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    Subject[PATCH] protect 'action' in show_interrupts
    This patch protects a critical section in show_interrupts against 
    removal of 'action' during traversal of the handlers. All the
    architectures in one swoop.

    Index: linux-2.5.64/arch/alpha/kernel/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/alpha/kernel/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/alpha/kernel/irq.c 5 Mar 2003 05:08:08 -0000 1.1.1.1
    +++ linux-2.5.64/arch/alpha/kernel/irq.c 7 Mar 2003 09:11:01 -0000
    @@ -515,6 +515,7 @@
    #endif
    int i;
    struct irqaction * action;
    + unsigned long flags;

    #ifdef CONFIG_SMP
    seq_puts(p, " ");
    @@ -537,16 +538,23 @@
    seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
    #endif
    seq_printf(p, " %14s", irq_desc[i].handler->typename);
    + spin_lock_irqsave(&irq_desc[i].lock, flags);
    + if (!action)
    + goto unlock;
    +
    seq_printf(p, " %c%s",
    - (action->flags & SA_INTERRUPT)?'+':' ',
    - action->name);
    + (action->flags & SA_INTERRUPT)?'+':' ',
    + action->name);

    for (action=action->next; action; action = action->next) {
    seq_printf(p, ", %c%s",
    - (action->flags & SA_INTERRUPT)?'+':' ',
    - action->name);
    + (action->flags & SA_INTERRUPT)?'+':' ',
    + action->name);
    }
    +
    +unlock:
    seq_putc(p, '\n');
    + spin_unlock_irqrestore(&irq_desc[i].lock, flags);
    }
    #if CONFIG_SMP
    seq_puts(p, "IPI: ");
    Index: linux-2.5.64/arch/arm/kernel/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/arm/kernel/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/arm/kernel/irq.c 5 Mar 2003 05:08:11 -0000 1.1.1.1
    +++ linux-2.5.64/arch/arm/kernel/irq.c 7 Mar 2003 08:49:53 -0000
    @@ -165,17 +165,22 @@
    {
    int i;
    struct irqaction * action;
    + unsigned long flags;

    for (i = 0 ; i < NR_IRQS ; i++) {
    action = irq_desc[i].action;
    + spin_lock_irqsave(&irq_desc[i].lock, flags);
    if (!action)
    - continue;
    + goto unlock;
    +
    seq_printf(p, "%3d: %10u ", i, kstat_irqs(i));
    seq_printf(p, " %s", action->name);
    - for (action = action->next; action; action = action->next) {
    + for (action = action->next; action; action = action->next)
    seq_printf(p, ", %s", action->name);
    - }
    +
    seq_putc(p, '\n');
    +unlock:
    + spin_unlock_irqrestore(&irq_desc[i].lock, flags);
    }

    #ifdef CONFIG_ARCH_ACORN
    Index: linux-2.5.64/arch/cris/kernel/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/cris/kernel/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/cris/kernel/irq.c 5 Mar 2003 05:08:09 -0000 1.1.1.1
    +++ linux-2.5.64/arch/cris/kernel/irq.c 7 Mar 2003 09:09:08 -0000
    @@ -228,11 +228,14 @@
    {
    int i;
    struct irqaction * action;
    + unsigned long flags;

    for (i = 0; i < NR_IRQS; i++) {
    action = irq_action[i];
    +
    + local_irq_save(flags);
    if (!action)
    - continue;
    + goto skip;
    seq_printf(p, "%2d: %10u %c %s",
    i, kstat_cpu(0).irqs[i],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    @@ -243,6 +246,8 @@
    action->name);
    }
    seq_putc(p, '\n');
    +skip:
    + local_irq_restore(flags);
    }
    return 0;
    }
    Index: linux-2.5.64/arch/i386/kernel/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/i386/kernel/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/i386/kernel/irq.c 5 Mar 2003 05:08:03 -0000 1.1.1.1
    +++ linux-2.5.64/arch/i386/kernel/irq.c 7 Mar 2003 09:04:43 -0000
    static void register_irq_proc (unsigned int irq);
    @@ -135,6 +135,7 @@
    {
    int i, j;
    struct irqaction * action;
    + unsigned long flags;

