Commit 88dd9e26 authored by Nicholas Bellinger's avatar Nicholas Bellinger

target: Make TFO->check_stop_free return free status

This patch converts target_core_fabric_ops->check_stop_free() usage in
transport_cmd_check_stop() and associated fabric module usage to
return '1' when the passed se_cmd has been released directly within
->check_stop_free(), or return '0' when the passed se_cmd has not
been released.

This addresses an issue where transport_cmd_finish_abort() ->
transport_cmd_check_stop_to_fabric() was leaking descriptors during
LUN_RESET for modules using ->check_stop_free(), but not directly
releasing se_cmd in all cases.

Cc: stable@kernel.org
Signed-off-by: default avatarNicholas Bellinger <nab@risingtidesystems.com>
parent 5a4c8666
......@@ -205,7 +205,7 @@ static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd)
/*
* Called from struct target_core_fabric_ops->check_stop_free()
*/
static void tcm_loop_check_stop_free(struct se_cmd *se_cmd)
static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
{
/*
* Do not release struct se_cmd's containing a valid TMR
......@@ -213,12 +213,13 @@ static void tcm_loop_check_stop_free(struct se_cmd *se_cmd)
* with transport_generic_free_cmd().
*/
if (se_cmd->se_tmr_req)
return;
return 0;
/*
* Release the struct se_cmd, which will make a callback to release
* struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
*/
transport_generic_free_cmd(se_cmd, 0);
return 1;
}
static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
......
......@@ -514,13 +514,16 @@ static int transport_cmd_check_stop(
* Some fabric modules like tcm_loop can release
* their internally allocated I/O reference now and
* struct se_cmd now.
*
* Fabric modules are expected to return '1' here if the
* se_cmd being passed is released at this point,
* or zero if not being released.
*/
if (cmd->se_tfo->check_stop_free != NULL) {
spin_unlock_irqrestore(
&cmd->t_state_lock, flags);
cmd->se_tfo->check_stop_free(cmd);
return 1;
return cmd->se_tfo->check_stop_free(cmd);
}
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
......
......@@ -156,7 +156,7 @@ int ft_lport_notify(struct notifier_block *, unsigned long, void *);
/*
* IO methods.
*/
void ft_check_stop_free(struct se_cmd *);
int ft_check_stop_free(struct se_cmd *);
void ft_release_cmd(struct se_cmd *);
int ft_queue_status(struct se_cmd *);
int ft_queue_data_in(struct se_cmd *);
......
......@@ -112,9 +112,10 @@ void ft_release_cmd(struct se_cmd *se_cmd)
ft_free_cmd(cmd);
}
void ft_check_stop_free(struct se_cmd *se_cmd)
int ft_check_stop_free(struct se_cmd *se_cmd)
{
transport_generic_free_cmd(se_cmd, 0);
return 1;
}
/*
......
......@@ -46,9 +46,12 @@ struct target_core_fabric_ops {
int (*new_cmd_map)(struct se_cmd *);
/*
* Optional to release struct se_cmd and fabric dependent allocated
* I/O descriptor in transport_cmd_check_stop()
* I/O descriptor in transport_cmd_check_stop().
*
* Returning 1 will signal a descriptor has been released.
* Returning 0 will signal a descriptor has not been released.
*/
void (*check_stop_free)(struct se_cmd *);
int (*check_stop_free)(struct se_cmd *);
void (*release_cmd)(struct se_cmd *);
/*
* Called with spin_lock_bh(struct se_portal_group->session_lock held.
......
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