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author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-03-12 16:27:53 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-03-12 16:27:53 (GMT) |
commit | f1c7404e37a8970bd58cc10a6d96534d42b9aac6 (patch) | |
tree | c7d067f08f7ceca58f29526cb498c92e654ee400 /arch | |
parent | 8c57a8fa4e9226a44c4e98327852936df3b6791b (diff) | |
parent | 0796e75503adc6b0a119493ce2e599fb5fd8f96e (diff) | |
download | linux-f1c7404e37a8970bd58cc10a6d96534d42b9aac6.tar.xz |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
sunhme: Fix qfe parent detection.
sparc64: Fix lost interrupts on sun4u.
sparc64: wait_event_interruptible_timeout may return -ERESTARTSYS
jsflash: stop defining MAJOR_NR
Diffstat (limited to 'arch')
-rw-r--r-- | arch/sparc/kernel/irq_64.c | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c index e289376..1c378d8 100644 --- a/arch/sparc/kernel/irq_64.c +++ b/arch/sparc/kernel/irq_64.c @@ -323,17 +323,25 @@ static void sun4u_set_affinity(unsigned int virt_irq, sun4u_irq_enable(virt_irq); } +/* Don't do anything. The desc->status check for IRQ_DISABLED in + * handler_irq() will skip the handler call and that will leave the + * interrupt in the sent state. The next ->enable() call will hit the + * ICLR register to reset the state machine. + * + * This scheme is necessary, instead of clearing the Valid bit in the + * IMAP register, to handle the case of IMAP registers being shared by + * multiple INOs (and thus ICLR registers). Since we use a different + * virtual IRQ for each shared IMAP instance, the generic code thinks + * there is only one user so it prematurely calls ->disable() on + * free_irq(). + * + * We have to provide an explicit ->disable() method instead of using + * NULL to get the default. The reason is that if the generic code + * sees that, it also hooks up a default ->shutdown method which + * invokes ->mask() which we do not want. See irq_chip_set_defaults(). + */ static void sun4u_irq_disable(unsigned int virt_irq) { - struct irq_handler_data *data = get_irq_chip_data(virt_irq); - - if (likely(data)) { - unsigned long imap = data->imap; - unsigned long tmp = upa_readq(imap); - - tmp &= ~IMAP_VALID; - upa_writeq(tmp, imap); - } } static void sun4u_irq_eoi(unsigned int virt_irq) @@ -746,7 +754,8 @@ void handler_irq(int irq, struct pt_regs *regs) desc = irq_desc + virt_irq; - desc->handle_irq(virt_irq, desc); + if (!(desc->status & IRQ_DISABLED)) + desc->handle_irq(virt_irq, desc); bucket_pa = next_pa; } |