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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2009-10-12 20:17:41 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2009-10-30 14:59:51 -0700
commit1a6f2a7512021ceae3c4201c7aab07f032e9ce91 (patch)
tree03fdca9848003b3a6fda57113b3e750ec1e22a55
parent39acbc12affcaa23ef1d887ba3d197baca8e6e47 (diff)
Driver core: allow certain drivers prohibit bind/unbind via sysfs
Platform drivers registered via platform_driver_probe() can be bound to devices only once, upon registration, because discard their probe() routines to save memory. Unbinding the driver through sysfs 'unbind' leaves the device stranded and confuses users so let's not create bind and unbind attributes for such drivers. Signed-off-by: Dmitry Torokhov <dtor@mail.ru> Cc: Éric Piel <eric.piel@tremplin-utc.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/base/bus.c17
-rw-r--r--drivers/base/platform.c6
-rw-r--r--include/linux/device.h4
3 files changed, 19 insertions, 8 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 973bf2ad4e0..63c143e54a5 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -689,15 +689,19 @@ int bus_add_driver(struct device_driver *drv)
printk(KERN_ERR "%s: driver_add_attrs(%s) failed\n",
__func__, drv->name);
}
- error = add_bind_files(drv);
- if (error) {
- /* Ditto */
- printk(KERN_ERR "%s: add_bind_files(%s) failed\n",
- __func__, drv->name);
+
+ if (!drv->suppress_bind_attrs) {
+ error = add_bind_files(drv);
+ if (error) {
+ /* Ditto */
+ printk(KERN_ERR "%s: add_bind_files(%s) failed\n",
+ __func__, drv->name);
+ }
}
kobject_uevent(&priv->kobj, KOBJ_ADD);
return 0;
+
out_unregister:
kfree(drv->p);
drv->p = NULL;
@@ -720,7 +724,8 @@ void bus_remove_driver(struct device_driver *drv)
if (!drv->bus)
return;
- remove_bind_files(drv);
+ if (!drv->suppress_bind_attrs)
+ remove_bind_files(drv);
driver_remove_attrs(drv->bus, drv);
driver_remove_file(drv, &driver_attr_uevent);
klist_remove(&drv->p->knode_bus);
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index ed156a13aa4..4fa954b07ac 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -521,11 +521,15 @@ int __init_or_module platform_driver_probe(struct platform_driver *drv,
{
int retval, code;
+ /* make sure driver won't have bind/unbind attributes */
+ drv->driver.suppress_bind_attrs = true;
+
/* temporary section violation during probe() */
drv->probe = probe;
retval = code = platform_driver_register(drv);
- /* Fixup that section violation, being paranoid about code scanning
+ /*
+ * Fixup that section violation, being paranoid about code scanning
* the list of drivers in order to probe new devices. Check to see
* if the probe was successful, and make sure any forced probes of
* new devices fail.
diff --git a/include/linux/device.h b/include/linux/device.h
index aca31bf7d8e..2ea3e492181 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -124,7 +124,9 @@ struct device_driver {
struct bus_type *bus;
struct module *owner;
- const char *mod_name; /* used for built-in modules */
+ const char *mod_name; /* used for built-in modules */
+
+ bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
int (*probe) (struct device *dev);
int (*remove) (struct device *dev);