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scsi: Adjust DBD setting in mode sense for caching mode page per LLD

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Host sends MODE_SENSE_10 with caching mode page, to check if the device
supports the cache feature.
Some LLD standards requires DBD field to be set to 1.

This patch allows LLD to define the setting of DBD if required.

Change-Id: I7f6c0ff6613516c3ef49aacc0679b96b8bd9ccc8
Signed-off-by: Maya Erez <merez@codeaurora.org>
[mattw@codeaurora.org: resolved a trivial context conflict in
Scsi_Host struct definition]
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
[subhashj@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
This commit is contained in:
Maya Erez 2014-11-13 12:55:04 +02:00 • committed by David Keitel
parent 3abbdb57e3
commit 36c183b743
2 changed files with 11 additions and 1 deletions
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6
drivers/scsi/sd.c
View file

@ -2456,6 +2456,7 @@ sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
{
int len = 0, res;
struct scsi_device *sdp = sdkp->device;
struct Scsi_Host *host = sdp->host;
int dbd;
int modepage;
@ -2487,7 +2488,10 @@ sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
dbd = 8;
} else {
modepage = 8;
dbd = 0;
if (host->set_dbd_for_caching)
dbd = 8;
else
dbd = 0;
}
/* cautiously ask */

6
include/scsi/scsi_host.h
View file

@ -671,6 +671,12 @@ struct Scsi_Host {
/* Host responded with short (<36 bytes) INQUIRY result */
unsigned short_inquiry:1;
/*
* Set "DBD" field in mode_sense caching mode page in case it is
* mandatory by LLD standard.
*/
unsigned set_dbd_for_caching:1;
/*
* Optional work queue to be utilized by the transport
*/