[SCSI] scsi_lib: fix recognition of cache type of Initio SBP-2 bridges

Regardless what mode page was asked for, Initio INIC-14x0 and
INIC-2430 always return page 6 without mode page headers.  Try to
recognise this as a special case in scsi_mode_sense and setting the
mode sense headers accordingly.

Signed-off-by: Al Viro <viro@ftp.linux.org.uk>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 76b4d14c0b3f..31c9685ebc5a 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1333,6 +1333,12 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
         if (!scsi_status_is_good(res))
                 goto bad_sense;
 
+        if (!data.header_length) {
+                modepage = 6;
+                printk(KERN_ERR "%s: missing header in MODE_SENSE response\n",
+                       diskname);
+        }
+
         /* that went OK, now ask for the proper length */
         len = data.length;