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s390/ccwgroup: exploit ccwdev_by_dev_id 

Instead of finding devices via driver_find_device use the bus_find_device
wrapper get_ccwdev_by_dev_id. This allows us to get rid of the ccw_driver
argument of ccwgroup_create_dev and thus simplify the interface.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2012-05-15 17:52:07 +02:00 committed by Martin Schwidefsky
parent f2962dae0e
commit b7a610f7b4
4 changed files with 45 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/s390/include/asm/ccwgroup.h
View File

@ -66,8 +66,8 @@ struct ccwgroup_driver {
extern int ccwgroup_driver_register (struct ccwgroup_driver *cdriver); extern int ccwgroup_driver_register (struct ccwgroup_driver *cdriver);
extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver); extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);
int ccwgroup_create_dev(struct device *root, unsigned int creator_id, int ccwgroup_create_dev(struct device *root, unsigned int creator_id,
struct ccw_driver *cdrv, struct ccwgroup_driver *gdrv, struct ccwgroup_driver *gdrv, int num_devices,
int num_devices, const char *buf); const char *buf);
int ccwgroup_create_from_string(struct device *root, unsigned int creator_id, int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
struct ccw_driver *cdrv, int num_devices, struct ccw_driver *cdrv, int num_devices,
const char *buf); const char *buf);

69
drivers/s390/cio/ccwgroup.c
View File

@ -15,10 +15,13 @@
#include <linux/ctype.h> #include <linux/ctype.h>
#include <linux/dcache.h> #include <linux/dcache.h>
#include <asm/cio.h>
#include <asm/ccwdev.h> #include <asm/ccwdev.h>
#include <asm/ccwgroup.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" /* In Linux 2.4, we had a channel device layer called "chandev"
* that did all sorts of obscure stuff for networking devices. * 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; 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; char *start, *end;
start = (char *)*buf; start = (char *)*buf;
@ -271,50 +275,42 @@ static int __get_next_bus_id(const char **buf, char *bus_id)
len = end - start + 1; len = end - start + 1;
end++; end++;
} }
if (len < CCW_BUS_ID_SIZE) { if (len <= CCW_BUS_ID_SIZE) {
strlcpy(bus_id, start, len); if (sscanf(start, "%2x.%1x.%04x", &cssid, &ssid, &devno) != 3)
rc = 0; ret = -EINVAL;
} else } else
rc = -EINVAL; ret = -EINVAL;
if (!ret) {
id->ssid = ssid;
id->devno = devno;
}
*buf = end; *buf = end;
return rc; return ret;
}
static int __is_valid_bus_id(char bus_id[CCW_BUS_ID_SIZE])
{
int cssid, ssid, devno;
/* Must be of form %x.%x.%04x */
if (sscanf(bus_id, "%x.%1x.%04x", &cssid, &ssid, &devno) != 3)
return 0;
return 1;
} }
/** /**
* ccwgroup_create_dev() - create and register a ccw group device * ccwgroup_create_dev() - create and register a ccw group device
* @parent: parent device for the new device * @parent: parent device for the new device
* @creator_id: identifier of creating driver * @creator_id: identifier of creating driver
* @cdrv: ccw driver of slave devices
* @gdrv: driver for the new group device * @gdrv: driver for the new group device
* @num_devices: number of slave devices * @num_devices: number of slave devices
* @buf: buffer containing comma separated bus ids 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 * 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 * devices are obtained from the list of bus ids given in @buf.
* belong to @cdrv.
* Returns: * Returns:
* %0 on success and an error code on failure. * %0 on success and an error code on failure.
* Context: * Context:
* non-atomic * non-atomic
*/ */
int ccwgroup_create_dev(struct device *parent, unsigned int creator_id, int ccwgroup_create_dev(struct device *parent, unsigned int creator_id,
struct ccw_driver *cdrv, struct ccwgroup_driver *gdrv, struct ccwgroup_driver *gdrv, int num_devices,
int num_devices, const char *buf) const char *buf)
{ {
struct ccwgroup_device *gdev; struct ccwgroup_device *gdev;
struct ccw_dev_id dev_id;
int rc, i; 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]), gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]),
GFP_KERNEL); GFP_KERNEL);
@ -334,22 +330,18 @@ int ccwgroup_create_dev(struct device *parent, unsigned int creator_id,
gdev->dev.release = ccwgroup_release; gdev->dev.release = ccwgroup_release;
device_initialize(&gdev->dev); device_initialize(&gdev->dev);
curr_buf = buf; for (i = 0; i < num_devices && buf; i++) {
for (i = 0; i < num_devices && curr_buf; i++) { rc = __get_next_id(&buf, &dev_id);
rc = __get_next_bus_id(&curr_buf, tmp_bus_id);
if (rc != 0) if (rc != 0)
goto error; goto error;
if (!__is_valid_bus_id(tmp_bus_id)) { gdev->cdev[i] = get_ccwdev_by_dev_id(&dev_id);
rc = -EINVAL;
goto error;
}
gdev->cdev[i] = get_ccwdev_by_busid(cdrv, tmp_bus_id);
/* /*
* All devices have to be of the same type in * All devices have to be of the same type in
* order to be grouped. * order to be grouped.
*/ */
if (!gdev->cdev[i] if (!gdev->cdev[i] || !gdev->cdev[i]->drv ||
|| gdev->cdev[i]->id.driver_info != gdev->cdev[i]->drv != gdev->cdev[0]->drv ||
gdev->cdev[i]->id.driver_info !=
gdev->cdev[0]->id.driver_info) { gdev->cdev[0]->id.driver_info) {
rc = -EINVAL; rc = -EINVAL;
goto error; goto error;
@ -365,12 +357,12 @@ int ccwgroup_create_dev(struct device *parent, unsigned int creator_id,
spin_unlock_irq(gdev->cdev[i]->ccwlock); spin_unlock_irq(gdev->cdev[i]->ccwlock);
} }
/* Check for sufficient number of bus ids. */ /* Check for sufficient number of bus ids. */
if (i < num_devices && !curr_buf) { if (i < num_devices) {
rc = -EINVAL; rc = -EINVAL;
goto error; goto error;
} }
/* Check for trailing stuff. */ /* Check for trailing stuff. */
if (i == num_devices && strlen(curr_buf) > 0) { if (i == num_devices && strlen(buf) > 0) {
rc = -EINVAL; rc = -EINVAL;
goto error; 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, struct ccw_driver *cdrv, int num_devices,
const char *buf) const char *buf)
{ {
return ccwgroup_create_dev(root, creator_id, cdrv, NULL, return ccwgroup_create_dev(root, creator_id, NULL, num_devices, buf);
num_devices, buf);
} }
EXPORT_SYMBOL(ccwgroup_create_from_string); EXPORT_SYMBOL(ccwgroup_create_from_string);

13
drivers/s390/cio/device.c
View File

@ -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); 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; 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; 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) static void ccw_device_do_unbind_bind(struct ccw_device *cdev)
{ {

1
drivers/s390/cio/device.h
View File

@ -101,6 +101,7 @@ int ccw_device_test_sense_data(struct ccw_device *);
void ccw_device_schedule_sch_unregister(struct ccw_device *); void ccw_device_schedule_sch_unregister(struct ccw_device *);
int ccw_purge_blacklisted(void); int ccw_purge_blacklisted(void);
void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo); 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. */ /* Function prototypes for device status and basic sense stuff. */
void ccw_device_accumulate_irb(struct ccw_device *, struct irb *); void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);