From 88dd9e26d6d3e743f9c7e4562b94b2ad3c2994d3 Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Wed, 2 Nov 2011 03:33:16 -0700 Subject: 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: Nicholas Bellinger --- drivers/target/loopback/tcm_loop.c | 5 +++-- drivers/target/target_core_transport.c | 7 +++++-- drivers/target/tcm_fc/tcm_fc.h | 2 +- drivers/target/tcm_fc/tfc_cmd.c | 3 ++- 4 files changed, 11 insertions(+), 6 deletions(-) (limited to 'drivers/target') diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c index 3c9c318..3df1c9b 100644 --- a/drivers/target/loopback/tcm_loop.c +++ b/drivers/target/loopback/tcm_loop.c @@ -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) diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 5dee446..bf8867f 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -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); diff --git a/drivers/target/tcm_fc/tcm_fc.h b/drivers/target/tcm_fc/tcm_fc.h index 3749d8b..e05c551 100644 --- a/drivers/target/tcm_fc/tcm_fc.h +++ b/drivers/target/tcm_fc/tcm_fc.h @@ -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 *); diff --git a/drivers/target/tcm_fc/tfc_cmd.c b/drivers/target/tcm_fc/tfc_cmd.c index 6195026..4fac37c 100644 --- a/drivers/target/tcm_fc/tfc_cmd.c +++ b/drivers/target/tcm_fc/tfc_cmd.c @@ -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; } /* -- cgit v1.1