diff options
| author | Andy Grover <agrover@redhat.com> | 2014-05-14 15:48:06 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-06-07 10:28:24 -0700 |
| commit | e1ff900f3b048d488c81c21b18ae9da022a293a8 (patch) | |
| tree | fcc60ded122debaab94af89a2dd2969638c1aa5a | |
| parent | d2e2fd98e0b0cbb233481822301c1757ddd69be2 (diff) | |
target: Don't allow setting WC emulation if device doesn't support
commit 07b8dae38b09bcfede7e726f172e39b5ce8390d9 upstream.
Just like for pSCSI, if the transport sets get_write_cache, then it is
not valid to enable write cache emulation for it. Return an error.
see https://bugzilla.redhat.com/show_bug.cgi?id=1082675
Reviewed-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/target/target_core_device.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 382b66b212a..26416c15d65 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -798,10 +798,10 @@ int se_dev_set_emulate_write_cache(struct se_device *dev, int flag) pr_err("emulate_write_cache not supported for pSCSI\n"); return -EINVAL; } - if (dev->transport->get_write_cache) { - pr_warn("emulate_write_cache cannot be changed when underlying" - " HW reports WriteCacheEnabled, ignoring request\n"); - return 0; + if (flag && + dev->transport->get_write_cache) { + pr_err("emulate_write_cache not supported for this device\n"); + return -EINVAL; } dev->dev_attrib.emulate_write_cache = flag; |