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Date: Tue, 7 Nov 2006 16:55:52 +0100
From: Cornelia Huck <cornelia.huck@...ibm.com>
To: linux-kernel <linux-kernel@...r.kernel.org>
Subject: [RFC/Patch 3/5] s390: Prepatory cleanup in common I/O layer.
From: Cornelia Huck <cornelia.huck@...ibm.com>
Some preparations for the dynamic subchannel mapping patch.
- Move adding subchannel attributes to css_register_subchannel().
- Don't call device_trigger_reprobe() for non-operational devices.
- Introduce io_subchannel_create_ccwdev().
Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
---
drivers/s390/cio/css.c | 13 +++--
drivers/s390/cio/css.h | 2
drivers/s390/cio/device.c | 102 +++++++++++++++++++++++++-----------------
drivers/s390/cio/device_fsm.c | 3 -
4 files changed, 75 insertions(+), 45 deletions(-)
--- linux-2.6-CH.orig/drivers/s390/cio/css.c
+++ linux-2.6-CH/drivers/s390/cio/css.c
@@ -135,14 +135,19 @@ css_register_subchannel(struct subchanne
sch->dev.parent = &css[0]->device;
sch->dev.bus = &css_bus_type;
sch->dev.release = &css_subchannel_release;
-
+
/* make it known to the system */
ret = css_sch_device_register(sch);
- if (ret)
+ if (ret) {
printk (KERN_WARNING "%s: could not register %s\n",
__func__, sch->dev.bus_id);
- else
- css_get_ssd_info(sch);
+ return ret;
+ }
+ css_get_ssd_info(sch);
+ ret = subchannel_add_files(&sch->dev);
+ if (ret)
+ printk(KERN_WARNING "%s: could not add attributes to %s\n",
+ __func__, sch->dev.bus_id);
return ret;
}
--- linux-2.6-CH.orig/drivers/s390/cio/css.h
+++ linux-2.6-CH/drivers/s390/cio/css.h
@@ -184,4 +184,6 @@ extern int need_rescan;
extern struct workqueue_struct *slow_path_wq;
extern struct work_struct slow_path_work;
+
+int subchannel_add_files (struct device *);
#endif
--- linux-2.6-CH.orig/drivers/s390/cio/device.c
+++ linux-2.6-CH/drivers/s390/cio/device.c
@@ -294,6 +294,16 @@ online_show (struct device *dev, struct
return sprintf(buf, cdev->online ? "1\n" : "0\n");
}
+static void ccw_device_unregister(void *data)
+{
+ struct ccw_device *cdev;
+
+ cdev = (struct ccw_device *)data;
+ if (test_and_clear_bit(1, &cdev->private->registered))
+ device_unregister(&cdev->dev);
+ put_device(&cdev->dev);
+}
+
static void
ccw_device_remove_disconnected(struct ccw_device *cdev)
{
@@ -498,8 +508,7 @@ static struct attribute_group subch_attr
.attrs = subch_attrs,
};
-static inline int
-subchannel_add_files (struct device *dev)
+int subchannel_add_files (struct device *dev)
{
return sysfs_create_group(&dev->kobj, &subch_attr_group);
}
@@ -673,6 +682,54 @@ ccw_device_release(struct device *dev)
kfree(cdev);
}
+static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+
+ cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
+ if (cdev) {
+ cdev->private = kzalloc(sizeof(struct ccw_device_private),
+ GFP_KERNEL | GFP_DMA);
+ if (cdev->private)
+ return cdev;
+ }
+ kfree(cdev);
+ return ERR_PTR(-ENOMEM);
+}
+
+static int io_subchannel_initialize_dev(struct subchannel *sch,
+ struct ccw_device *cdev)
+{
+ atomic_set(&cdev->private->onoff, 0);
+ cdev->dev.parent = &sch->dev;
+ cdev->dev.release = ccw_device_release;
+ INIT_LIST_HEAD(&cdev->private->kick_work.entry);
+ /* Do first half of device_register. */
+ device_initialize(&cdev->dev);
+ if (!get_device(&sch->dev)) {
+ if (cdev->dev.release)
+ cdev->dev.release(&cdev->dev);
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+ int ret;
+
+ cdev = io_subchannel_allocate_dev(sch);
+ if (!IS_ERR(cdev)) {
+ ret = io_subchannel_initialize_dev(sch, cdev);
+ if (ret) {
+ kfree(cdev);
+ cdev = ERR_PTR(ret);
+ }
+ }
+ return cdev;
+}
+
/*
* Register recognized device.
*/
@@ -707,11 +764,6 @@ io_subchannel_register(void *data)
wake_up(&ccw_device_init_wq);
return;
}
-
- ret = subchannel_add_files(cdev->dev.parent);
- if (ret)
- printk(KERN_WARNING "%s: could not add attributes to %s\n",
- __func__, sch->dev.bus_id);
put_device(&cdev->dev);
out:
cdev->private->flags.recog_done = 1;
@@ -831,7 +883,6 @@ io_subchannel_probe (struct subchannel *
cdev = sch->dev.driver_data;
device_initialize(&cdev->dev);
ccw_device_register(cdev);
- subchannel_add_files(&sch->dev);
/*
* Check if the device is already online. If it is
* the reference count needs to be corrected
@@ -844,27 +895,9 @@ io_subchannel_probe (struct subchannel *
get_device(&cdev->dev);
return 0;
}
- cdev = kzalloc (sizeof(*cdev), GFP_KERNEL);
- if (!cdev)
- return -ENOMEM;
- cdev->private = kzalloc(sizeof(struct ccw_device_private),
- GFP_KERNEL | GFP_DMA);
- if (!cdev->private) {
- kfree(cdev);
- return -ENOMEM;
- }
- atomic_set(&cdev->private->onoff, 0);
- cdev->dev.parent = &sch->dev;
- cdev->dev.release = ccw_device_release;
- INIT_LIST_HEAD(&cdev->private->kick_work.entry);
- /* Do first half of device_register. */
- device_initialize(&cdev->dev);
-
- if (!get_device(&sch->dev)) {
- if (cdev->dev.release)
- cdev->dev.release(&cdev->dev);
- return -ENODEV;
- }
+ cdev = io_subchannel_create_ccwdev(sch);
+ if (IS_ERR(cdev))
+ return PTR_ERR(cdev);
rc = io_subchannel_recog(cdev, sch);
if (rc) {
@@ -878,17 +911,6 @@ io_subchannel_probe (struct subchannel *
return rc;
}
-static void
-ccw_device_unregister(void *data)
-{
- struct ccw_device *cdev;
-
- cdev = (struct ccw_device *)data;
- if (test_and_clear_bit(1, &cdev->private->registered))
- device_unregister(&cdev->dev);
- put_device(&cdev->dev);
-}
-
static int
io_subchannel_remove (struct subchannel *sch)
{
--- linux-2.6-CH.orig/drivers/s390/cio/device_fsm.c
+++ linux-2.6-CH/drivers/s390/cio/device_fsm.c
@@ -1077,7 +1077,8 @@ device_trigger_reprobe(struct subchannel
/* Update some values. */
if (stsch(sch->schid, &sch->schib))
return;
-
+ if (!sch->schib.pmcw.dnv)
+ return;
/*
* The pim, pam, pom values may not be accurate, but they are the best
* we have before performing device selection :/
-
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