[PATCH libata-dev#upstream-fixes] libata: ignore CFA signature while sanity-checking an ATAPI device

[Tejun Heo <htejun@gmail.com>]

0x848a in ID word 0 indicates CFA device iff the ID data is obtained
from IDENTIFY DEVICE.  For ATAPI devices, 0x848a in ID work 0
indicates valid ATAPI device.  Fix sanity check in ata_dev_read_id()
such that ATAPI devices reporting 0x848a in ID word 0 is not handled
as error.

The problem is identified by J.A. Magallon with HL-DT-ST DVDRAM
GSA-4120B.

Signed-off-by: Tejun Helo <htejun@gmail.com>
Cc: J.A. Magallon <jamagallon@ono.com>
---
Jeff, this is a regression and thus should go into .19.

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 73dd6c8..427b73a 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1256,10 +1256,15 @@ int ata_dev_read_id(struct ata_device *d
 	swap_buf_le16(id, ATA_ID_WORDS);
 
 	/* sanity check */
-	if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
-		rc = -EINVAL;
-		reason = "device reports illegal type";
-		goto err_out;
+	rc = -EINVAL;
+	reason = "device reports illegal type";
+
+	if (class == ATA_DEV_ATA) {
+		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
+			goto err_out;
+	} else {
+		if (ata_id_is_ata(id))
+			goto err_out;
 	}
 
 	if (post_reset && class == ATA_DEV_ATA) {
-
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