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device-dax: Auto-bind device after successful new_id

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The typical 'new_id' attribute behavior is to immediately attach a
device to its driver after a new device-id is added. Implement this
behavior for the dax bus.

Reported-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Reported-by: Brice Goglin <Brice.Goglin@inria.fr>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2019-01-24 13:12:04 -08:00
parent 8fc5c73554
commit 664525b2d8
1 changed files with 18 additions and 6 deletions
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22
drivers/dax/bus.c
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@ -57,8 +57,13 @@ static int dax_match_id(struct dax_device_driver *dax_drv, struct device *dev)
return match;
}
enum id_action {
ID_REMOVE,
ID_ADD,
};
static ssize_t do_id_store(struct device_driver *drv, const char *buf,
size_t count, bool add)
size_t count, enum id_action action)
{
struct dax_device_driver *dax_drv = to_dax_drv(drv);
unsigned int region_id, id;
@ -77,7 +82,7 @@ static ssize_t do_id_store(struct device_driver *drv, const char *buf,
mutex_lock(&dax_bus_lock);
dax_id = __dax_match_id(dax_drv, buf);
if (!dax_id) {
if (add) {
if (action == ID_ADD) {
dax_id = kzalloc(sizeof(*dax_id), GFP_KERNEL);
if (dax_id) {
strncpy(dax_id->dev_name, buf, DAX_NAME_LEN);
@ -86,26 +91,33 @@ static ssize_t do_id_store(struct device_driver *drv, const char *buf,
rc = -ENOMEM;
} else
/* nothing to remove */;
} else if (!add) {
} else if (action == ID_REMOVE) {
list_del(&dax_id->list);
kfree(dax_id);
} else
/* dax_id already added */;
mutex_unlock(&dax_bus_lock);
if (rc < 0)
return rc;
if (action == ID_ADD)
rc = driver_attach(drv);
if (rc)
return rc;
return count;
}
static ssize_t new_id_store(struct device_driver *drv, const char *buf,
size_t count)
{
return do_id_store(drv, buf, count, true);
return do_id_store(drv, buf, count, ID_ADD);
}
static DRIVER_ATTR_WO(new_id);
static ssize_t remove_id_store(struct device_driver *drv, const char *buf,
size_t count)
{
return do_id_store(drv, buf, count, false);
return do_id_store(drv, buf, count, ID_REMOVE);
}
static DRIVER_ATTR_WO(remove_id);