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authorJan Kiszka <jan.kiszka@web.de>2010-02-08 13:12:38 +0300
committerDavid S. Miller <davem@davemloft.net>2010-02-17 03:01:33 +0300
commit42792713f7f2664cf07501e1244d6da33a73ffc1 (patch)
tree6e1ee9e4e4592fff6734039a77e1ef611a91cba3 /drivers/isdn
parent42651b5c1aabf5eb60fbe98375ba127f4f6eb943 (diff)
downloadlinux-42792713f7f2664cf07501e1244d6da33a73ffc1.tar.xz
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> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn')
-rw-r--r--drivers/isdn/capi/capi.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 9d4750a0aece..08d5a8aa2fec 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -87,10 +87,10 @@ 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_port port;
int ttyinstop;
@@ -227,7 +227,6 @@ 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);
@@ -427,7 +426,7 @@ 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);
}
@@ -554,7 +553,7 @@ 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);
@@ -562,7 +561,7 @@ 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 */
@@ -577,7 +576,6 @@ 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