diff options
| author | Alexander Usyskin <alexander.usyskin@intel.com> | 2015-05-04 09:43:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-24 21:13:48 +0300 |
| commit | a03d77f6ed7dc74d6244e4d8681ba669d7c414aa (patch) | |
| tree | 2f4bebc9c73a30b16017bda5cd532aec4ada2ef3 /drivers/misc/mei/client.c | |
| parent | d49ed64a6e3f73975b7eb570c4ea8f37e87d7e5d (diff) | |
| download | linux-a03d77f6ed7dc74d6244e4d8681ba669d7c414aa.tar.xz | |
mei: fix flow control for single buffer clients
For ME clients that use single receiving buffer
the driver tracks credentials on mei_me_clients structure
for all connections. The driver needs to book keep the shared
resource correctly and track the connections, particularly
the credit has to be cleaned when there is no active connection
to a particular me client. This solves issue when subsequent
connection will not get an ill impression that it can write.
We add active connection counter the particular ME client and
when the counter reach zero, we clear the credits.
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/client.c')
| -rw-r--r-- | drivers/misc/mei/client.c | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c index aa1d35a51e9f..98335b435b75 100644 --- a/drivers/misc/mei/client.c +++ b/drivers/misc/mei/client.c @@ -749,10 +749,31 @@ void mei_cl_set_disconnected(struct mei_cl *cl) cl->mei_flow_ctrl_creds = 0; cl->timer_count = 0; + if (!cl->me_cl) + return; + + if (!WARN_ON(cl->me_cl->connect_count == 0)) + cl->me_cl->connect_count--; + + if (cl->me_cl->connect_count == 0) + cl->me_cl->mei_flow_ctrl_creds = 0; + mei_me_cl_put(cl->me_cl); cl->me_cl = NULL; } +static int mei_cl_set_connecting(struct mei_cl *cl, struct mei_me_client *me_cl) +{ + cl->me_cl = mei_me_cl_get(me_cl); + if (!cl->me_cl) + return -ENOENT; + + cl->state = MEI_FILE_CONNECTING; + cl->me_cl->connect_count++; + + return 0; +} + /* * mei_cl_send_disconnect - send disconnect request * @@ -1009,13 +1030,9 @@ int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl, if (rets) goto out; - cl->me_cl = mei_me_cl_get(me_cl); - if (!cl->me_cl) { - rets = -ENODEV; + rets = mei_cl_set_connecting(cl, me_cl); + if (rets) goto out; - } - - cl->state = MEI_FILE_CONNECTING; list_add_tail(&cb->list, &dev->ctrl_wr_list.list); /* run hbuf acquire last so we don't have to undo */ |