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scsi: target: usb: gadget: Convert to new submission API 

target_submit_cmd() is now only for simple drivers that do their own sync
during shutdown and do not use target_stop_session(). It will never return
a failure, so we can remove that code from the driver.

Note: Before these patches target_submit_cmd() would never return an error
for usb since it does not use target_stop_session(). If it did then we
would have hit a refcount error here:

    transport_send_check_condition_and_sense(se_cmd,
                             TCM_UNSUPPORTED_SCSI_OPCODE, 1);
    transport_generic_free_cmd(&cmd->se_cmd, 0);

transport_send_check_condition_and_sense() calls queue_status and the
driver can sometimes do transport_generic_free_cmd() from there via
uasp_status_data_cmpl(). In that case, the above
transport_generic_free_cmd() would then hit a refcount error.

So that other use of the above error path in the driver is also probably
wrong, but someone with the hardware needs to fix that.

Link: https://lore.kernel.org/r/20210227170006.5077-11-michael.christie@oracle.com
Cc: Felipe Balbi <balbi@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2021-02-27 10:59:51 -06:00 committed by Martin K. Petersen
parent c7e086b8d7
commit 12340930a3
1 changed files with 6 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/usb/gadget/function/f_tcm.c
View File

@ -1058,11 +1058,9 @@ static void usbg_cmd_work(struct work_struct *work)
goto out;
}
if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf,
cmd->sense_iu.sense, cmd->unpacked_lun, 0,
cmd->prio_attr, dir, flags) < 0)
goto out;
target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf,
cmd->sense_iu.sense, cmd->unpacked_lun, 0,
cmd->prio_attr, dir, flags);
return;
out:
@ -1189,11 +1187,9 @@ static void bot_cmd_work(struct work_struct *work)
goto out;
}
if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
cmd->data_len, cmd->prio_attr, dir, 0) < 0)
goto out;
target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
cmd->data_len, cmd->prio_attr, dir, 0);
return;
out: