diff options
| author | Alexander Usyskin <alexander.usyskin@intel.com> | 2021-02-06 16:43:21 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-06 15:48:11 +0100 |
| commit | 36edb1407c3c042240b5dbc2530d6e7119535baa (patch) | |
| tree | 62820903eddf4b8cfedc8b86a5c1abf523a5a098 /drivers/misc/mei | |
| parent | 37f1cda4381f0e47ffb8365bc032ccc03bfc8b89 (diff) | |
| download | lwn-36edb1407c3c042240b5dbc2530d6e7119535baa.tar.gz lwn-36edb1407c3c042240b5dbc2530d6e7119535baa.zip | |
mei: allow clients on bus to communicate in remove callback
Introduce new intermediate state to allow the clients on the bus
to communicate with the firmware from the remove handler.
This is to enable to perform a clean shutdown.
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20210206144325.25682-2-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei')
| -rw-r--r-- | drivers/misc/mei/bus.c | 6 | ||||
| -rw-r--r-- | drivers/misc/mei/client.c | 3 | ||||
| -rw-r--r-- | drivers/misc/mei/init.c | 5 | ||||
| -rw-r--r-- | drivers/misc/mei/mei_dev.h | 1 |
4 files changed, 11 insertions, 4 deletions
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index 2907db260fba..34fb5e541fe5 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -44,7 +44,8 @@ ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, u8 vtag, bus = cl->dev; mutex_lock(&bus->device_lock); - if (bus->dev_state != MEI_DEV_ENABLED) { + if (bus->dev_state != MEI_DEV_ENABLED && + bus->dev_state != MEI_DEV_POWERING_DOWN) { rets = -ENODEV; goto out; } @@ -128,7 +129,8 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, u8 *vtag, bus = cl->dev; mutex_lock(&bus->device_lock); - if (bus->dev_state != MEI_DEV_ENABLED) { + if (bus->dev_state != MEI_DEV_ENABLED && + bus->dev_state != MEI_DEV_POWERING_DOWN) { rets = -ENODEV; goto out; } diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c index beb6cdff20fb..d3f060dce4a6 100644 --- a/drivers/misc/mei/client.c +++ b/drivers/misc/mei/client.c @@ -990,7 +990,8 @@ int mei_cl_disconnect(struct mei_cl *cl) return 0; } - if (dev->dev_state == MEI_DEV_POWER_DOWN) { + if (dev->dev_state == MEI_DEV_POWERING_DOWN || + dev->dev_state == MEI_DEV_POWER_DOWN) { cl_dbg(dev, cl, "Device is powering down, don't bother with disconnection\n"); mei_cl_set_disconnected(cl); return 0; diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c index bcee77768b91..5c8cb679b997 100644 --- a/drivers/misc/mei/init.c +++ b/drivers/misc/mei/init.c @@ -303,9 +303,12 @@ void mei_stop(struct mei_device *dev) dev_dbg(dev->dev, "stopping the device.\n"); mutex_lock(&dev->device_lock); - mei_set_devstate(dev, MEI_DEV_POWER_DOWN); + mei_set_devstate(dev, MEI_DEV_POWERING_DOWN); mutex_unlock(&dev->device_lock); mei_cl_bus_remove_devices(dev); + mutex_lock(&dev->device_lock); + mei_set_devstate(dev, MEI_DEV_POWER_DOWN); + mutex_unlock(&dev->device_lock); mei_cancel_work(dev); diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h index 8c395bfdf6f3..585a6f615bf8 100644 --- a/drivers/misc/mei/mei_dev.h +++ b/drivers/misc/mei/mei_dev.h @@ -57,6 +57,7 @@ enum mei_dev_state { MEI_DEV_ENABLED, MEI_DEV_RESETTING, MEI_DEV_DISABLED, + MEI_DEV_POWERING_DOWN, MEI_DEV_POWER_DOWN, MEI_DEV_POWER_UP }; |