Re: SATA DOM is not identified by ata_piix module

[Tejun Heo]

Mao Rui wrote:
> I tried to nail down when the problem was introduced. I compiled some
> official kernel release. Here is the result.
> 2.6.17.14   IDE -- Failed   SATA -- passed
> 2.6.18   IDE -- Failed   SATA -- failed
> 2.6.18.8   IDE -- Failed   SATA -- failed
> 2.6.24-rc7-git6  IDE -- passed   SATA DOM -- failed
> linux-2.6.24-rc8-git1   IDE -- passed    SATA -- failed
> All IDE failed reason is xfermode error, and all SATA failure is IDENTIFY
> error.
> 
> As you can find out, the failure of SATA DOM was introduced from kernel
> 2.6.18.
> 
> I'm not good at low level driver programming, so I cannot find out the root
> cause by myself. But if Alan or someone else needs more info or wants to
> test the patch, I'm glad to do it in my platform.

Does the attached patch make any difference?

-- 
tejun
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index ce803d1..76d779a 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1975,17 +1975,21 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
 		 */
 		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
 			err_mask = ata_dev_init_params(dev, id[3], id[6]);
-			if (err_mask) {
+			if (err_mask == 0) {
+				/* current CHS translation info (id[53-58])
+				 * might be changed. reread the identify
+				 * device info.
+				 */
+				flags &= ~ATA_READID_POSTRESET;
+				goto retry;
+			} else if (err_mask == AC_ERR_DEV) {
+				ata_dev_printk(dev, KERN_INFO,
+					"INIT_DEV_PARAMS rejected by device\n");
+			} else {
 				rc = -EIO;
 				reason = "INIT_DEV_PARAMS failed";
 				goto err_out;
 			}
-
-			/* current CHS translation info (id[53-58]) might be
-			 * changed. reread the identify device info.
-			 */
-			flags &= ~ATA_READID_POSTRESET;
-			goto retry;
 		}
 	}