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target: Simplify LUN shutdown code 

Instead of starting a thread from transport_clear_lun_ref() that
waits for LUN shutdown, wait in that function for LUN shutdown
to finish. Additionally, change the return type of
transport_clear_lun_ref() from int to void.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Bart Van Assche 2015-05-19 16:16:01 +02:00 committed by Nicholas Bellinger
parent 3effdb9094
commit b3eeea6619
5 changed files with 2 additions and 27 deletions
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1
drivers/target/target_core_device.c
View File

@ -928,7 +928,6 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
xcopy_lun = &dev->xcopy_lun;
xcopy_lun->lun_se_dev = dev;
init_completion(&xcopy_lun->lun_shutdown_comp);
spin_lock_init(&xcopy_lun->lun_sep_lock);
init_completion(&xcopy_lun->lun_ref_comp);

2
drivers/target/target_core_internal.h
View File

@ -108,7 +108,7 @@ int transport_dump_vpd_assoc(struct t10_vpd *, unsigned char *, int);
int transport_dump_vpd_ident_type(struct t10_vpd *, unsigned char *, int);
int transport_dump_vpd_ident(struct t10_vpd *, unsigned char *, int);
bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags);
int transport_clear_lun_ref(struct se_lun *);
void transport_clear_lun_ref(struct se_lun *);
void transport_send_task_abort(struct se_cmd *);
sense_reason_t target_cmd_size_check(struct se_cmd *cmd, unsigned int size);
void target_qf_do_work(struct work_struct *work);

2
drivers/target/target_core_tpg.c
View File

@ -494,7 +494,6 @@ static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
lun->unpacked_lun = 0;
atomic_set(&lun->lun_acl_count, 0);
init_completion(&lun->lun_shutdown_comp);
spin_lock_init(&lun->lun_sep_lock);
init_completion(&lun->lun_ref_comp);
@ -606,7 +605,6 @@ struct se_lun *core_tpg_alloc_lun(
lun->unpacked_lun = unpacked_lun;
lun->lun_link_magic = SE_LUN_LINK_MAGIC;
atomic_set(&lun->lun_acl_count, 0);
init_completion(&lun->lun_shutdown_comp);
spin_lock_init(&lun->lun_sep_lock);
init_completion(&lun->lun_ref_comp);

23
drivers/target/target_core_transport.c
View File

@ -2596,31 +2596,10 @@ void target_wait_for_sess_cmds(struct se_session *se_sess)
}
EXPORT_SYMBOL(target_wait_for_sess_cmds);
static int transport_clear_lun_ref_thread(void *p)
void transport_clear_lun_ref(struct se_lun *lun)
{
struct se_lun *lun = p;
percpu_ref_kill(&lun->lun_ref);
wait_for_completion(&lun->lun_ref_comp);
complete(&lun->lun_shutdown_comp);
return 0;
}
int transport_clear_lun_ref(struct se_lun *lun)
{
struct task_struct *kt;
kt = kthread_run(transport_clear_lun_ref_thread, lun,
"tcm_cl_%u", lun->unpacked_lun);
if (IS_ERR(kt)) {
pr_err("Unable to start clear_lun thread\n");
return PTR_ERR(kt);
}
wait_for_completion(&lun->lun_shutdown_comp);
return 0;
}
/**

1
include/target/target_core_base.h
View File

@ -707,7 +707,6 @@ struct se_lun {
u32 lun_index;
atomic_t lun_acl_count;
spinlock_t lun_sep_lock;
struct completion lun_shutdown_comp;
struct se_device *lun_se_dev;
struct se_port *lun_sep;
struct config_group lun_group;