From feb8cd0fe7d63fd259c28f8a52fc88745717c9ec Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Thu, 23 Jul 2015 15:08:40 +0300 Subject: [PATCH] mei: bus: revamp probe and remove functions Instead of generating device id on the fly during probing we find the matching id entry on the device id table. Get bus the module reference counter so it cannot be unloaded after the driver has bounded to the client device Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mei/bus.c | 41 ++++++++++++++++++++++++++++++----------- 1 file changed, 30 insertions(+), 11 deletions(-) diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index 4955a09..1d9ce9c4 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -446,30 +446,49 @@ static int mei_cl_device_match(struct device *dev, struct device_driver *drv) return 0; } +/** + * mei_cl_device_probe - bus probe function + * + * @dev: device + * + * Return: 0 on success; < 0 otherwise + */ static int mei_cl_device_probe(struct device *dev) { - struct mei_cl_device *cldev = to_mei_cl_device(dev); + struct mei_cl_device *cldev; struct mei_cl_driver *cldrv; - struct mei_cl_device_id id; + const struct mei_cl_device_id *id; + + cldev = to_mei_cl_device(dev); + cldrv = to_mei_cl_driver(dev->driver); if (!cldev) return 0; - cldrv = to_mei_cl_driver(dev->driver); if (!cldrv || !cldrv->probe) return -ENODEV; - dev_dbg(dev, "Device probe\n"); + id = mei_cl_device_find(cldev, cldrv); + if (!id) + return -ENODEV; - strlcpy(id.name, cldev->name, sizeof(id.name)); + __module_get(THIS_MODULE); - return cldrv->probe(cldev, &id); + return cldrv->probe(cldev, id); } +/** + * mei_cl_device_remove - remove device from the bus + * + * @dev: device + * + * Return: 0 on success; < 0 otherwise + */ static int mei_cl_device_remove(struct device *dev) { struct mei_cl_device *cldev = to_mei_cl_device(dev); struct mei_cl_driver *cldrv; + int ret = 0; if (!cldev || !dev->driver) return 0; @@ -480,13 +499,13 @@ static int mei_cl_device_remove(struct device *dev) } cldrv = to_mei_cl_driver(dev->driver); - if (!cldrv->remove) { - dev->driver = NULL; + if (cldrv->remove) + ret = cldrv->remove(cldev); - return 0; - } + module_put(THIS_MODULE); + dev->driver = NULL; + return ret; - return cldrv->remove(cldev); } static ssize_t name_show(struct device *dev, struct device_attribute *a, -- 2.7.4