linux-kernel - [patch 1/4] Store interrupt value

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Message-Id: <20070705130500.ad5f7739.kristen.c.accardi@intel.com>
Date:	Thu, 5 Jul 2007 13:05:00 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	jeff@...zik.org
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org, James.Bottomley@...eleye.com,
	edwintorok@...il.com, axboe@...nel.dk, linux-scsi@...r.kernel.org,
	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Subject: [patch 1/4] Store interrupt value

Use a stored value for which interrupts to enable.  Changing this allows
us to selectively turn off certain interrupts later and have them 
stay off.

Signed-off-by:  Kristen Carlson Accardi <kristen.c.accardi@...el.com>

Index: 2.6-git/drivers/ata/ahci.c
===================================================================
--- 2.6-git.orig/drivers/ata/ahci.c
+++ 2.6-git/drivers/ata/ahci.c
@@ -211,6 +211,7 @@ struct ahci_port_priv {
 	unsigned int		ncq_saw_d2h:1;
 	unsigned int		ncq_saw_dmas:1;
 	unsigned int		ncq_saw_sdb:1;
+	u32 			intr_mask;	/* interrupts to enable */
 };
 
 static u32 ahci_scr_read (struct ata_port *ap, unsigned int sc_reg);
@@ -1408,6 +1409,7 @@ static void ahci_thaw(struct ata_port *a
 	void __iomem *mmio = ap->host->iomap[AHCI_PCI_BAR];
 	void __iomem *port_mmio = ahci_port_base(ap);
 	u32 tmp;
+	struct ahci_port_priv *pp = ap->private_data;
 
 	/* clear IRQ */
 	tmp = readl(port_mmio + PORT_IRQ_STAT);
@@ -1415,7 +1417,7 @@ static void ahci_thaw(struct ata_port *a
 	writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
 
 	/* turn IRQ back on */
-	writel(DEF_PORT_IRQ, port_mmio + PORT_IRQ_MASK);
+	writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
 }
 
 static void ahci_error_handler(struct ata_port *ap)
@@ -1571,6 +1573,12 @@ static int ahci_port_start(struct ata_po
 	pp->cmd_tbl = mem;
 	pp->cmd_tbl_dma = mem_dma;
 
+	/*
+ 	 * Save off initial list of interrupts to be enabled.
+ 	 * This could be changed later
+ 	 */
+	pp->intr_mask = DEF_PORT_IRQ;
+
 	ap->private_data = pp;
 
 	/* power up port */

-- 
-
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