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Subject[PATCH v2 13/41] CAPI: Convert capidev_list_lock into a mutex
Date
No need for anything "harder" here (specifically no need for
irqsave...). Also, make the list removal the first operation of
capidev_free to avoid dumping half-released devices via /proc.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
---
drivers/isdn/capi/capi.c | 24 ++++++++++++------------
1 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 7d2ca6b..623412e 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -146,7 +146,7 @@ struct capidev {

/* -------- global variables ---------------------------------------- */

-static DEFINE_RWLOCK(capidev_list_lock);
+static DEFINE_MUTEX(capidev_list_lock);
static LIST_HEAD(capidev_list);

#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
@@ -406,7 +406,6 @@ static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
static struct capidev *capidev_alloc(void)
{
struct capidev *cdev;
- unsigned long flags;

cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
if (!cdev)
@@ -415,15 +414,19 @@ static struct capidev *capidev_alloc(void)
mutex_init(&cdev->ncci_list_mtx);
skb_queue_head_init(&cdev->recvqueue);
init_waitqueue_head(&cdev->recvwait);
- write_lock_irqsave(&capidev_list_lock, flags);
+
+ mutex_lock(&capidev_list_lock);
list_add_tail(&cdev->list, &capidev_list);
- write_unlock_irqrestore(&capidev_list_lock, flags);
+ mutex_unlock(&capidev_list_lock);
+
return cdev;
}

static void capidev_free(struct capidev *cdev)
{
- unsigned long flags;
+ mutex_lock(&capidev_list_lock);
+ list_del(&cdev->list);
+ mutex_unlock(&capidev_list_lock);

if (cdev->ap.applid) {
capi20_release(&cdev->ap);
@@ -435,9 +438,6 @@ static void capidev_free(struct capidev *cdev)
capincci_free(cdev, 0xffffffff);
mutex_unlock(&cdev->ncci_list_mtx);

- write_lock_irqsave(&capidev_list_lock, flags);
- list_del(&cdev->list);
- write_unlock_irqrestore(&capidev_list_lock, flags);
kfree(cdev);
}

@@ -1431,7 +1431,7 @@ static int capi20_proc_show(struct seq_file *m, void *v)
struct capidev *cdev;
struct list_head *l;

- read_lock(&capidev_list_lock);
+ mutex_lock(&capidev_list_lock);
list_for_each(l, &capidev_list) {
cdev = list_entry(l, struct capidev, list);
seq_printf(m, "0 %d %lu %lu %lu %lu\n",
@@ -1441,7 +1441,7 @@ static int capi20_proc_show(struct seq_file *m, void *v)
cdev->ap.nsentctlpkt,
cdev->ap.nsentdatapkt);
}
- read_unlock(&capidev_list_lock);
+ mutex_unlock(&capidev_list_lock);
return 0;
}

@@ -1468,7 +1468,7 @@ static int capi20ncci_proc_show(struct seq_file *m, void *v)
struct capincci *np;
struct list_head *l;

- read_lock(&capidev_list_lock);
+ mutex_lock(&capidev_list_lock);
list_for_each(l, &capidev_list) {
cdev = list_entry(l, struct capidev, list);
for (np=cdev->nccis; np; np = np->next) {
@@ -1477,7 +1477,7 @@ static int capi20ncci_proc_show(struct seq_file *m, void *v)
np->ncci);
}
}
- read_unlock(&capidev_list_lock);
+ mutex_unlock(&capidev_list_lock);
return 0;
}

--
1.6.0.2


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