linux-kernel - [PATCH] libata: refuse to register IRQless ports

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Date:	Tue, 26 Sep 2006 17:35:32 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	jgarzik@...ox.com, linux-kernel@...r.kernel.org
Subject: [PATCH] libata: refuse to register IRQless ports

We don't currently support pure polled operation so when we meet a BIOS
which forgot to assign an IRQ to a PCI device it all goes a little pear
shaped. Trap this case properly.

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

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.18-mm1/drivers/ata/libata-core.c linux-2.6.18-mm1/drivers/ata/libata-core.c
--- linux.vanilla-2.6.18-mm1/drivers/ata/libata-core.c	2006-09-25 12:10:08.000000000 +0100
+++ linux-2.6.18-mm1/drivers/ata/libata-core.c	2006-09-26 11:47:57.041010560 +0100
@@ -5460,6 +5460,11 @@
 	int rc;
 
 	DPRINTK("ENTER\n");
+	
+	if (ent->irq == 0) {
+		dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
+		return 0;
+	}
 	/* alloc a container for our list of ATA ports (buses) */
 	host = kzalloc(sizeof(struct ata_host) +
 		       (ent->n_ports * sizeof(void *)), GFP_KERNEL);

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