    seq_printf(p, " ");
    for (j=0; j<NR_CPUS; j++)
    @@ -156,11 +157,17 @@
    kstat_cpu(j).irqs[i]);
    #endif
    seq_printf(p, " %14s", irq_desc[i].handler->typename);
    + spin_lock_irqsave(&irq_desc[i].lock, flags);
    + if (!action)
    + goto unlock;
    seq_printf(p, " %s", action->name);

    for (action=action->next; action; action = action->next)
    seq_printf(p, ", %s", action->name);
    +
    +unlock:
    seq_putc(p, '\n');
    + spin_unlock_irqrestore(&irq_desc[i].lock, flags);
    }
    seq_printf(p, "NMI: ");
    for (j = 0; j < NR_CPUS; j++)
    Index: linux-2.5.64/arch/ia64/kernel/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/ia64/kernel/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/ia64/kernel/irq.c 5 Mar 2003 05:08:13 -0000 1.1.1.1
    +++ linux-2.5.64/arch/ia64/kernel/irq.c 7 Mar 2003 08:41:09 -0000
    @@ -154,6 +154,7 @@
    int i, j;
    struct irqaction * action;
    irq_desc_t *idesc;
    + unsigned long flags;

    seq_puts(p, " ");
    for (j=0; j<NR_CPUS; j++)
    @@ -175,10 +176,13 @@
    seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
    #endif
    seq_printf(p, " %14s", idesc->handler->typename);
    - seq_printf(p, " %s", action->name);
    -
    - for (action=action->next; action; action = action->next)
    - seq_printf(p, ", %s", action->name);
    + spin_lock_irqsave(&idesc->lock, flags);
    + if (action) {
    + seq_printf(p, " %s", action->name);
    + for (action=action->next; action; action = action->next)
    + seq_printf(p, ", %s", action->name);
    + }
    + spin_unlock_irqrestore(&idesc->lock, flags);
    seq_putc(p, '\n');
    }
    seq_puts(p, "NMI: ");
    Index: linux-2.5.64/arch/mips/baget/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/mips/baget/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/mips/baget/irq.c 5 Mar 2003 05:08:09 -0000 1.1.1.1
    +++ linux-2.5.64/arch/mips/baget/irq.c 7 Mar 2003 09:48:06 -0000
    @@ -146,11 +146,13 @@
    {
    int i;
    struct irqaction * action;
    + unsigned long flags;

    for (i = 0 ; i < BAGET_IRQ_NR ; i++) {
    action = irq_action[i];
    + local_irq_save(flags);
    if (!action)
    - continue;
    + goto skip;
    seq_printf(p, "%2d: %8d %c %s",
    i, kstat_cpu(0).irqs[i],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    @@ -161,6 +163,8 @@
    action->name);
    }
    seq_putc(p, '\n');
    +skip:
    + local_irq_restore(flags);
    }
    return 0;
    }
    Index: linux-2.5.64/arch/mips/dec/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/mips/dec/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/mips/dec/irq.c 5 Mar 2003 05:08:09 -0000 1.1.1.1
    +++ linux-2.5.64/arch/mips/dec/irq.c 7 Mar 2003 09:47:41 -0000
    @@ -97,11 +97,13 @@
    {
    int i;
    struct irqaction *action;
    + unsigned long flags;

    for (i = 0; i < 32; i++) {
    action = irq_action[i];
    + local_irq_save(flags);
    if (!action)
    - continue;
    + goto skip;
    seq_printf(p, "%2d: %8d %c %s",
    i, kstat_cpu(0).irqs[i],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    @@ -112,6 +114,8 @@
    action->name);
    }
    seq_putc(p, '\n');
    +skip:
    + local_irq_restore(flags);
    }
    return 0;
    }
    Index: linux-2.5.64/arch/mips/ite-boards/generic/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/mips/ite-boards/generic/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/mips/ite-boards/generic/irq.c 5 Mar 2003 05:08:09 -0000 1.1.1.1
    +++ linux-2.5.64/arch/mips/ite-boards/generic/irq.c 7 Mar 2003 09:25:42 -0000
    @@ -222,6 +222,7 @@
    {
    int i, j;
    struct irqaction * action;
    + unsigned long flags;

