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author | Nicholas Bellinger <nab@linux-iscsi.org> | 2016-05-18 05:19:10 (GMT) |
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committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2016-07-20 07:58:38 (GMT) |
commit | dff0ca9ea7dc8be2181a62df4a722c32ce68ff4a (patch) | |
tree | 5a8fad3a30d78857da00f4be6952c4f16c95f35c /drivers/target/target_core_internal.h | |
parent | ea263c7fada4af8ec7fe5fcfd6e7d7705a89351b (diff) | |
download | linux-dff0ca9ea7dc8be2181a62df4a722c32ce68ff4a.tar.xz |
target: Fix ordered task target_setup_cmd_from_cdb exception hang
If a command with a Simple task attribute is failed due to a Unit
Attention, then a subsequent command with an Ordered task attribute
will hang forever. The reason for this is that the Unit Attention
status is checked for in target_setup_cmd_from_cdb, before the call
to target_execute_cmd, which calls target_handle_task_attr, which
in turn increments dev->simple_cmds.
However, transport_generic_request_failure still calls
transport_complete_task_attr, which will decrement dev->simple_cmds.
In this case, simple_cmds is now -1. So when a command with the
Ordered task attribute is sent, target_handle_task_attr sees that
dev->simple_cmds is not 0, so it decides it can't execute the
command until all the (nonexistent) Simple commands have completed.
Reported-by: Michael Cyr <mikecyr@linux.vnet.ibm.com>
Tested-by: Michael Cyr <mikecyr@linux.vnet.ibm.com>
Reported-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Tested-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org # 4.4+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_internal.h')
-rw-r--r-- | drivers/target/target_core_internal.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h index fc91e85..e2c970a 100644 --- a/drivers/target/target_core_internal.h +++ b/drivers/target/target_core_internal.h @@ -146,6 +146,7 @@ sense_reason_t target_cmd_size_check(struct se_cmd *cmd, unsigned int size); void target_qf_do_work(struct work_struct *work); bool target_check_wce(struct se_device *dev); bool target_check_fua(struct se_device *dev); +void __target_execute_cmd(struct se_cmd *, bool); /* target_core_stat.c */ void target_stat_setup_dev_default_groups(struct se_device *); |