diff options
author | Alexander Usyskin <alexander.usyskin@intel.com> | 2017-01-27 17:32:39 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-31 13:07:43 +0300 |
commit | 5d88246090c5e9b178eb05bcfb52bbaad2ae48f3 (patch) | |
tree | 35fba5dcc29e9a348d925ab900e2b69ee1346f69 /drivers/misc/mei/bus.c | |
parent | 9ecb839f16a353e71175981a098842fda4ddc7f1 (diff) | |
download | linux-5d88246090c5e9b178eb05bcfb52bbaad2ae48f3.tar.xz |
mei: bus: prevent hardware module unload if device on bus is active
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 <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei/bus.c')
-rw-r--r-- | drivers/misc/mei/bus.c | 31 |
1 files changed, 31 insertions, 0 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 @@ out: 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 |