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[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>
This commit is contained in:
Al Viro 2006-02-23 02:03:16 +01:00 committed by James Bottomley
parent fc25307d06
commit 6d73c8514d
2 changed files with 17 additions and 2 deletions
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13
drivers/scsi/scsi_lib.c
View File

@ -1892,8 +1892,16 @@ scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
}
if(scsi_status_is_good(result)) {
data->header_length = header_length;
if(use_10_for_ms) {
if (unlikely(buffer[0] == 0x86 && buffer[1] == 0x0b &&
(modepage == 6 || modepage == 8))) {
/* Initio breakage? */
header_length = 0;
data->length = 13;
data->medium_type = 0;
data->device_specific = 0;
data->longlba = 0;
data->block_descriptor_length = 0;
} else if(use_10_for_ms) {
data->length = buffer[0]*256 + buffer[1] + 2;
data->medium_type = buffer[2];
data->device_specific = buffer[3];
@ -1906,6 +1914,7 @@ scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
data->device_specific = buffer[2];
data->block_descriptor_length = buffer[3];
}
data->header_length = header_length;
}
return result;

6
drivers/scsi/sd.c
View File

@ -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;