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mei: bus: prevent hardware module unload if device on bus is active

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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>
This commit is contained in:
Alexander Usyskin
2017-01-27 16:32:39 +02:00
committed by Greg Kroah-Hartman
parent 9ecb839f16
commit 5d88246090
3 changed files with 41 additions and 2 deletions
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10
drivers/misc/mei/client.c
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@@ -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);