linux-kernel - [PATCH] pcmcia: irq probe can be done without risking an IRQ storm

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Message-ID: <20070405140936.46fb6ba4@the-village.bc.nu>
Date:	Thu, 5 Apr 2007 14:09:36 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	akpm@...l.org, linux-kernel@...r.kernel.org
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

Signed-off-by: Alan Cox <alan@...hat.com>

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.21-rc5-mm4/drivers/pcmcia/pcmcia_resource.c linux-2.6.21-rc5-mm4/drivers/pcmcia/pcmcia_resource.c
--- linux.vanilla-2.6.21-rc5-mm4/drivers/pcmcia/pcmcia_resource.c	2007-04-03 16:52:14.000000000 +0100
+++ linux-2.6.21-rc5-mm4/drivers/pcmcia/pcmcia_resource.c	2007-04-03 17:10:42.000000000 +0100
@@ -810,8 +810,11 @@
 		type = IRQF_SHARED;
 	if (req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)
 		type = IRQF_SHARED;	
 #ifdef CONFIG_PCMCIA_PROBE
+	if (!(req->Attributes & IRQ_HANDLE_PRESENT))
+		type |= IRQ_NOAUTOEN;
+
 	if (s->irq.AssignedIRQ != 0) {
 		/* If the interrupt is already assigned, it must be the same */
 		irq = s->irq.AssignedIRQ;
-
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