From: Nicholas Bellinger Date: Fri, 13 Jan 2012 20:01:34 +0000 (-0800) Subject: target: Add workaround for zero-length control CDB handling X-Git-Tag: v3.3-rc3~2^2~20 X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-linux.git;a=commitdiff_plain;h=91ec1d3535b2acf12c599045cc19ad9be3c6a47b target: Add workaround for zero-length control CDB handling 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 Cc: Signed-off-by: Nicholas Bellinger --- diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 2869fb7d2c05..50d6911d4120 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -3759,6 +3759,11 @@ 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; @@ -3830,6 +3835,14 @@ 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;