Hello.
On 18-04-2011 22:45, James Bottomley wrote:
On non-x86 systems, probing a port which is listed as disabled can
cause an immediate crash. Fix the driver not to do this by porting
the enablebits check from the IDE driver and setting the
ATA_HOST_SFF_SINGLE_PORT flag if only the primary is enabled.
Signed-off-by: James Bottomley<James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/ata/pata_cmd64x.c | 22 +++++++++++++++++++---
1 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/drivers/ata/pata_cmd64x.c b/drivers/ata/pata_cmd64x.c
index 905ff76..aa71a13 100644
--- a/drivers/ata/pata_cmd64x.c
+++ b/drivers/ata/pata_cmd64x.c
@@ -41,6 +41,9 @@
enum {
CFR = 0x50,
CFR_INTR_CH0 = 0x04,
+ ENPORT = 0x51,
The register is actually called CNTRL.
BTW, the PCI-649 specification is available at:
http://gkernel.sourceforge.net/specs/sii/SiI649-DS-0066.pdf.bz2
+ ENPORT_PRIMARY = 0x04,
+ ENPORT_SECONDARY = 0x08,
CMDTIM = 0x52,
ARTTIM0 = 0x53,
DRWTIM0 = 0x54,
@@ -329,8 +332,8 @@ static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
}
};
const struct ata_port_info *ppi[] = {&cmd_info[id->driver_data], NULL };
- u8 mrdmode;
- int rc;
+ u8 mrdmode, reg;
+ int rc, hflags = 0;
rc = pcim_enable_device(pdev);
if (rc)
@@ -354,6 +357,19 @@ static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
mrdmode |= 0x02; /* Memory read line enable */
pci_write_config_byte(pdev, MRDMODE, mrdmode);
+ /* check for enabled ports */
+ pci_read_config_byte(pdev, ENPORT, ®);
+ /* the cm643 primary port is always enabled */
+ if (id->driver_data != 0&& !(reg& ENPORT_PRIMARY)) {
That's not quite correct. The original PCI0646 didn't have the primary
channel enable bit as well as PCI0643; only PCI0646U+ had the bit in question.
+ dev_printk(KERN_ERR, &pdev->dev, "Primary port is disabled; detaching\n");
+ return -ENODEV;
Why? It's perfectly valid to have only secondary port enabled.
WBR, Sergei
--
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
