Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1ccfd63367c1a6aaf8b33943f18856dde85f2f0b
Commit: 1ccfd63367c1a6aaf8b33943f18856dde85f2f0b
Parent: 9713d9e650045f7f2afd81d58a068827be306993
Author: Karsten Keil <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 18 03:04:32 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Oct 18 14:37:17 2007 -0700
i4l: Fix random hard freeze with AVM c4 card
The patch
- Includes the call to capilib_data_b3_req in the spinlock. This routine
in turn calls the offending mq_enqueue routine that triggered the
freeze if not locked. This should also fix other indicators of
incosistent capilib_msgidqueue list, that trigger messages like:
Oct 5 03:05:57 BERL0 kernel: kcapi: msgid 3019 ncci 0x30301 not on queue
that we saw several times a day (usually several in a row).
- Fixes all occurrences of c4_dispatch_tx to be called with active
spinlock, there were some instances where no lock was active. Mostly
these are in very infrequently called routines, so the additional
performance penalty is minimal.
Signed-off-by: Karsten Keil <[EMAIL PROTECTED]>
Signed-off-by: Rainer Brestan <[EMAIL PROTECTED]>
Signed-off-by: Ralf Schlatterbeck <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
drivers/isdn/hardware/avm/c4.c | 14 +++++++++++---
1 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/isdn/hardware/avm/c4.c b/drivers/isdn/hardware/avm/c4.c
index d58f927..8710cf6 100644
--- a/drivers/isdn/hardware/avm/c4.c
+++ b/drivers/isdn/hardware/avm/c4.c
@@ -727,6 +727,7 @@ static void c4_send_init(avmcard *card)
{
struct sk_buff *skb;
void *p;
+ unsigned long flags;
skb = alloc_skb(15, GFP_ATOMIC);
if (!skb) {
@@ -744,12 +745,15 @@ static void c4_send_init(avmcard *card)
skb_put(skb, (u8 *)p - (u8 *)skb->data);
skb_queue_tail(&card->dma->send_queue, skb);
+ spin_lock_irqsave(&card->lock, flags);
c4_dispatch_tx(card);
+ spin_unlock_irqrestore(&card->lock, flags);
}
static int queue_sendconfigword(avmcard *card, u32 val)
{
struct sk_buff *skb;
+ unsigned long flags;
void *p;
skb = alloc_skb(3+4, GFP_ATOMIC);
@@ -766,7 +770,9 @@ static int queue_sendconfigword(avmcard *card, u32 val)
skb_put(skb, (u8 *)p - (u8 *)skb->data);
skb_queue_tail(&card->dma->send_queue, skb);
+ spin_lock_irqsave(&card->lock, flags);
c4_dispatch_tx(card);
+ spin_unlock_irqrestore(&card->lock, flags);
return 0;
}
@@ -986,7 +992,9 @@ static void c4_release_appl(struct capi_ctr *ctrl, u16 appl)
struct sk_buff *skb;
void *p;
+ spin_lock_irqsave(&card->lock, flags);
capilib_release_appl(&cinfo->ncci_head, appl);
+ spin_unlock_irqrestore(&card->lock, flags);
if (ctrl->cnr == card->cardnr) {
skb = alloc_skb(7, GFP_ATOMIC);
@@ -1019,7 +1027,8 @@ static u16 c4_send_message(struct capi_ctr *ctrl, struct
sk_buff *skb)
u16 retval = CAPI_NOERROR;
unsigned long flags;
- if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
+ spin_lock_irqsave(&card->lock, flags);
+ if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
retval = capilib_data_b3_req(&cinfo->ncci_head,
CAPIMSG_APPID(skb->data),
CAPIMSG_NCCI(skb->data),
@@ -1027,10 +1036,9 @@ static u16 c4_send_message(struct capi_ctr *ctrl, struct
sk_buff *skb)
}
if (retval == CAPI_NOERROR) {
skb_queue_tail(&card->dma->send_queue, skb);
- spin_lock_irqsave(&card->lock, flags);
c4_dispatch_tx(card);
- spin_unlock_irqrestore(&card->lock, flags);
}
+ spin_unlock_irqrestore(&card->lock, flags);
return retval;
}
-
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