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Subject[PATCH 24/31] CAPI: Use atomics for capiminor's datahandle and msgid
The capiminor members datahandle and msgid are incremented outside any
lock, so better do this atomically.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
---
drivers/isdn/capi/capi.c | 16 +++++++---------
1 files changed, 7 insertions(+), 9 deletions(-)
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index b8019a1..6ab496c 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -88,10 +88,10 @@ struct capiminor {
unsigned int minor;
struct dentry *capifs_dentry;

- struct capi20_appl *ap;
- u32 ncci;
- u16 datahandle;
- u16 msgid;
+ struct capi20_appl *ap;
+ u32 ncci;
+ atomic_t datahandle;
+ atomic_t msgid;

struct tty_struct *tty;
struct mutex ttylock;
@@ -222,7 +222,6 @@ static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)

mp->ap = ap;
mp->ncci = ncci;
- mp->msgid = 0;
INIT_LIST_HEAD(&mp->ackqueue);
spin_lock_init(&mp->ackqlock);

@@ -396,7 +395,7 @@ gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
capimsg_setu16(s, 2, mp->ap->applid);
capimsg_setu8 (s, 4, CAPI_DATA_B3);
capimsg_setu8 (s, 5, CAPI_RESP);
- capimsg_setu16(s, 6, mp->msgid++);
+ capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
capimsg_setu32(s, 8, mp->ncci);
capimsg_setu16(s, 12, datahandle);
}
@@ -509,7 +508,7 @@ static int handle_minor_send(struct capiminor *mp)
}

while ((skb = skb_dequeue(&mp->outqueue)) != NULL) {
- datahandle = mp->datahandle;
+ datahandle = atomic_inc_return(&mp->datahandle);
len = (u16)skb->len;
skb_push(skb, CAPI_DATA_B3_REQ_LEN);
memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
@@ -517,7 +516,7 @@ static int handle_minor_send(struct capiminor *mp)
capimsg_setu16(skb->data, 2, mp->ap->applid);
capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
capimsg_setu8 (skb->data, 5, CAPI_REQ);
- capimsg_setu16(skb->data, 6, mp->msgid++);
+ capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
capimsg_setu16(skb->data, 16, len); /* Data length */
@@ -531,7 +530,6 @@ static int handle_minor_send(struct capiminor *mp)
}
errcode = capi20_put_message(mp->ap, skb);
if (errcode == CAPI_NOERROR) {
- mp->datahandle++;
count++;
mp->outbytes -= len;
#ifdef _DEBUG_DATAFLOW
--
1.6.0.2


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