On Tue, 14 Feb 2006, Christoph Hellwig wrote:
> Use the kthread_ API instead of opencoding lots of hairy code for kernel
> thread creation and teardown.
>
> Also switch from semaphore-based thread wakeup to wake_up_process.
>
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Ack. Thanks for doing this.
I've also rebased it against the lastest linux-2.6.git tree to correct
the rejected hunk and additonal DPC ringing done in qla_sup.c.
I've added something similar to qla4xxx (which I hope will be
submitted soon... nudge...nudge...).
--
av
---
diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index b31a03b..2e16f32 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -2414,11 +2414,7 @@ typedef struct scsi_qla_host {
struct sns_cmd_pkt *sns_cmd;
dma_addr_t sns_cmd_dma;
- pid_t dpc_pid;
- int dpc_should_die;
- struct completion dpc_inited;
- struct completion dpc_exited;
- struct semaphore *dpc_wait;
+ struct task_struct *dpc_thread;
uint8_t dpc_active; /* DPC routine is active */
/* Timeout timers. */
diff --git a/drivers/scsi/qla2xxx/qla_gbl.h b/drivers/scsi/qla2xxx/qla_gbl.h
index ffdc268..e897ead 100644
--- a/drivers/scsi/qla2xxx/qla_gbl.h
+++ b/drivers/scsi/qla2xxx/qla_gbl.h
@@ -81,6 +81,8 @@ extern struct fw_blob *qla2x00_request_f
extern int qla2x00_wait_for_hba_online(scsi_qla_host_t *);
+extern void qla2xxx_wake_dpc(scsi_qla_host_t *);
+
/*
* Global Function Prototypes in qla_iocb.c source file.
*/
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 42aa7a7..c15458c 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -838,9 +838,7 @@ qla2x00_status_entry(scsi_qla_host_t *ha
qla_printk(KERN_WARNING, ha, "Status Entry invalid handle.\n");
set_bit(ISP_ABORT_NEEDED, &ha->dpc_flags);
- if (ha->dpc_wait && !ha->dpc_active)
- up(ha->dpc_wait);
-
+ qla2xxx_wake_dpc(ha);
return;
}
cp = sp->cmd;
@@ -1271,8 +1269,7 @@ qla2x00_error_entry(scsi_qla_host_t *ha,
"Error entry - invalid handle\n");
set_bit(ISP_ABORT_NEEDED, &ha->dpc_flags);
- if (ha->dpc_wait && !ha->dpc_active)
- up(ha->dpc_wait);
+ qla2xxx_wake_dpc(ha);
}
}
diff --git a/drivers/scsi/qla2xxx/qla_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c
index 363dfdd..584cc2f 100644
--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -284,9 +284,7 @@ qla2x00_mailbox_command(scsi_qla_host_t
"Mailbox command timeout occured. Scheduling ISP "
"abort.\n");
set_bit(ISP_ABORT_NEEDED, &ha->dpc_flags);
- if (ha->dpc_wait && !ha->dpc_active)
- up(ha->dpc_wait);
-
+ qla2xxx_wake_dpc(ha);
} else if (!abort_active) {
/* call abort directly since we are in the DPC thread */
DEBUG(printk("%s(%ld): timeout calling abort_isp\n",
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 9f91f1a..43ca0d8 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -8,8 +8,8 @@
#include <linux/moduleparam.h>
#include <linux/vmalloc.h>
-#include <linux/smp_lock.h>
#include <linux/delay.h>
+#include <linux/kthread.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsicam.h>
@@ -1307,8 +1307,6 @@ int qla2x00_probe_one(struct pci_dev *pd
ha->brd_info = brd_info;
sprintf(ha->host_str, "%s_%ld", ha->brd_info->drv_name, ha->host_no);
- ha->dpc_pid = -1;
-
/* Configure PCI I/O space */
ret = qla2x00_iospace_config(ha);
if (ret)
@@ -1449,9 +1447,6 @@ int qla2x00_probe_one(struct pci_dev *pd
*/
spin_lock_init(&ha->mbx_reg_lock);
- init_completion(&ha->dpc_inited);
- init_completion(&ha->dpc_exited);
-
qla2x00_config_dma_addressing(ha);
if (qla2x00_mem_alloc(ha)) {
qla_printk(KERN_WARNING, ha,
@@ -1478,16 +1473,14 @@ int qla2x00_probe_one(struct pci_dev *pd
/*
* Startup the kernel thread for this host adapter
*/
- ha->dpc_should_die = 0;
- ha->dpc_pid = kernel_thread(qla2x00_do_dpc, ha, 0);
- if (ha->dpc_pid < 0) {
+ ha->dpc_thread = kthread_create(qla2x00_do_dpc, ha,
+ "%s_dpc", ha->host_str);
+ if (IS_ERR(ha->dpc_thread)) {
qla_printk(KERN_WARNING, ha,
"Unable to start DPC thread!\n");
-
- ret = -ENODEV;
+ ret = PTR_ERR(ha->dpc_thread);
goto probe_failed;
}
- wait_for_completion(&ha->dpc_inited);
host->this_id = 255;
host->cmd_per_lun = 3;
@@ -1621,8 +1614,6 @@ EXPORT_SYMBOL_GPL(qla2x00_remove_one);
static void
qla2x00_free_device(scsi_qla_host_t *ha)
{
- int ret;
-
/* Abort any outstanding IO descriptors. */
if (!IS_QLA2100(ha) && !IS_QLA2200(ha))
qla2x00_cancel_io_descriptors(ha);
@@ -1632,18 +1623,15 @@ qla2x00_free_device(scsi_qla_host_t *ha)
qla2x00_stop_timer(ha);
/* Kill the kernel thread for this host */
- if (ha->dpc_pid >= 0) {
- ha->dpc_should_die = 1;
- wmb();
- ret = kill_proc(ha->dpc_pid, SIGHUP, 1);
- if (ret) {
- qla_printk(KERN_ERR, ha,
- "Unable to signal DPC thread -- (%d)\n", ret);
+ if (ha->dpc_thread) {
+ struct task_struct *t = ha->dpc_thread;
- /* TODO: SOMETHING MORE??? */
- } else {
- wait_for_completion(&ha->dpc_exited);
- }
+ /*
+ * qla2xxx_wake_dpc checks for ->dpc_thread
+ * so we need to zero it out.
