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libata: make ->scr_read/write callbacks return error code

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Convert ->scr_read/write callbacks to return error code to better
indicate failure.  This will help handling of SCR_NOTIFICATION.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo
2007-07-16 14:29:40 +09:00
committed by Jeff Garzik
parent 5335b72906
commit da3dbb17a0
15 changed files with 191 additions and 136 deletions
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drivers/ata/sata_vsc.c
+7 -6
View File
@@ -98,20 +98,21 @@ enum {
VSC_SATA_INT_PHY_CHANGE),
};
static u32 vsc_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
static int vsc_sata_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
{
if (sc_reg > SCR_CONTROL)
return 0xffffffffU;
return readl(ap->ioaddr.scr_addr + (sc_reg * 4));
return -EINVAL;
*val = readl(ap->ioaddr.scr_addr + (sc_reg * 4));
return 0;
}
static void vsc_sata_scr_write (struct ata_port *ap, unsigned int sc_reg,
u32 val)
static int vsc_sata_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
{
if (sc_reg > SCR_CONTROL)
return;
return -EINVAL;
writel(val, ap->ioaddr.scr_addr + (sc_reg * 4));
return 0;
}