diff options
| author | Martin K. Petersen <martin.petersen@oracle.com> | 2013-10-23 06:25:40 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-11 22:36:28 -0800 |
| commit | 8562d028775e7c88fc7fa8c5deaa791392892778 (patch) | |
| tree | 8b40e1f29bf66978ef17364bc583f74d3a5fc614 /drivers/ata | |
| parent | 5e43e33a63d72c6bd30f9fa14a9e82ffb58be422 (diff) | |
SCSI: Disable WRITE SAME for RAID and virtual host adapter drivers
commit 54b2b50c20a61b51199bedb6e5d2f8ec2568fb43 upstream.
Some host adapters do not pass commands through to the target disk
directly. Instead they provide an emulated target which may or may not
accurately report its capabilities. In some cases the physical device
characteristics are reported even when the host adapter is processing
commands on the device's behalf. This can lead to adapter firmware hangs
or excessive I/O errors.
This patch disables WRITE SAME for devices connected to host adapters
that provide an emulated target. Driver writers can disable WRITE SAME
by setting the no_write_same flag in the host adapter template.
[jejb: fix up rejections due to eh_deadline patch]
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libata-scsi.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 0101af541436..4abdbdff6943 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -3614,6 +3614,7 @@ int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) shost->max_lun = 1; shost->max_channel = 1; shost->max_cmd_len = 16; + shost->no_write_same = 1; /* Schedule policy is determined by ->qc_defer() * callback and it needs to see every deferred qc. |