From: tglx@linutronix.de (Thomas Gleixner)
To: linux-arm-kernel@lists.infradead.org
Subject: [patch 01/23] arm: Ns9xxx: Remove private irq flow handler
Date: Fri, 25 Mar 2011 13:21:50 -0000 [thread overview]
Message-ID: <20110325132047.456346554@linutronix.de> (raw)
In-Reply-To: 20110325131617.258789658@linutronix.de
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Name: arm-ns9xxx-remove-private-irq-flow-handler.patch
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20110325/fc1be487/attachment.ksh>
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: LAK <linux-arm-kernel@lists.infradead.org>,
Russell King <linux@arm.linux.org.uk>,
Lennert Buytenhek <buytenh@wantstofly.org>,
Peter Zijlstra <peterz@infradead.org>,
Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
Subject: [patch 01/23] arm: Ns9xxx: Remove private irq flow handler
Date: Fri, 25 Mar 2011 13:21:50 -0000 [thread overview]
Message-ID: <20110325132047.456346554@linutronix.de> (raw)
In-Reply-To: 20110325131617.258789658@linutronix.de
[-- Attachment #1: arm-ns9xxx-remove-private-irq-flow-handler.patch --]
[-- Type: text/plain, Size: 4141 bytes --]
handle_prio_irq is almost identical with handle_fasteoi_irq. The
subtle differences are
1) The handler checks for IRQ_DISABLED after the device handler has
been called. In case it's set it masks the interrupt.
2) When the handler sees IRQ_DISABLED on entry it masks the interupt
in the same way as handle_fastoei_irq, but does not set the
IRQ_PENDING flag.
3) Instead of gracefully handling a recursive interrupt it crashes the
kernel.
#1 is just relevant when a device handler calls disable_irq_nosync()
and it does not matter whether we mask the interrupt right away or
not. We handle lazy masking for disable_irq anyway, so there is no
real reason to have this extra mask in place.
#2 will prevent the resend of a pending interrupt, which can result in
lost interrupts for edge type interrupts. For level type interrupts
the resend is a noop in the generic code. According to the
datasheet all interrupts are level type, so marking them as such
will result in the exact same behaviour as the private
handle_prio_irq implementation.
#3 is just stupid. Crashing the kernel instead of handling a problem
gracefully is just wrong. With the current semantics- all handlers
run with interrupts disabled - this is even more wrong.
Rename ack to eoi, remove the unused mask_ack, switch to
handle_fasteoi_irq and remove the private function.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Acked-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
LKML-Reference: <20110202212552.299898447@linutronix.de>
---
arch/arm/mach-ns9xxx/irq.c | 58 +++------------------------------------------
1 file changed, 4 insertions(+), 54 deletions(-)
Index: linux-2.6-tip/arch/arm/mach-ns9xxx/irq.c
===================================================================
--- linux-2.6-tip.orig/arch/arm/mach-ns9xxx/irq.c
+++ linux-2.6-tip/arch/arm/mach-ns9xxx/irq.c
@@ -31,17 +31,11 @@ static void ns9xxx_mask_irq(struct irq_d
__raw_writel(ic, SYS_IC(prio / 4));
}
-static void ns9xxx_ack_irq(struct irq_data *d)
+static void ns9xxx_eoi_irq(struct irq_data *d)
{
__raw_writel(0, SYS_ISRADDR);
}
-static void ns9xxx_maskack_irq(struct irq_data *d)
-{
- ns9xxx_mask_irq(d);
- ns9xxx_ack_irq(d);
-}
-
static void ns9xxx_unmask_irq(struct irq_data *d)
{
/* XXX: better use cpp symbols */
@@ -52,56 +46,11 @@ static void ns9xxx_unmask_irq(struct irq
}
static struct irq_chip ns9xxx_chip = {
- .irq_ack = ns9xxx_ack_irq,
+ .irq_eoi = ns9xxx_eoi_irq,
.irq_mask = ns9xxx_mask_irq,
- .irq_mask_ack = ns9xxx_maskack_irq,
.irq_unmask = ns9xxx_unmask_irq,
};
-#if 0
-#define handle_irq handle_level_irq
-#else
-static void handle_prio_irq(unsigned int irq, struct irq_desc *desc)
-{
- struct irqaction *action;
- irqreturn_t action_ret;
-
- raw_spin_lock(&desc->lock);
-
- BUG_ON(desc->status & IRQ_INPROGRESS);
-
- desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
- kstat_incr_irqs_this_cpu(irq, desc);
-
- action = desc->action;
- if (unlikely(!action || (desc->status & IRQ_DISABLED)))
- goto out_mask;
-
- desc->status |= IRQ_INPROGRESS;
- raw_spin_unlock(&desc->lock);
-
- action_ret = handle_IRQ_event(irq, action);
-
- /* XXX: There is no direct way to access noirqdebug, so check
- * unconditionally for spurious irqs...
- * Maybe this function should go to kernel/irq/chip.c? */
- note_interrupt(irq, desc, action_ret);
-
- raw_spin_lock(&desc->lock);
- desc->status &= ~IRQ_INPROGRESS;
-
- if (desc->status & IRQ_DISABLED)
-out_mask:
- desc->irq_data.chip->irq_mask(&desc->irq_data);
-
- /* ack unconditionally to unmask lower prio irqs */
- desc->irq_data.chip->irq_ack(&desc->irq_data);
-
- raw_spin_unlock(&desc->lock);
-}
-#define handle_irq handle_prio_irq
-#endif
-
void __init ns9xxx_init_irq(void)
{
int i;
@@ -119,7 +68,8 @@ void __init ns9xxx_init_irq(void)
for (i = 0; i <= 31; ++i) {
set_irq_chip(i, &ns9xxx_chip);
- set_irq_handler(i, handle_irq);
+ set_irq_handler(i, handle_fasteoi_irq);
set_irq_flags(i, IRQF_VALID);
+ irq_set_status_flags(i, IRQ_LEVEL);
}
}
next prev parent reply other threads:[~2011-03-25 13:21 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-25 13:21 [patch 00/23] ARM: Final genirq cleanup Thomas Gleixner
2011-03-25 13:21 ` Thomas Gleixner
2011-03-25 13:21 ` Thomas Gleixner [this message]
2011-03-25 13:21 ` [patch 01/23] arm: Ns9xxx: Remove private irq flow handler Thomas Gleixner
2011-03-25 13:21 ` [patch 02/23] arm: tegra: Remove unused function which fiddles with irq_desc Thomas Gleixner
2011-03-25 13:21 ` Thomas Gleixner
2011-03-25 13:21 ` Thomas Gleixner
[not found] ` <20110325132047.552074703-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
2011-03-26 20:12 ` Varun Wadekar
2011-03-26 20:12 ` Varun Wadekar
2011-03-26 20:12 ` Varun Wadekar
[not found] ` <4D8E4897.5030705-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2011-03-26 20:24 ` Thomas Gleixner
2011-03-26 20:24 ` Thomas Gleixner
2011-03-26 20:24 ` Thomas Gleixner
[not found] ` <alpine.LFD.2.00.1103262118010.31464-bi+AKbBUZKagILUCTcTcHdKyNwTtLsGr@public.gmane.org>
2011-03-26 22:37 ` Colin Cross
2011-03-26 22:37 ` Colin Cross
2011-03-26 22:37 ` Colin Cross
[not found] ` <AANLkTi=y9JkpJVCq5G151G9k3d0rAcSH13gi6uGB_gDX-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-03-27 8:07 ` Thomas Gleixner
2011-03-27 8:07 ` Thomas Gleixner
2011-03-27 8:07 ` Thomas Gleixner
2011-03-25 13:21 ` [patch 03/23] arm: Use genirq lockdep helper to set lock class Thomas Gleixner
2011-03-25 13:21 ` Thomas Gleixner
2011-03-25 13:21 ` [patch 04/23] arm: Use irq flag setter function Thomas Gleixner
2011-03-25 13:21 ` Thomas Gleixner
2011-03-25 13:21 ` [patch 05/23] arm: msm: Convert to new irq chip functions Thomas Gleixner
2011-03-25 13:21 ` Thomas Gleixner
2011-03-25 13:21 ` [patch 06/23] arm: Cleanup irq_desc access Thomas Gleixner
2011-03-25 13:21 ` Thomas Gleixner
2011-03-25 13:21 ` [patch 07/23] arm: plat-samsung: Use proper irq accessor functions Thomas Gleixner
2011-03-25 13:21 ` Thomas Gleixner
2011-03-25 13:21 ` [patch 08/23] arm: stmp3xxx: Use generic_handle_irq() Thomas Gleixner
2011-03-25 13:21 ` Thomas Gleixner
2011-03-25 13:21 ` [patch 09/23] arm: nomadik: Use local irq state Thomas Gleixner
2011-03-25 13:21 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 10/23] arm: plat-omap: Cleanup irq_desc access Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 11/23] arm: msm: Use proper irq accessor functions Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 12/23] arm: vt8500: Use proper irq accessors Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 13/23] arm: mxc: Use generic_handle_irq() Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 14/23] arm: gemini: Use proper irq accessor functions Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 15/23] arm: ep93xx: " Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 16/23] arm: davinci: Cleanup irq chip code Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 17/23] arm: at91: Cleanup irq chip Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 21:03 ` Thomas Gleixner
2011-03-25 21:03 ` Thomas Gleixner
2011-03-27 15:02 ` Sergei Shtylyov
2011-03-27 15:02 ` Sergei Shtylyov
2011-03-27 15:47 ` Thomas Gleixner
2011-03-27 15:47 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 18/23] arm: gic: Use proper accessor functions Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 19/23] arm: dove: Use proper irq " Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 20/23] arm: Use generic show_interrupts() Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 21/23] arm: Cleanup the irq namespace Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-04-18 17:43 ` H Hartley Sweeten
2011-04-18 17:43 ` H Hartley Sweeten
2011-03-25 13:22 ` [patch 22/23] arm: Reorder irq_set_ function calls Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
2011-03-25 13:22 ` [patch 23/23] arm: Fold irq_set_chip/irq_set_handler Thomas Gleixner
2011-03-25 13:22 ` Thomas Gleixner
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