forked from Minki/linux
[SCSI] pm8001: simplify workqueue usage
pm8001 manages its own list of pending works and cancel them on device free. It is unnecessarily complex and has a race condition - the works are canceled but not synced, so the work could still be running during and after the data structures are freed. This patch simplifies workqueue usage. * A driver specific workqueue pm8001_wq is created to serve these work items. * To avoid confusion, the "queue" suffixes are dropped from work items and functions. * Delayed queueing was never used. pm8001_work now uses work_struct instead. * The driver no longer keeps track of pending works. All pm8001_works are queued to pm8001_wq and the workqueue is flushed as necessary. flush_scheduled_work() usage is removed during conversion. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Jack Wang <jack_wang@usish.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Tejun Heo
James Bottomley
parent
a684b8da35
commit
429305e465
@ -1382,53 +1382,50 @@ static u32 mpi_msg_consume(struct pm8001_hba_info *pm8001_ha,
|
||||
return MPI_IO_STATUS_BUSY;
|
||||
}
|
||||
|
||||
static void pm8001_work_queue(struct work_struct *work)
|
||||
static void pm8001_work_fn(struct work_struct *work)
|
||||
{
|
||||
struct delayed_work *dw = container_of(work, struct delayed_work, work);
|
||||
struct pm8001_wq *wq = container_of(dw, struct pm8001_wq, work_q);
|
||||
struct pm8001_work *pw = container_of(work, struct pm8001_work, work);
|
||||
struct pm8001_device *pm8001_dev;
|
||||
struct domain_device *dev;
|
||||
struct domain_device *dev;
|
||||
|
||||
switch (wq->handler) {
|
||||
switch (pw->handler) {
|
||||
case IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS:
|
||||
pm8001_dev = wq->data;
|
||||
pm8001_dev = pw->data;
|
||||
dev = pm8001_dev->sas_device;
|
||||
pm8001_I_T_nexus_reset(dev);
|
||||
break;
|
||||
case IO_OPEN_CNX_ERROR_STP_RESOURCES_BUSY:
|
||||
pm8001_dev = wq->data;
|
||||
pm8001_dev = pw->data;
|
||||
dev = pm8001_dev->sas_device;
|
||||
pm8001_I_T_nexus_reset(dev);
|
||||
break;
|
||||
case IO_DS_IN_ERROR:
|
||||
pm8001_dev = wq->data;
|
||||
pm8001_dev = pw->data;
|
||||
dev = pm8001_dev->sas_device;
|
||||
pm8001_I_T_nexus_reset(dev);
|
||||
break;
|
||||
case IO_DS_NON_OPERATIONAL:
|
||||
pm8001_dev = wq->data;
|
||||
pm8001_dev = pw->data;
|
||||
dev = pm8001_dev->sas_device;
|
||||
pm8001_I_T_nexus_reset(dev);
|
||||
break;
|
||||
}
|
||||
list_del(&wq->entry);
|
||||
kfree(wq);
|
||||
kfree(pw);
|
||||
}
|
||||
|
||||
static int pm8001_handle_event(struct pm8001_hba_info *pm8001_ha, void *data,
|
||||
int handler)
|
||||
{
|
||||
struct pm8001_wq *wq;
|
||||
struct pm8001_work *pw;
|
||||
int ret = 0;
|
||||
|
||||
wq = kmalloc(sizeof(struct pm8001_wq), GFP_ATOMIC);
|
||||
if (wq) {
|
||||
wq->pm8001_ha = pm8001_ha;
|
||||
wq->data = data;
|
||||
wq->handler = handler;
|
||||
INIT_DELAYED_WORK(&wq->work_q, pm8001_work_queue);
|
||||
list_add_tail(&wq->entry, &pm8001_ha->wq_list);
|
||||
schedule_delayed_work(&wq->work_q, 0);
|
||||
pw = kmalloc(sizeof(struct pm8001_work), GFP_ATOMIC);
|
||||
if (pw) {
|
||||
pw->pm8001_ha = pm8001_ha;
|
||||
pw->data = data;
|
||||
pw->handler = handler;
|
||||
INIT_WORK(&pw->work, pm8001_work_fn);
|
||||
queue_work(pm8001_wq, &pw->work);
|
||||
} else
|
||||
ret = -ENOMEM;
|
||||
|
||||
|
||||
@ -51,6 +51,8 @@ static int pm8001_id;
|
||||
|
||||
LIST_HEAD(hba_list);
|
||||
|
||||
struct workqueue_struct *pm8001_wq;
|
||||
|
||||
/**
|
||||
* The main structure which LLDD must register for scsi core.