    seq_printf(p, " ");
    for (j=0; j<smp_num_cpus; j++)
    @@ -230,6 +231,7 @@

    for (i = 0 ; i < NR_IRQS ; i++) {
    action = irq_desc[i].action;
    +
    if ( !action || !action->handler )
    continue;
    seq_printf(p, "%3d: ", i);
    @@ -238,11 +240,17 @@
    seq_printf(p, " %s ", irq_desc[i].handler->typename );
    else
    seq_puts(p, " None ");
    +
    + spin_lock_irqsave(&irq_desc[i].lock, flags);
    + if (!action)
    + goto unlock;
    seq_printf(p, " %s",action->name);
    for (action=action->next; action; action = action->next) {
    seq_printf(p, ", %s", action->name);
    }
    +unlock:
    seq_putc(p, '\n');
    + spin_unlock_irqrestore(&irq_desc[i].lock, flags);
    }
    seq_printf(p, "BAD: %10lu\n", spurious_count);
    return 0;
    Index: linux-2.5.64/arch/mips/kernel/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/mips/kernel/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/mips/kernel/irq.c 5 Mar 2003 05:08:09 -0000 1.1.1.1
    +++ linux-2.5.64/arch/mips/kernel/irq.c 7 Mar 2003 09:27:16 -0000
    @@ -73,8 +73,9 @@
    int show_interrupts(struct seq_file *p, void *v)
    {
    struct irqaction * action;
    + unsigned long flags;
    int i;
    -
    +
    seq_puts(p, " ");
    for (i=0; i < 1 /*smp_num_cpus*/; i++)
    seq_printf(p, "CPU%d ", i);
    @@ -82,8 +83,9 @@

    for (i = 0 ; i < NR_IRQS ; i++) {
    action = irq_desc[i].action;
    + spin_lock_irqsave(&irq_desc[i].lock, flags);
    if (!action)
    - continue;
    + goto unlock;
    seq_printf(p, "%3d: ",i);
    seq_printf(p, "%10u ", kstat_irqs(i));
    seq_printf(p, " %14s", irq_desc[i].handler->typename);
    @@ -92,6 +94,8 @@
    for (action=action->next; action; action = action->next)
    seq_printf(p, ", %s", action->name);
    seq_putc(p, '\n');
    +unlock:
    + spin_unlock_irqrestore(&irq_desc[i].lock, flags);
    }
    seq_printf(p, "ERR: %10lu\n", irq_err_count);
    return 0;
    Index: linux-2.5.64/arch/mips/kernel/old-irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/mips/kernel/old-irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 old-irq.c
    --- linux-2.5.64/arch/mips/kernel/old-irq.c 5 Mar 2003 05:08:09 -0000 1.1.1.1
    +++ linux-2.5.64/arch/mips/kernel/old-irq.c 7 Mar 2003 09:45:07 -0000
    @@ -128,11 +128,13 @@
    {
    int i;
    struct irqaction * action;
    + unsigned long flags;

    for (i = 0 ; i < 32 ; i++) {
    action = irq_action[i];
    + local_irq_save(flags);
    if (!action)
    - continue;
    + goto skip;
    seq_printf(p, "%2d: %8d %c %s",
    i, kstat_cpu(0).irqs[i],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    @@ -143,6 +145,8 @@
    action->name);
    }
    seq_putc(p, '\n');
    +skip:
    + local_irq_restore(flags);
    }
    return 0;
    }
    Index: linux-2.5.64/arch/mips/mips-boards/atlas/atlas_int.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/mips/mips-boards/atlas/atlas_int.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 atlas_int.c
    --- linux-2.5.64/arch/mips/mips-boards/atlas/atlas_int.c 5 Mar 2003 05:08:09 -0000 1.1.1.1
    +++ linux-2.5.64/arch/mips/mips-boards/atlas/atlas_int.c 7 Mar 2003 09:30:36 -0000
    @@ -99,11 +99,13 @@
    int i;
    int num = 0;
    struct irqaction *action;
    + unsigned long flags;

    for (i = 0; i < ATLASINT_END; i++, num++) {
    action = irq_desc[i].action;
    + spin_lock_irqsave(&irq_desc[i].lock, flags);
    if (!action)
    - continue;
    + goto unlock;
    seq_printf(p, "%2d: %8d %c %s",
    num, kstat_cpu(0).irqs[num],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    @@ -114,6 +116,8 @@
    action->name);
    }
    seq_printf(p, " [hw0]\n");
    +unlock:
    + spin_unlock_irqrestore(&irq_desc[i].lock, flags);
    }
    return 0;
    }
    Index: linux-2.5.64/arch/mips/philips/nino/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/mips/philips/nino/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/mips/philips/nino/irq.c 5 Mar 2003 05:08:09 -0000 1.1.1.1
    +++ linux-2.5.64/arch/mips/philips/nino/irq.c 7 Mar 2003 09:46:43 -0000
    @@ -119,11 +119,13 @@
    {
    int i;
    struct irqaction *action;
    + unsigned long flags;

