From: Alexander Usyskin <[email protected]> The hardware module should not be unloaded if the bus has active devices. Get get_/put_ bus parent module upon client device connection/disconnection, to prevent the hardware managing module to disappear underneath.
Signed-off-by: Alexander Usyskin <[email protected]> Signed-off-by: Tomas Winkler <[email protected]> --- drivers/misc/mei/bus.c | 31 +++++++++++++++++++++++++++++++ drivers/misc/mei/client.c | 10 ++++++++-- drivers/misc/mei/mei_dev.h | 2 ++ 3 files changed, 41 insertions(+), 2 deletions(-) diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index 3bb1f1500f6b..b67f15b53067 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -542,6 +542,37 @@ int mei_cldev_disable(struct mei_cl_device *cldev) EXPORT_SYMBOL_GPL(mei_cldev_disable); /** + * mei_cl_bus_module_get - acquire module of the underlying + * hw module. + * + * @cl: host client + * + * Return: true on success; false if the module was removed. + */ +bool mei_cl_bus_module_get(struct mei_cl *cl) +{ + struct mei_cl_device *cldev = cl->cldev; + + if (!cldev) + return true; + + return try_module_get(cldev->bus->dev->driver->owner); +} + +/** + * mei_cl_bus_module_put - release the underlying hw module. + * + * @cl: host client + */ +void mei_cl_bus_module_put(struct mei_cl *cl) +{ + struct mei_cl_device *cldev = cl->cldev; + + if (cldev) + module_put(cldev->bus->dev->driver->owner); +} + +/** * mei_cl_device_find - find matching entry in the driver id table * * @cldev: me client device diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c index da1c0703910a..619b4702347f 100644 --- a/drivers/misc/mei/client.c +++ b/drivers/misc/mei/client.c @@ -774,6 +774,8 @@ static void mei_cl_set_disconnected(struct mei_cl *cl) cl->tx_flow_ctrl_creds = 0; cl->timer_count = 0; + mei_cl_bus_module_put(cl); + if (!cl->me_cl) return; @@ -1077,13 +1079,17 @@ int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl, dev = cl->dev; + if (!mei_cl_bus_module_get(cl)) + return -ENODEV; + rets = mei_cl_set_connecting(cl, me_cl); if (rets) - return rets; + goto nortpm; if (mei_cl_is_fixed_address(cl)) { cl->state = MEI_FILE_CONNECTED; - return 0; + rets = 0; + goto nortpm; } rets = pm_runtime_get(dev->dev); diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h index 8dadb98662a9..33ff4b7e356d 100644 --- a/drivers/misc/mei/mei_dev.h +++ b/drivers/misc/mei/mei_dev.h @@ -328,6 +328,8 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, bool mei_cl_bus_rx_event(struct mei_cl *cl); bool mei_cl_bus_notify_event(struct mei_cl *cl); void mei_cl_bus_remove_devices(struct mei_device *bus); +bool mei_cl_bus_module_get(struct mei_cl *cl); +void mei_cl_bus_module_put(struct mei_cl *cl); int mei_cl_bus_init(void); void mei_cl_bus_exit(void); -- 2.7.4
