From: Ursula Braun <braunu@xxxxxxxxxx>
Instead of having each driver for ccwgroup slave device parsing the
input itself and calling ccwgroup_create(), introduce a new function
ccwgroup_create_from_string() and handle parsing inside the ccwgroup
core.
Signed-off-by: Ursula Braun <braunu@xxxxxxxxxx>
Signed-off-by: Frank Blaschka <frank.blaschka@xxxxxxxxxx>
---
drivers/s390/cio/ccwgroup.c | 96 +++++++++++++++++++++++++++++---------
drivers/s390/net/cu3088.c | 20 -------
drivers/s390/net/qeth_core_main.c | 23 ---------
include/asm-s390/ccwgroup.h | 7 +-
4 files changed, 82 insertions(+), 64 deletions(-)
Index: git_linus/drivers/s390/cio/ccwgroup.c
===================================================================
--- git_linus.orig/drivers/s390/cio/ccwgroup.c 2008-04-24 09:04:43.000000000 +0200
+++ git_linus/drivers/s390/cio/ccwgroup.c 2008-04-24 09:05:08.000000000 +0200
@@ -152,44 +152,89 @@
return 0;
}
+static int __get_next_bus_id(const char **buf, char *bus_id)
+{
+ int rc, len;
+ char *start, *end;
+
+ start = (char *)*buf;
+ end = strchr(start, ',');
+ if (!end) {
+ /* Last entry. Strip trailing newline, if applicable. */
+ end = strchr(start, '\n');
+ if (end)
+ *end = '\0';
+ len = strlen(start) + 1;
+ } else {
+ len = end - start + 1;
+ end++;
+ }
+ if (len < BUS_ID_SIZE) {
+ strlcpy(bus_id, start, len);
+ rc = 0;
+ } else
+ rc = -EINVAL;
+ *buf = end;
+ return rc;
+}
+
+static int __is_valid_bus_id(char bus_id[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() - create and register a ccw group device
+ * ccwgroup_create_from_string() - create and register a ccw group device
* @root: parent device for the new device
* @creator_id: identifier of creating driver
* @cdrv: ccw driver of slave devices
- * @argc: number of slave devices
- * @argv: bus ids of slave devices
+ * @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 @root. Slave
- * devices are obtained from the list of bus ids given in @argv[] and must all
+ * devices are obtained from the list of bus ids given in @buf and must all
* belong to @cdrv.
* Returns:
* %0 on success and an error code on failure.
* Context:
* non-atomic
*/
-int ccwgroup_create(struct device *root, unsigned int creator_id,
- struct ccw_driver *cdrv, int argc, char *argv[])
+int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
+ struct ccw_driver *cdrv, int num_devices,
+ const char *buf)
{
struct ccwgroup_device *gdev;
- int i;
- int rc;
+ int rc, i;
+ char tmp_bus_id[BUS_ID_SIZE];
+ const char *curr_buf;
- if (argc > 256) /* disallow dumb users */
- return -EINVAL;
-
- gdev = kzalloc(sizeof(*gdev) + argc*sizeof(gdev->cdev[0]), GFP_KERNEL);
+ gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]),
+ GFP_KERNEL);
if (!gdev)
return -ENOMEM;
atomic_set(&gdev->onoff, 0);
mutex_init(&gdev->reg_mutex);
mutex_lock(&gdev->reg_mutex);
- for (i = 0; i < argc; i++) {
- gdev->cdev[i] = get_ccwdev_by_busid(cdrv, argv[i]);
-
- /* all devices have to be of the same type in
- * order to be grouped */
+ curr_buf = buf;
+ for (i = 0; i < num_devices && curr_buf; i++) {
+ rc = __get_next_bus_id(&curr_buf, tmp_bus_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);
+ /*
+ * All devices have to be of the same type in
+ * order to be grouped.