    for (i = 0; i < NR_IRQS; i++) {
    action = irq_action[i];
    + local_irq_save(flags);
    if (!action)
    - continue;
    + goto skip;
    seq_printf(p, "%2d: %8d %c %s",
    i, kstat_cpu(0).irqs[i],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    @@ -134,6 +136,8 @@
    action->name);
    }
    seq_putc(p, '\n');
    +skip:
    + local_irq_restore(flags);
    }
    return 0;
    }
    Index: linux-2.5.64/arch/mips64/mips-boards/atlas/atlas_int.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/mips64/mips-boards/atlas/atlas_int.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 atlas_int.c
    --- linux-2.5.64/arch/mips64/mips-boards/atlas/atlas_int.c 5 Mar 2003 05:08:15 -0000 1.1.1.1
    +++ linux-2.5.64/arch/mips64/mips-boards/atlas/atlas_int.c 7 Mar 2003 09:33:55 -0000
    @@ -95,11 +95,13 @@
    int i;
    int num = 0;
    struct irqaction *action;
    + unsigned long flags;

    for (i = 0; i < ATLASINT_END; i++, num++) {
    action = irq_desc[i].action;
    + spin_lock_irqsave(&irq_desc[i].lock, flags);
    if (!action)
    - continue;
    + goto unlock;
    seq_printf(p, "%2d: %8d %c %s",
    num, kstat_cpu(0).irqs[num],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    @@ -110,6 +112,8 @@
    action->name);
    }
    seq_puts(p, " [hw0]\n");
    +unlock:
    + spin_unlock_irqrestore(&irq_desc[i].lock, flags);
    }
    return 0;
    }
    Index: linux-2.5.64/arch/mips64/mips-boards/malta/malta_int.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/mips64/mips-boards/malta/malta_int.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 malta_int.c
    --- linux-2.5.64/arch/mips64/mips-boards/malta/malta_int.c 5 Mar 2003 05:08:15 -0000 1.1.1.1
    +++ linux-2.5.64/arch/mips64/mips-boards/malta/malta_int.c 7 Mar 2003 09:44:50 -0000
    @@ -125,11 +125,13 @@
    int i;
    int num = 0;
    struct irqaction *action;
    + unsigned long flags;

    for (i = 0; i < 8; i++, num++) {
    action = irq_action[i];
    + local_irq_save(flags);
    if (!action)
    - continue;
    + goto skip_1;
    seq_printf(p, "%2d: %8d %c %s",
    num, kstat_cpu(0).irqs[num],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    @@ -140,11 +142,14 @@
    action->name);
    }
    seq_puts(p, " [on-chip]\n");
    +skip_1:
    + local_irq_restore(flags);
    }
    for (i = 0; i < MALTAINT_END; i++, num++) {
    action = hw0_irq_action[i];
    + local_irq_save(flags);
    if (!action)
    - continue;
    + goto skip_2;
    seq_printf(p, "%2d: %8d %c %s",
    num, kstat_cpu(0).irqs[num],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    @@ -155,6 +160,8 @@
    action->name);
    }
    seq_puts(p, " [hw0]\n");
    +skip_2:
    + local_irq_restore(flags);
    }
    return 0;
    }
    Index: linux-2.5.64/arch/mips64/sgi-ip22/ip22-int.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/mips64/sgi-ip22/ip22-int.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 ip22-int.c
    --- linux-2.5.64/arch/mips64/sgi-ip22/ip22-int.c 5 Mar 2003 05:08:15 -0000 1.1.1.1
    +++ linux-2.5.64/arch/mips64/sgi-ip22/ip22-int.c 7 Mar 2003 09:41:57 -0000
    @@ -237,11 +237,13 @@
    int i;
    int num = 0;
    struct irqaction * action;
    + unsigned long flags;

