The patch titled
i4l: Fix random hard freeze with AVM c4 card
has been removed from the -mm tree. Its filename was
fix-random-hard-freeze-with-avm-c4-card.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: i4l: Fix random hard freeze with AVM c4 card
From: Karsten Keil <kkeil@xxxxxxx>
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 <kkeil@xxxxxxx>
Signed-off-by: Rainer Brestan <rainer.brestan@xxxxxxxxxxxxxx>
Signed-off-by: Ralf Schlatterbeck <rsc@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/isdn/hardware/avm/c4.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff -puN drivers/isdn/hardware/avm/c4.c~fix-random-hard-freeze-with-avm-c4-card drivers/isdn/hardware/avm/c4.c
--- a/drivers/isdn/hardware/avm/c4.c~fix-random-hard-freeze-with-avm-c4-card
+++ a/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
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_
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_c
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_c
}
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;
}
_
Patches currently in -mm which might be from kkeil@xxxxxxx are
origin.patch
fix-random-hard-freeze-with-avm-c4-card-part-2.patch
fix-random-hard-freeze-with-avm-cards-using-b1dma.patch
fix-random-hard-freeze-with-avm-cards-using-b1dma-checkpatch-fixes.patch
fix-random-hard-freeze-with-avm-t1-cards.patch
isdn-sc-remove-unused-request_irq-and-unnecessary-header-file.patch
-
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