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-rw-r--r--arch/s390/include/asm/ccwgroup.h4
-rw-r--r--drivers/s390/cio/ccwgroup.c69
-rw-r--r--drivers/s390/cio/device.c13
-rw-r--r--drivers/s390/cio/device.h1
4 files changed, 45 insertions, 42 deletions
diff --git a/arch/s390/include/asm/ccwgroup.h b/arch/s390/include/asm/ccwgroup.h
index f5cfb79..70c3d4d 100644
--- a/arch/s390/include/asm/ccwgroup.h
+++ b/arch/s390/include/asm/ccwgroup.h
@@ -66,8 +66,8 @@ struct ccwgroup_driver {
extern int ccwgroup_driver_register (struct ccwgroup_driver *cdriver);
extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);
int ccwgroup_create_dev(struct device *root, unsigned int creator_id,
- struct ccw_driver *cdrv, struct ccwgroup_driver *gdrv,
- int num_devices, const char *buf);
+ struct ccwgroup_driver *gdrv, int num_devices,
+ const char *buf);
int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
struct ccw_driver *cdrv, int num_devices,
const char *buf);
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index 0c7ed30..c69cee6 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -15,10 +15,13 @@
#include <linux/ctype.h>
#include <linux/dcache.h>
+#include <asm/cio.h>
#include <asm/ccwdev.h>
#include <asm/ccwgroup.h>
-#define CCW_BUS_ID_SIZE 20
+#include "device.h"
+
+#define CCW_BUS_ID_SIZE 10
/* In Linux 2.4, we had a channel device layer called "chandev"
* that did all sorts of obscure stuff for networking devices.
@@ -254,9 +257,10 @@ static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
return 0;
}
-static int __get_next_bus_id(const char **buf, char *bus_id)
+static int __get_next_id(const char **buf, struct ccw_dev_id *id)
{
- int rc, len;
+ unsigned int cssid, ssid, devno;
+ int ret = 0, len;
char *start, *end;
start = (char *)*buf;
@@ -271,50 +275,42 @@ static int __get_next_bus_id(const char **buf, char *bus_id)
len = end - start + 1;
end++;
}
- if (len < CCW_BUS_ID_SIZE) {
- strlcpy(bus_id, start, len);
- rc = 0;
+ if (len <= CCW_BUS_ID_SIZE) {
+ if (sscanf(start, "%2x.%1x.%04x", &cssid, &ssid, &devno) != 3)
+ ret = -EINVAL;
} else
- rc = -EINVAL;
- *buf = end;
- return rc;
-}
-
-static int __is_valid_bus_id(char bus_id[CCW_BUS_ID_SIZE])
-{
- int cssid, ssid, devno;
+ ret = -EINVAL;
- /* Must be of form %x.%x.%04x */
- if (sscanf(bus_id, "%x.%1x.%04x", &cssid, &ssid, &devno) != 3)
- return 0;
- return 1;
+ if (!ret) {
+ id->ssid = ssid;
+ id->devno = devno;
+ }
+ *buf = end;
+ return ret;
}
/**
* ccwgroup_create_dev() - create and register a ccw group device
* @parent: parent device for the new device
* @creator_id: identifier of creating driver
- * @cdrv: ccw driver of slave devices
* @gdrv: driver for the new group device
* @num_devices: number of slave devices
* @buf: buffer containing comma separated bus ids of slave devices
*
* Create and register a new ccw group device as a child of @parent. Slave
- * devices are obtained from the list of bus ids given in @buf and must all
- * belong to @cdrv.
+ * devices are obtained from the list of bus ids given in @buf.
* Returns:
* %0 on success and an error code on failure.
* Context:
* non-atomic
*/
int ccwgroup_create_dev(struct device *parent, unsigned int creator_id,
- struct ccw_driver *cdrv, struct ccwgroup_driver *gdrv,
- int num_devices, const char *buf)
+ struct ccwgroup_driver *gdrv, int num_devices,
+ const char *buf)
{
struct ccwgroup_device *gdev;
+ struct ccw_dev_id dev_id;
int rc, i;
- char tmp_bus_id[CCW_BUS_ID_SIZE];
- const char *curr_buf;
gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]),
GFP_KERNEL);
@@ -334,22 +330,18 @@ int ccwgroup_create_dev(struct device *parent, unsigned int creator_id,
gdev->dev.release = ccwgroup_release;
device_initialize(&gdev->dev);
- curr_buf = buf;
- for (i = 0; i < num_devices && curr_buf; i++) {
- rc = __get_next_bus_id(&curr_buf, tmp_bus_id);
+ for (i = 0; i < num_devices && buf; i++) {
+ rc = __get_next_id(&buf, &dev_id);
if (rc != 0)
goto error;
- if (!__is_valid_bus_id(tmp_bus_id)) {
- rc = -EINVAL;
- goto error;
- }
- gdev->cdev[i] = get_ccwdev_by_busid(cdrv, tmp_bus_id);
+ gdev->cdev[i] = get_ccwdev_by_dev_id(&dev_id);
/*
* All devices have to be of the same type in
* order to be grouped.
*/
- if (!gdev->cdev[i]
- || gdev->cdev[i]->id.driver_info !=
+ if (!gdev->cdev[i] || !gdev->cdev[i]->drv ||
+ gdev->cdev[i]->drv != gdev->cdev[0]->drv ||
+ gdev->cdev[i]->id.driver_info !=
gdev->cdev[0]->id.driver_info) {
rc = -EINVAL;
goto error;
@@ -365,12 +357,12 @@ int ccwgroup_create_dev(struct device *parent, unsigned int creator_id,
spin_unlock_irq(gdev->cdev[i]->ccwlock);
}
/* Check for sufficient number of bus ids. */
- if (i < num_devices && !curr_buf) {
+ if (i < num_devices) {
rc = -EINVAL;
goto error;
}
/* Check for trailing stuff. */
- if (i == num_devices && strlen(curr_buf) > 0) {
+ if (i == num_devices && strlen(buf) > 0) {
rc = -EINVAL;
goto error;
}
@@ -430,8 +422,7 @@ int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
struct ccw_driver *cdrv, int num_devices,
const char *buf)
{
- return ccwgroup_create_dev(root, creator_id, cdrv, NULL,
- num_devices, buf);
+ return ccwgroup_create_dev(root, creator_id, NULL, num_devices, buf);
}
EXPORT_SYMBOL(ccwgroup_create_from_string);
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 02d0152..f8f952d 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -695,7 +695,17 @@ static int match_dev_id(struct device *dev, void *data)
return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
}
-static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
+/**
+ * get_ccwdev_by_dev_id() - obtain device from a ccw device id
+ * @dev_id: id of the device to be searched
+ *
+ * This function searches all devices attached to the ccw bus for a device
+ * matching @dev_id.
+ * Returns:
+ * If a device is found its reference count is increased and returned;
+ * else %NULL is returned.
+ */
+struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
{
struct device *dev;
@@ -703,6 +713,7 @@ static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
return dev ? to_ccwdev(dev) : NULL;
}
+EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id);
static void ccw_device_do_unbind_bind(struct ccw_device *cdev)
{
diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h
index 179824b..6bace69 100644
--- a/drivers/s390/cio/device.h
+++ b/drivers/s390/cio/device.h
@@ -101,6 +101,7 @@ int ccw_device_test_sense_data(struct ccw_device *);
void ccw_device_schedule_sch_unregister(struct ccw_device *);
int ccw_purge_blacklisted(void);
void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
+struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id);
/* Function prototypes for device status and basic sense stuff. */
void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
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