    for (i = 0 ; i < 16 ; i++, num++) {
    action = irq_action[i];
    + local_irq_save(flags);
    if (!action)
    - continue;
    + goto skip_1;
    seq_printf(p, "%2d: %8d %c %s",
    num, kstat_cpu(0).irqs[num],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    @@ -252,11 +254,14 @@
    action->name);
    }
    seq_puts(p, " [on-chip]\n");
    +skip_1:
    + local_irq_restore(flags);
    }
    for (i = 0 ; i < 24 ; i++, num++) {
    action = local_irq_action[i];
    + local_irq_save(flags);
    if (!action)
    - continue;
    + goto skip_2;
    seq_printf(p, "%2d: %8d %c %s",
    num, kstat_cpu(0).irqs[num],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    @@ -267,6 +272,8 @@
    action->name);
    }
    seq_puts(p, " [local]\n");
    +skip_2:
    + local_irq_restore(flags);
    }
    return 0;
    }
    Index: linux-2.5.64/arch/mips64/sgi-ip27/ip27-irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/mips64/sgi-ip27/ip27-irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 ip27-irq.c
    --- linux-2.5.64/arch/mips64/sgi-ip27/ip27-irq.c 5 Mar 2003 05:08:15 -0000 1.1.1.1
    +++ linux-2.5.64/arch/mips64/sgi-ip27/ip27-irq.c 7 Mar 2003 09:43:16 -0000
    @@ -141,11 +141,13 @@
    {
    int i;
    struct irqaction * action;
    + unsigned long flags;

    for (i = 0 ; i < NR_IRQS ; i++) {
    action = irq_action[i];
    + local_irq_save(flags);
    if (!action)
    - continue;
    + goto skip;
    seq_printf(p, "%2d: %8d %c %s", i, kstat_cpu(0).irqs[i],
    (action->flags & SA_INTERRUPT) ? '+' : ' ',
    action->name);
    @@ -156,6 +158,8 @@
    action->name);
    }
    seq_putc(p, '\n');
    +skip:
    + local_irq_restore(flags);
    }
    return 0;
    }
    Index: linux-2.5.64/arch/ppc/kernel/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/ppc/kernel/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/ppc/kernel/irq.c 5 Mar 2003 05:08:03 -0000 1.1.1.1
    +++ linux-2.5.64/arch/ppc/kernel/irq.c 7 Mar 2003 08:43:48 -0000
    @@ -346,6 +346,7 @@
    {
    int i, j;
    struct irqaction * action;
    + unsigned long flags;

    seq_puts(p, " ");
    for (j=0; j<NR_CPUS; j++)
    @@ -371,9 +372,13 @@
    else
    seq_puts(p, " None ");
    seq_printf(p, "%s", (irq_desc[i].status & IRQ_LEVEL) ? "Level " : "Edge ");
    - seq_printf(p, " %s", action->name);
    - for (action = action->next; action; action = action->next)
    - seq_printf(p, ", %s", action->name);
    + spin_lock_irqsave(&irq_desc[i].lock, flags);
    + if (action) {
    + seq_printf(p, " %s", action->name);
    + for (action = action->next; action; action = action->next)
    + seq_printf(p, ", %s", action->name);
    + }
    + spin_unlock_irqrestore(&irq_desc[i].lock, flags);
    seq_putc(p, '\n');
    }
    #ifdef CONFIG_TAU_INT
    Index: linux-2.5.64/arch/ppc64/kernel/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/ppc64/kernel/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/ppc64/kernel/irq.c 5 Mar 2003 05:08:10 -0000 1.1.1.1
    +++ linux-2.5.64/arch/ppc64/kernel/irq.c 7 Mar 2003 08:45:10 -0000
    @@ -341,6 +341,7 @@
    {
    int i, j;
    struct irqaction * action;
    + unsigned long flags;

