s390/cio: wait_cons_dev don't use static variable
wait_cons_dev is used to busy wait for an interrupt on the console
ccw device. Stop using the static console_subchannel and add a
parameter to this function to specify on which ccw device/subchannel
we have to do the polling.
While at it rename the function to ccw_device_wait_idle and
move it to device.c
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 986ef6a..2c1d53f 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -656,9 +656,9 @@
/*
* Use cio_tsch to update the subchannel status and call the interrupt handler
- * if status had been pending. Called with the console_subchannel lock.
+ * if status had been pending. Called with the subchannel's lock held.
*/
-static void cio_tsch(struct subchannel *sch)
+void cio_tsch(struct subchannel *sch)
{
struct irb *irb;
int irq_context;
@@ -690,22 +690,6 @@
return &console_priv;
}
-/*
- * busy wait for the next interrupt on the console
- */
-void wait_cons_dev(void)
-{
- if (!console_subchannel_in_use)
- return;
-
- while (1) {
- cio_tsch(&console_subchannel);
- if (console_subchannel.schib.scsw.cmd.actl == 0)
- break;
- udelay_simple(100);
- }
-}
-
static int
cio_test_for_console(struct subchannel_id schid, void *data)
{
diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
index 4a1ff5c..3b97c8b 100644
--- a/drivers/s390/cio/cio.h
+++ b/drivers/s390/cio/cio.h
@@ -133,6 +133,7 @@
extern struct subchannel *cio_get_console_subchannel(void);
extern spinlock_t * cio_get_console_lock(void);
extern void *cio_get_console_priv(void);
+extern void cio_tsch(struct subchannel *sch);
#else
#define cio_is_console(schid) 0
#define cio_get_console_subchannel() NULL
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index c6767f5..2e1e908 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -19,6 +19,7 @@
#include <linux/list.h>
#include <linux/device.h>
#include <linux/workqueue.h>
+#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/kernel_stat.h>
@@ -1612,13 +1613,15 @@
/* Now wait for the async. recognition to come to an end. */
spin_lock_irq(cdev->ccwlock);
while (!dev_fsm_final_state(cdev))
- wait_cons_dev();
+ ccw_device_wait_idle(cdev);
+
rc = -EIO;
if (cdev->private->state != DEV_STATE_OFFLINE)
goto out_unlock;
ccw_device_online(cdev);
while (!dev_fsm_final_state(cdev))
- wait_cons_dev();
+ ccw_device_wait_idle(cdev);
+
if (cdev->private->state != DEV_STATE_ONLINE)
goto out_unlock;
rc = 0;
@@ -1655,6 +1658,26 @@
return &console_cdev;
}
+/**
+ * ccw_device_wait_idle() - busy wait for device to become idle
+ * @cdev: ccw device
+ *
+ * Poll until activity control is zero, that is, no function or data
+ * transfer is pending/active.
+ * Called with device lock being held.
+ */
+void ccw_device_wait_idle(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+
+ while (1) {
+ cio_tsch(sch);
+ if (sch->schib.scsw.cmd.actl == 0)
+ break;
+ udelay_simple(100);
+ }
+}
+
static int ccw_device_pm_restore(struct device *dev);
int ccw_device_force_console(void)