discovered bug when running high number of parallel connect requests.
Replace buggy home brewed list with linux/list.h.

Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sjur Braendeland 2010-05-21 02:16:08 +00:00 committed by David S. Miller
parent 9e4b816bc3
commit 7aecf4944f
2 changed files with 30 additions and 70 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
include/net/caif/cfctrl.h
View file

@ -94,8 +94,8 @@ struct cfctrl_request_info {
enum cfctrl_cmd cmd;
u8 channel_id;
struct cfctrl_link_param param;
struct cfctrl_request_info *next;
struct cflayer *client_layer;
struct list_head list;
};
struct cfctrl {
@ -103,7 +103,7 @@ struct cfctrl {
struct cfctrl_rsp res;
atomic_t req_seq_no;
atomic_t rsp_seq_no;
struct cfctrl_request_info *first_req;
struct list_head list;
/* Protects from simultaneous access to first_req list */
spinlock_t info_list_lock;
#ifndef CAIF_NO_LOOP

96
net/caif/cfctrl.c
View file

@ -44,13 +44,14 @@ struct cflayer *cfctrl_create(void)
dev_info.id = 0xff;
memset(this, 0, sizeof(*this));
cfsrvl_init(&this->serv, 0, &dev_info);
spin_lock_init(&this->info_list_lock);
atomic_set(&this->req_seq_no, 1);
atomic_set(&this->rsp_seq_no, 1);
this->serv.layer.receive = cfctrl_recv;
sprintf(this->serv.layer.name, "ctrl");
this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
spin_lock_init(&this->loop_linkid_lock);
spin_lock_init(&this->info_list_lock);
INIT_LIST_HEAD(&this->list);
this->loop_linkid = 1;
return &this->serv.layer;
}
@ -112,20 +113,10 @@ bool cfctrl_req_eq(struct cfctrl_request_info *r1,
void cfctrl_insert_req(struct cfctrl *ctrl,
struct cfctrl_request_info *req)
{
struct cfctrl_request_info *p;
spin_lock(&ctrl->info_list_lock);
req->next = NULL;
atomic_inc(&ctrl->req_seq_no);
req->sequence_no = atomic_read(&ctrl->req_seq_no);
if (ctrl->first_req == NULL) {
ctrl->first_req = req;
spin_unlock(&ctrl->info_list_lock);
return;
}
p = ctrl->first_req;
while (p->next != NULL)
p = p->next;
p->next = req;
list_add_tail(&req->list, &ctrl->list);
spin_unlock(&ctrl->info_list_lock);
}
@ -133,46 +124,28 @@ void cfctrl_insert_req(struct cfctrl *ctrl,
struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
struct cfctrl_request_info *req)
{
struct cfctrl_request_info *p;
struct cfctrl_request_info *ret;
struct cfctrl_request_info *p, *tmp, *first;
spin_lock(&ctrl->info_list_lock);
if (ctrl->first_req == NULL) {
spin_unlock(&ctrl->info_list_lock);
return NULL;
}
first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
if (cfctrl_req_eq(req, ctrl->first_req)) {
ret = ctrl->first_req;
caif_assert(ctrl->first_req);
atomic_set(&ctrl->rsp_seq_no,
ctrl->first_req->sequence_no);
ctrl->first_req = ctrl->first_req->next;
spin_unlock(&ctrl->info_list_lock);
return ret;
}
p = ctrl->first_req;
while (p->next != NULL) {
if (cfctrl_req_eq(req, p->next)) {
pr_warning("CAIF: %s(): Requests are not "
list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
if (cfctrl_req_eq(req, p)) {
if (p != first)
pr_warning("CAIF: %s(): Requests are not "
"received in order\n",
__func__);
ret = p->next;
atomic_set(&ctrl->rsp_seq_no,
p->next->sequence_no);
p->next = p->next->next;
spin_unlock(&ctrl->info_list_lock);
return ret;
}
p = p->next;
}
spin_unlock(&ctrl->info_list_lock);
pr_warning("CAIF: %s(): Request does not match\n",
__func__);
return NULL;
atomic_set(&ctrl->rsp_seq_no,
p->sequence_no);
list_del(&p->list);
goto out;
}
}
p = NULL;
out:
spin_unlock(&ctrl->info_list_lock);
return p;
}
struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
@ -388,31 +361,18 @@ void cfctrl_getstartreason_req(struct cflayer *layer)
void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
{
struct cfctrl_request_info *p, *req;
struct cfctrl_request_info *p, *tmp;
struct cfctrl *ctrl = container_obj(layr);
spin_lock(&ctrl->info_list_lock);
pr_warning("CAIF: %s(): enter\n", __func__);
if (ctrl->first_req == NULL) {
spin_unlock(&ctrl->info_list_lock);
return;
}
if (ctrl->first_req->client_layer == adap_layer) {
req = ctrl->first_req;
ctrl->first_req = ctrl->first_req->next;
kfree(req);
}
p = ctrl->first_req;
while (p != NULL && p->next != NULL) {
if (p->next->client_layer == adap_layer) {
req = p->next;
p->next = p->next->next;
kfree(p->next);
list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
if (p->client_layer == adap_layer) {
pr_warning("CAIF: %s(): cancel req :%d\n", __func__,
p->sequence_no);
list_del(&p->list);
kfree(p);
}
p = p->next;
}
spin_unlock(&ctrl->info_list_lock);
@ -634,7 +594,7 @@ static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
case CAIF_CTRLCMD_FLOW_OFF_IND:
spin_lock(&this->info_list_lock);
if (this->first_req != NULL) {
if (!list_empty(&this->list)) {
pr_debug("CAIF: %s(): Received flow off in "
"control layer", __func__);
}