diff options
| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-01-13 12:01:34 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-13 11:17:02 -0800 |
| commit | f467de45d956d46c692fd6a2331f296e9e872aba (patch) | |
| tree | f460107b472ea4e5e3ca92b27cc8dfdfeb5f1806 | |
| parent | f4d055fceeb62aca2303fe076d17005a662690a3 (diff) | |
target: Add workaround for zero-length control CDB handling
commit 91ec1d3535b2acf12c599045cc19ad9be3c6a47b upstream.
This patch adds a work-around for handling zero allocation length
control CDBs (type SCF_SCSI_CONTROL_SG_IO_CDB) that was causing an
OOPs with the following raw calls:
# sg_raw -v /dev/sdd 3 0 0 0 0 0
# sg_raw -v /dev/sdd 0x1a 0 1 0 0 0
This patch will follow existing zero-length handling for data I/O
and silently return with GOOD status. This addresses the zero length
issue, but the proper long-term resolution for handling arbitary
allocation lengths will be to refactor out data-phase handling in
individual CDB emulation logic within target_core_cdb.c
Reported-by: Roland Dreier <roland@purestorage.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_transport.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 4f99d4c1ebab..861628eb2da2 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -3701,6 +3701,11 @@ transport_allocate_control_task(struct se_cmd *cmd) struct se_task *task; unsigned long flags; + /* Workaround for handling zero-length control CDBs */ + if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) && + !cmd->data_length) + return 0; + task = transport_generic_get_task(cmd, cmd->data_direction); if (!task) return -ENOMEM; @@ -3772,6 +3777,14 @@ int transport_generic_new_cmd(struct se_cmd *cmd) else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) { cmd->t_state = TRANSPORT_COMPLETE; atomic_set(&cmd->t_transport_active, 1); + + if (cmd->t_task_cdb[0] == REQUEST_SENSE) { + u8 ua_asc = 0, ua_ascq = 0; + + core_scsi3_ua_clear_for_request_sense(cmd, + &ua_asc, &ua_ascq); + } + INIT_WORK(&cmd->work, target_complete_ok_work); queue_work(target_completion_wq, &cmd->work); return 0; |