From 635416ef393e8cec5a89fc6c1de710ee9596a51e Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Mon, 16 Jun 2008 14:35:15 +0200 Subject: [PATCH] pcmcia: irq probe can be done without risking an IRQ storm Nowdays you can ask for an IRQ to be allocated but not enabled, when PCMCIA was written this was not true and this feature is thus not used [linux@dominikbrodowski.net: add comment and ifdef to avoid compilation breakage at least on alpha] Signed-off-by: Alan Cox Signed-off-by: Andrew Morton Signed-off-by: Dominik Brodowski --- drivers/pcmcia/pcmcia_resource.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c index c8f77b889d42..78af59415930 100644 --- a/drivers/pcmcia/pcmcia_resource.c +++ b/drivers/pcmcia/pcmcia_resource.c @@ -812,6 +812,15 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req) type = IRQF_SHARED; #ifdef CONFIG_PCMCIA_PROBE + +#ifdef IRQ_NOAUTOEN + /* if the underlying IRQ infrastructure allows for it, only allocate + * the IRQ, but do not enable it + */ + if (!(req->Attributes & IRQ_HANDLE_PRESENT)) + type |= IRQ_NOAUTOEN; +#endif /* IRQ_NOAUTOEN */ + if (s->irq.AssignedIRQ != 0) { /* If the interrupt is already assigned, it must be the same */ irq = s->irq.AssignedIRQ; -- 2.20.1