+ */
+ ha->dpc_thread = NULL;
+ kthread_stop(t);
}
/* Stop currently executing firmware. */
@@ -1775,8 +1763,8 @@ qla2x00_mark_all_devices_lost(scsi_qla_h
atomic_set(&fcport->state, FCS_DEVICE_LOST);
}
- if (defer && ha->dpc_wait && !ha->dpc_active)
- up(ha->dpc_wait);
+ if (defer)
+ qla2xxx_wake_dpc(ha);
}
/*
@@ -1993,7 +1981,6 @@ qla2x00_mem_free(scsi_qla_host_t *ha)
{
struct list_head *fcpl, *fcptemp;
fc_port_t *fcport;
- unsigned int wtime;/* max wait time if mbx cmd is busy. */
if (ha == NULL) {
/* error */
@@ -2001,11 +1988,6 @@ qla2x00_mem_free(scsi_qla_host_t *ha)
return;
}
- /* Make sure all other threads are stopped. */
- wtime = 60 * 1000;
- while (ha->dpc_wait && wtime)
- wtime = msleep_interruptible(wtime);
-
/* free ioctl memory */
qla2x00_free_ioctl_mem(ha);
@@ -2156,7 +2138,6 @@ qla2x00_free_sp_pool( scsi_qla_host_t *h
static int
qla2x00_do_dpc(void *data)
{
- DECLARE_MUTEX_LOCKED(sem);
scsi_qla_host_t *ha;
fc_port_t *fcport;
uint8_t status;
@@ -2164,32 +2145,19 @@ qla2x00_do_dpc(void *data)
ha = (scsi_qla_host_t *)data;
- lock_kernel();
-
- daemonize("%s_dpc", ha->host_str);
- allow_signal(SIGHUP);
-
- ha->dpc_wait = &sem;
-
set_user_nice(current, -20);
- unlock_kernel();
-
- complete(&ha->dpc_inited);
-
- while (1) {
+ while (!kthread_should_stop()) {
DEBUG3(printk("qla2x00: DPC handler sleeping\n"));
- if (down_interruptible(&sem))
- break;
-
- if (ha->dpc_should_die)
- break;
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ __set_current_state(TASK_RUNNING);
DEBUG3(printk("qla2x00: DPC handler waking up\n"));
/* Initialization not yet finished. Don't do anything yet. */
- if (!ha->flags.init_done || ha->dpc_active)
+ if (!ha->flags.init_done)
continue;
DEBUG3(printk("scsi(%ld): DPC handler\n", ha->host_no));
@@ -2356,10 +2324,16 @@ qla2x00_do_dpc(void *data)
/*
* Make sure that nobody tries to wake us up again.
*/
- ha->dpc_wait = NULL;
ha->dpc_active = 0;
- complete_and_exit(&ha->dpc_exited, 0);
+ return 0;
+}
+
+void
+qla2xxx_wake_dpc(scsi_qla_host_t *ha)
+{
+ if (ha->dpc_thread)
+ wake_up_process(ha->dpc_thread);
}
/*
@@ -2540,11 +2514,8 @@ qla2x00_timer(scsi_qla_host_t *ha)
test_bit(LOGIN_RETRY_NEEDED, &ha->dpc_flags) ||
test_bit(RESET_MARKER_NEEDED, &ha->dpc_flags) ||
test_bit(BEACON_BLINK_NEEDED, &ha->dpc_flags) ||
- test_bit(RELOGIN_NEEDED, &ha->dpc_flags)) &&
- ha->dpc_wait && !ha->dpc_active) {
-
- up(ha->dpc_wait);
- }
+ test_bit(RELOGIN_NEEDED, &ha->dpc_flags)))
+ qla2xxx_wake_dpc(ha);
qla2x00_restart_timer(ha, WATCH_INTERVAL);
}
diff --git a/drivers/scsi/qla2xxx/qla_sup.c b/drivers/scsi/qla2xxx/qla_sup.c
index 3866a57..8d68c46 100644
--- a/drivers/scsi/qla2xxx/qla_sup.c
+++ b/drivers/scsi/qla2xxx/qla_sup.c
@@ -1354,7 +1354,7 @@ qla2x00_resume_hba(struct scsi_qla_host
/* Resume HBA. */
clear_bit(MBX_UPDATE_FLASH_ACTIVE, &ha->mbx_cmd_flags);
set_bit(ISP_ABORT_NEEDED, &ha->dpc_flags);
- up(ha->dpc_wait);
+ qla2xxx_wake_dpc(ha);
qla2x00_wait_for_hba_online(ha);
scsi_unblock_requests(ha->host);
}
@@ -1652,7 +1652,7 @@ qla24xx_write_optrom_data(struct scsi_ql
/* Resume HBA -- RISC reset needed. */
clear_bit(MBX_UPDATE_FLASH_ACTIVE, &ha->mbx_cmd_flags);
set_bit(ISP_ABORT_NEEDED, &ha->dpc_flags);
- up(ha->dpc_wait);
+ qla2xxx_wake_dpc(ha);
qla2x00_wait_for_hba_online(ha);
scsi_unblock_requests(ha->host);
-
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