|
||||
*/
|
||||
@ -134,7 +136,6 @@ static void __devinit pm8001_phy_init(struct pm8001_hba_info *pm8001_ha,
|
||||
static void pm8001_free(struct pm8001_hba_info *pm8001_ha)
|
||||
{
|
||||
int i;
|
||||
struct pm8001_wq *wq;
|
||||
|
||||
if (!pm8001_ha)
|
||||
return;
|
||||
@ -150,8 +151,7 @@ static void pm8001_free(struct pm8001_hba_info *pm8001_ha)
|
||||
PM8001_CHIP_DISP->chip_iounmap(pm8001_ha);
|
||||
if (pm8001_ha->shost)
|
||||
scsi_host_put(pm8001_ha->shost);
|
||||
list_for_each_entry(wq, &pm8001_ha->wq_list, entry)
|
||||
cancel_delayed_work(&wq->work_q);
|
||||
flush_workqueue(pm8001_wq);
|
||||
kfree(pm8001_ha->tags);
|
||||
kfree(pm8001_ha);
|
||||
}
|
||||
@ -381,7 +381,6 @@ pm8001_pci_alloc(struct pci_dev *pdev, u32 chip_id, struct Scsi_Host *shost)
|
||||
pm8001_ha->sas = sha;
|
||||
pm8001_ha->shost = shost;
|
||||
pm8001_ha->id = pm8001_id++;
|
||||
INIT_LIST_HEAD(&pm8001_ha->wq_list);
|
||||
pm8001_ha->logging_level = 0x01;
|
||||
sprintf(pm8001_ha->name, "%s%d", DRV_NAME, pm8001_ha->id);
|
||||
#ifdef PM8001_USE_TASKLET
|
||||
@ -758,7 +757,7 @@ static int pm8001_pci_suspend(struct pci_dev *pdev, pm_message_t state)
|
||||
int i , pos;
|
||||
u32 device_state;
|
||||
pm8001_ha = sha->lldd_ha;
|
||||
flush_scheduled_work();
|
||||
flush_workqueue(pm8001_wq);
|
||||
scsi_block_requests(pm8001_ha->shost);
|
||||
pos = pci_find_capability(pdev, PCI_CAP_ID_PM);
|
||||
if (pos == 0) {
|
||||
@ -870,17 +869,26 @@ static struct pci_driver pm8001_pci_driver = {
|
||||
*/
|
||||
static int __init pm8001_init(void)
|
||||
{
|
||||
int rc;
|
||||
int rc = -ENOMEM;
|
||||
|
||||
pm8001_wq = alloc_workqueue("pm8001", 0, 0);
|
||||
if (!pm8001_wq)
|
||||
goto err;
|
||||
|
||||
pm8001_id = 0;
|
||||
pm8001_stt = sas_domain_attach_transport(&pm8001_transport_ops);
|
||||
if (!pm8001_stt)
|
||||
return -ENOMEM;
|
||||
goto err_wq;
|
||||
rc = pci_register_driver(&pm8001_pci_driver);
|
||||
if (rc)
|
||||
goto err_out;
|
||||
goto err_tp;
|
||||
return 0;
|
||||
err_out:
|
||||
|
||||
err_tp:
|
||||
sas_release_transport(pm8001_stt);
|
||||
err_wq:
|
||||
destroy_workqueue(pm8001_wq);
|
||||
err:
|
||||
return rc;
|
||||
}
|
||||
|
||||
@ -888,6 +896,7 @@ static void __exit pm8001_exit(void)
|
||||
{
|
||||
pci_unregister_driver(&pm8001_pci_driver);
|
||||
sas_release_transport(pm8001_stt);
|
||||
destroy_workqueue(pm8001_wq);
|
||||
}
|
||||
|
||||
module_init(pm8001_init);
|
||||
|
||||
@ -50,6 +50,7 @@
|
||||
#include <linux/dma-mapping.h>
|
||||
#include <linux/pci.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/workqueue.h>
|
||||
#include <scsi/libsas.h>
|
||||
#include <scsi/scsi_tcq.h>
|
||||
#include <scsi/sas_ata.h>
|
||||
@ -379,18 +380,16 @@ struct pm8001_hba_info {
|
||||
#ifdef PM8001_USE_TASKLET
|
||||
struct tasklet_struct tasklet;
|
||||
#endif
|
||||
struct list_head wq_list;
|
||||
u32 logging_level;
|
||||
u32 fw_status;
|
||||
const struct firmware *fw_image;
|
||||
};
|
||||
|
||||
struct pm8001_wq {
|
||||
struct delayed_work work_q;
|
||||
struct pm8001_work {
|
||||
struct work_struct work;
|
||||
struct pm8001_hba_info *pm8001_ha;
|
||||
void *data;
|
||||
int handler;
|
||||
struct list_head entry;
|
||||
};
|
||||
|
||||
struct pm8001_fw_image_header {
|
||||
@ -460,6 +459,9 @@ struct fw_control_ex {
|
||||
void *param3;
|
||||
};
|
||||
|
||||
/* pm8001 workqueue */
|
||||
extern struct workqueue_struct *pm8001_wq;
|
||||
|
||||
/******************** function prototype *********************/
|
||||
int pm8001_tag_alloc(struct pm8001_hba_info *pm8001_ha, u32 *tag_out);
|
||||
void pm8001_tag_init(struct pm8001_hba_info *pm8001_ha);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user