diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2010-09-29 22:16:36 +0200 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2011-04-30 16:53:04 +0200 |
| commit | a6a215cbde7988ca1a03a90376557244e1e5f39a (patch) | |
| tree | 6fe8914812d80892886c2071898f378b61f351b4 | |
| parent | fb35bcad2fe725cace7d25e03952ecd1a46da557 (diff) | |
isdn: hisax: Replace the bogus access to irq stats
commit 40f08a724fcc21285cf3a75aec957aef908605c6 upstream.
Abusing irq stats in a driver for counting interrupts is a horrible
idea and not safe with shared interrupts. Replace it by a local
interrupt counter.
Noticed by the attempt to remove the irq stats export.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Cc: maximilian attems <max@stro.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/isdn/hisax/config.c | 18 | ||||
| -rw-r--r-- | drivers/isdn/hisax/hisax.h | 1 |
2 files changed, 15 insertions, 4 deletions
diff --git a/drivers/isdn/hisax/config.c b/drivers/isdn/hisax/config.c index 84d75a3f5d17..4b9f6b0bdb3e 100644 --- a/drivers/isdn/hisax/config.c +++ b/drivers/isdn/hisax/config.c @@ -806,6 +806,16 @@ static void closecard(int cardnr) ll_unload(csta); } +static irqreturn_t card_irq(int intno, void *dev_id) +{ + struct IsdnCardState *cs = dev_id; + irqreturn_t ret = cs->irq_func(intno, cs); + + if (ret == IRQ_HANDLED) + cs->irq_cnt++; + return ret; +} + static int init_card(struct IsdnCardState *cs) { int irq_cnt, cnt = 3, ret; @@ -814,10 +824,10 @@ static int init_card(struct IsdnCardState *cs) ret = cs->cardmsg(cs, CARD_INIT, NULL); return(ret); } - irq_cnt = kstat_irqs(cs->irq); + irq_cnt = cs->irq_cnt = 0; printk(KERN_INFO "%s: IRQ %d count %d\n", CardType[cs->typ], cs->irq, irq_cnt); - if (request_irq(cs->irq, cs->irq_func, cs->irq_flags, "HiSax", cs)) { + if (request_irq(cs->irq, card_irq, cs->irq_flags, "HiSax", cs)) { printk(KERN_WARNING "HiSax: couldn't get interrupt %d\n", cs->irq); return 1; @@ -827,8 +837,8 @@ static int init_card(struct IsdnCardState *cs) /* Timeout 10ms */ msleep(10); printk(KERN_INFO "%s: IRQ %d count %d\n", - CardType[cs->typ], cs->irq, kstat_irqs(cs->irq)); - if (kstat_irqs(cs->irq) == irq_cnt) { + CardType[cs->typ], cs->irq, cs->irq_cnt); + if (cs->irq_cnt == irq_cnt) { printk(KERN_WARNING "%s: IRQ(%d) getting no interrupts during init %d\n", CardType[cs->typ], cs->irq, 4 - cnt); diff --git a/drivers/isdn/hisax/hisax.h b/drivers/isdn/hisax/hisax.h index f1a828bf1da6..bbcee6daf5ac 100644 --- a/drivers/isdn/hisax/hisax.h +++ b/drivers/isdn/hisax/hisax.h @@ -950,6 +950,7 @@ struct IsdnCardState { u_long event; struct work_struct tqueue; struct timer_list dbusytimer; + unsigned int irq_cnt; #ifdef ERROR_STATISTIC int err_crc; int err_tx; |