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sata_sis: SCR accessors return -EINVAL when requested SCR isn't available 

sis_scr_cfg_read() can't access SError and was incorrectly returning
-1 instead of -EINVAL.  This went unnoticed because SError used to be
cleared in @postreset() and it didn't care about how scr_read() failed
but commit ac371987 moved SError clearing into sata_link_resume() and
SCR access failure other than -EINVAL is considered an error condition
and exposes the incorrect return value bug as detection failure.  Fix
it.

Also, scsi_scr_cfg_write() was incorrectly returning 0 after it
ignored the request to write to SError.  Make it also return -EINVAL.

This was bisected and reported by Patrick McHardy.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2008-04-24 10:52:44 +09:00 committed by Jeff Garzik
parent 2b4221bb54
commit 8e5443a098
1 changed files with 7 additions and 5 deletions
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12
drivers/ata/sata_sis.c
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@ -142,7 +142,7 @@ static u32 sis_scr_cfg_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
u8 pmr;
if (sc_reg == SCR_ERROR) /* doesn't exist in PCI cfg space */
return 0xffffffff;
return -EINVAL;
pci_read_config_byte(pdev, SIS_PMR, &pmr);
@ -158,14 +158,14 @@ static u32 sis_scr_cfg_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
return 0;
}
static void sis_scr_cfg_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
static int sis_scr_cfg_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
unsigned int cfg_addr = get_scr_cfg_addr(ap, sc_reg);
u8 pmr;
if (sc_reg == SCR_ERROR) /* doesn't exist in PCI cfg space */
return;
return -EINVAL;
pci_read_config_byte(pdev, SIS_PMR, &pmr);
@ -174,6 +174,8 @@ static void sis_scr_cfg_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
if ((pdev->device == 0x0182) || (pdev->device == 0x0183) ||
(pdev->device == 0x1182) || (pmr & SIS_PMR_COMBINED))
pci_write_config_dword(pdev, cfg_addr+0x10, val);
return 0;
}
static int sis_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
@ -211,14 +213,14 @@ static int sis_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
pci_read_config_byte(pdev, SIS_PMR, &pmr);
if (ap->flags & SIS_FLAG_CFGSCR)
sis_scr_cfg_write(ap, sc_reg, val);
return sis_scr_cfg_write(ap, sc_reg, val);
else {
iowrite32(val, ap->ioaddr.scr_addr + (sc_reg * 4));
if ((pdev->device == 0x0182) || (pdev->device == 0x0183) ||
(pdev->device == 0x1182) || (pmr & SIS_PMR_COMBINED))
iowrite32(val, ap->ioaddr.scr_addr + (sc_reg * 4)+0x10);
return 0;
}
return 0;
}
static int sis_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)