+ */
if (!gdev->cdev[i]
|| gdev->cdev[i]->id.driver_info !=
gdev->cdev[0]->id.driver_info) {
@@ -203,9 +248,18 @@
}
dev_set_drvdata(&gdev->cdev[i]->dev, gdev);
}
-
+ /* Check for sufficient number of bus ids. */
+ if (i < num_devices && !curr_buf) {
+ rc = -EINVAL;
+ goto error;
+ }
+ /* Check for trailing stuff. */
+ if (i == num_devices && strlen(curr_buf) > 0) {
+ rc = -EINVAL;
+ goto error;
+ }
gdev->creator_id = creator_id;
- gdev->count = argc;
+ gdev->count = num_devices;
gdev->dev.bus = &ccwgroup_bus_type;
gdev->dev.parent = root;
gdev->dev.release = ccwgroup_release;
@@ -233,7 +287,7 @@
device_remove_file(&gdev->dev, &dev_attr_ungroup);
device_unregister(&gdev->dev);
error:
- for (i = 0; i < argc; i++)
+ for (i = 0; i < num_devices; i++)
if (gdev->cdev[i]) {
if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev)
dev_set_drvdata(&gdev->cdev[i]->dev, NULL);
@@ -243,6 +297,7 @@
put_device(&gdev->dev);
return rc;
}
+EXPORT_SYMBOL(ccwgroup_create_from_string);
static int __init
init_ccwgroup (void)
@@ -518,6 +573,5 @@
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(ccwgroup_driver_register);
EXPORT_SYMBOL(ccwgroup_driver_unregister);
-EXPORT_SYMBOL(ccwgroup_create);
EXPORT_SYMBOL(ccwgroup_probe_ccwdev);
EXPORT_SYMBOL(ccwgroup_remove_ccwdev);
Index: git_linus/drivers/s390/net/cu3088.c
===================================================================
--- git_linus.orig/drivers/s390/net/cu3088.c 2008-04-24 09:04:43.000000000 +0200
+++ git_linus/drivers/s390/net/cu3088.c 2008-04-24 09:05:08.000000000 +0200
@@ -62,30 +62,14 @@
static ssize_t
group_write(struct device_driver *drv, const char *buf, size_t count)
{
- const char *start, *end;
- char bus_ids[2][BUS_ID_SIZE], *argv[2];
- int i;
int ret;
struct ccwgroup_driver *cdrv;
cdrv = to_ccwgroupdrv(drv);
if (!cdrv)
return -EINVAL;
- start = buf;
- for (i=0; i<2; i++) {
- static const char delim[] = {',', '\n'};
- int len;
-
- if (!(end = strchr(start, delim[i])))
- return -EINVAL;
- len = min_t(ptrdiff_t, BUS_ID_SIZE, end - start + 1);
- strlcpy (bus_ids[i], start, len);
- argv[i] = bus_ids[i];
- start = end + 1;
- }
-
- ret = ccwgroup_create(cu3088_root_dev, cdrv->driver_id,
- &cu3088_driver, 2, argv);
+ ret = ccwgroup_create_from_string(cu3088_root_dev, cdrv->driver_id,
+ &cu3088_driver, 2, buf);
return (ret == 0) ? count : ret;
}
Index: git_linus/drivers/s390/net/qeth_core_main.c
===================================================================
--- git_linus.orig/drivers/s390/net/qeth_core_main.c 2008-04-24 09:04:43.000000000 +0200
+++ git_linus/drivers/s390/net/qeth_core_main.c 2008-04-24 09:05:08.000000000 +0200
@@ -3827,27 +3827,8 @@
static int qeth_core_driver_group(const char *buf, struct device *root_dev,
unsigned long driver_id)
{
- const char *start, *end;
- char bus_ids[3][BUS_ID_SIZE], *argv[3];
- int i;
-
- start = buf;
- for (i = 0; i < 3; i++) {
- static const char delim[] = { ',', ',', '\n' };
- int len;
-
- end = strchr(start, delim[i]);
- if (!end)
- return -EINVAL;
- len = min_t(ptrdiff_t, BUS_ID_SIZE, end - start);
- strncpy(bus_ids[i], start, len);
- bus_ids[i][len] = '\0';
- start = end + 1;
- argv[i] = bus_ids[i];
- }
-
- return (ccwgroup_create(root_dev, driver_id,
- &qeth_ccw_driver, 3, argv));
+ return ccwgroup_create_from_string(root_dev, driver_id,
+ &qeth_ccw_driver, 3, buf);
}
int qeth_core_hardsetup_card(struct qeth_card *card)
Index: git_linus/include/asm-s390/ccwgroup.h
===================================================================
--- git_linus.orig/include/asm-s390/ccwgroup.h 2008-04-24 09:04:43.000000000 +0200
+++ git_linus/include/asm-s390/ccwgroup.h 2008-04-24 09:05:08.000000000 +0200
@@ -57,10 +57,9 @@
extern int ccwgroup_driver_register (struct ccwgroup_driver *cdriver);
extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);
-extern int ccwgroup_create (struct device *root,
- unsigned int creator_id,
- struct ccw_driver *gdrv,
- int argc, char *argv[]);
+int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
+ struct ccw_driver *cdrv, int num_devices,
+ const char *buf);
extern int ccwgroup_probe_ccwdev(struct ccw_device *cdev);
extern void ccwgroup_remove_ccwdev(struct ccw_device *cdev);
--
--
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