    seq_printf(p, " ");
    for (j=0; j<NR_CPUS; j++) {
    @@ -367,9 +368,13 @@
    else
    seq_printf(p, " None ");
    seq_printf(p, "%s", (irq_desc[i].status & IRQ_LEVEL) ? "Level " : "Edge ");
    - seq_printf(p, " %s",action->name);
    - for (action=action->next; action; action = action->next)
    - seq_printf(p, ", %s", action->name);
    + spin_lock_irqsave(&irq_desc[i].lock, flags);
    + if (action) {
    + seq_printf(p, " %s",action->name);
    + for (action=action->next; action; action = action->next)
    + seq_printf(p, ", %s", action->name);
    + }
    + spin_unlock_irqrestore(&irq_desc[i].lock, flags);
    seq_putc(p, '\n');
    }
    seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
    Index: linux-2.5.64/arch/sh/kernel/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/sh/kernel/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/sh/kernel/irq.c 5 Mar 2003 05:08:16 -0000 1.1.1.1
    +++ linux-2.5.64/arch/sh/kernel/irq.c 7 Mar 2003 09:06:38 -0000
    @@ -90,6 +90,7 @@
    {
    int i, j;
    struct irqaction * action;
    + unsigned long flags;

    seq_puts(p, " ");
    for (j=0; j<smp_num_cpus; j++)
    @@ -98,8 +99,9 @@

    for (i = 0 ; i < ACTUAL_NR_IRQS ; i++) {
    action = irq_desc[i].action;
    - if (!action)
    - continue;
    + spin_lock_irqsave(&irq_desc[i].lock, flags);
    + if (!action)
    + goto unlock;
    seq_printf(p, "%3d: ",i);
    seq_printf(p, "%10u ", kstat_irqs(i));
    seq_printf(p, " %14s", irq_desc[i].handler->typename);
    @@ -108,6 +110,8 @@
    for (action=action->next; action; action = action->next)
    seq_printf(p, ", %s", action->name);
    seq_putc(p, '\n');
    +unlock:
    + spin_unlock_irqrestore(&irq_desc[i].lock, flags);
    }
    return 0;
    }
    Index: linux-2.5.64/arch/v850/kernel/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/v850/kernel/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/v850/kernel/irq.c 5 Mar 2003 05:08:16 -0000 1.1.1.1
    +++ linux-2.5.64/arch/v850/kernel/irq.c 7 Mar 2003 09:05:29 -0000
    @@ -78,6 +78,7 @@
    {
    int i;
    struct irqaction * action;
    + unsigned long flags;

    seq_puts(p, " ");
    for (i=0; i < 1 /*smp_num_cpus*/; i++)
    @@ -108,11 +109,16 @@
    seq_printf(p, " %*s%d", 14 - prec, type_name, num);
    } else
    seq_printf(p, " %14s", type_name);
    + spin_lock_irqsave(&irq_desc[j].lock, flags);
    + if (!action)
    + goto unlock;
    seq_printf(p, " %s", action->name);

    for (action=action->next; action; action = action->next)
    seq_printf(p, ", %s", action->name);
    +unlock:
    seq_putc(p, '\n');
    + spin_unlock_irqrestore(&irq_desc[j].lock, flags);
    }
    seq_printf(p, "ERR: %10lu\n", irq_err_count);
    return 0;
    Index: linux-2.5.64/arch/x86_64/kernel/irq.c
    ===================================================================
    RCS file: /build/cvsroot/linux-2.5.64/arch/x86_64/kernel/irq.c,v
    retrieving revision 1.1.1.1
    diff -u -r1.1.1.1 irq.c
    --- linux-2.5.64/arch/x86_64/kernel/irq.c 5 Mar 2003 05:08:16 -0000 1.1.1.1
    +++ linux-2.5.64/arch/x86_64/kernel/irq.c 7 Mar 2003 09:05:00 -0000
    @@ -135,6 +135,7 @@
    {
    int i, j;
    struct irqaction * action;
    + unsigned long flags;

    seq_printf(p, " ");
    for (j=0; j<NR_CPUS; j++)
    @@ -156,11 +157,17 @@
    kstat_cpu(j).irqs[i]);
    #endif
    seq_printf(p, " %14s", irq_desc[i].handler->typename);
    +
    + spin_lock_irqsave(&irq_desc[i].lock, flags);
    + if (!action)
    + goto unlock;
    seq_printf(p, " %s", action->name);

    for (action=action->next; action; action = action->next)
    seq_printf(p, ", %s", action->name);
    +unlock:
    seq_putc(p, '\n');
    + spin_unlock_irqrestore(&irq_desc[i].lock, flags);
    }
    seq_printf(p, "NMI: ");
    for (j = 0; j < NR_CPUS; j++)
    --
    function.linuxpower.ca
    -
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