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target: Stop execution if CMD_T_STOP has been set 

Stop execution if CMD_T_STOP has been set for a command just after
the command has been added to the device command list and before
.write_pending() is called. The following sequence can trigger this:
- transport_handle_cdb_direct() gets called. This function namely
  sets CMD_T_ACTIVE before it calls transport_generic_new_cmd().
- __transport_wait_for_tasks() is called concurrently. This function
  sets CMD_T_STOP for all active commands that have not been aborted.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andy Grover <agrover@redhat.com>
Cc: David Disseldorp <ddiss@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Bart Van Assche 2017-01-09 10:14:54 -08:00 committed by Nicholas Bellinger
parent 2d4760ee47
commit a5eb307f37
1 changed files with 2 additions and 1 deletions
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3
drivers/target/target_core_transport.c
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@ -2452,7 +2452,8 @@ transport_generic_new_cmd(struct se_cmd *cmd)
target_execute_cmd(cmd);
return 0;
}
transport_cmd_check_stop(cmd, false, true);
if (transport_cmd_check_stop(cmd, false, true))
return 0;
ret = cmd->se_tfo->write_pending(cmd);
if (ret == -EAGAIN || ret == -ENOMEM)