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authorIngo Molnar <mingo@elte.hu>2006-09-19 11:14:34 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-19 16:57:20 +0200
commit86998aa6534e839ec003ed2ef7067d6fe8696ccc (patch)
treeca2e8fff9371ef26f339f2893c6c1d50c5f4e2fe /kernel/irq/chip.c
parentx86: save/restore eflags in context switch (diff)
downloadlinux-86998aa6534e839ec003ed2ef7067d6fe8696ccc.tar.xz
linux-86998aa6534e839ec003ed2ef7067d6fe8696ccc.zip
[PATCH] genirq core: fix handle_level_irq()
while porting the -rt tree to 2.6.18-rc7 i noticed the following screaming-IRQ scenario on an SMP system: 2274 0Dn.:1 0.001ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.010ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.020ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.029ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.039ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.048ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.058ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.068ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.077ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.087ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.097ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) as it turns out, the bug is caused by handle_level_irq(), which if it races with another CPU already handling this IRQ, it _unmasks_ the IRQ line on the way out. This is not how 2.6.17 works, and we introduced this bug in one of the early genirq cleanups right before it went into -mm. (the bug was not in the genirq patchset for a long time, and we didnt notice the bug due to the lack of -rt rebase to the new genirq code. -rt, and hardirq-preemption in particular opens up such races much wider than anything else.) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to '')
-rw-r--r--kernel/irq/chip.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 9336f2e89e40..ac1f850d4937 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -252,7 +252,7 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs)
mask_ack_irq(desc, irq);
if (unlikely(desc->status & IRQ_INPROGRESS))
- goto out;
+ goto out_unlock;
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
kstat_cpu(cpu).irqs[irq]++;
@@ -263,7 +263,7 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs)
action = desc->action;
if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
desc->status |= IRQ_PENDING;
- goto out;
+ goto out_unlock;
}
desc->status |= IRQ_INPROGRESS;
@@ -276,9 +276,9 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs)
spin_lock(&desc->lock);
desc->status &= ~IRQ_INPROGRESS;
-out:
if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask)
desc->chip->unmask(irq);
+out_unlock:
spin_unlock(&desc->lock);
}