joel16/android_kernel_sony_msm8994
1
0
Fork 0
mirror of https://github.com/joel16/android_kernel_sony_msm8994.git synced 2024-11-23 12:10:29 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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>
This commit is contained in:
Maya Erez 2014-11-13 12:55:04 +02:00
parent c3e1cf6f53
commit 1c4c656660
2 changed files with 12 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/scsi/sd.c
View File

@ -2332,6 +2332,7 @@ 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;
@ -2363,7 +2364,10 @@ 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 */

7
include/scsi/scsi_host.h
View File

@ -685,6 +685,13 @@ struct Scsi_Host {
* units along with standard LUs.
*/
unsigned report_wlus: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
*/