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[PATCH] libata: ignore CFA signature while sanity-checking an ATAPI device 

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>
Acked-by: Jeff Garzik <jeff@garzik.org>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Tejun Heo 2006-09-12 20:35:49 -07:00 committed by Linus Torvalds
parent 95064a75eb
commit a4f5749ba6
1 changed files with 9 additions and 4 deletions
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13
drivers/scsi/libata-core.c
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@ -1256,10 +1256,15 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
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) {