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authorSamuel Ortiz <sameo@linux.intel.com>2013-03-27 19:29:58 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-29 19:45:59 +0400
commit44d88d919261256e3bd999cde05572c8c4afb642 (patch)
tree95f1bc31837598f45fe5260b8f1be6ebf3f304ed /drivers/misc
parentcf3baefba04073237decb1b8a8c114b0b45bfc80 (diff)
downloadlinux-44d88d919261256e3bd999cde05572c8c4afb642.tar.xz
mei: bus: Synchronous API for the data transmission
Define a truly synchronous API for the bus Tx path by putting all pending request to the write list and wait for the interrupt tx handler to wake us up. The ___mei_cl_send() out path is also slightly reworked to make it look more like main.c:mei_write(). Signed-off-by: Samuel Ortiz <sameo@linux.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')
-rw-r--r--drivers/misc/mei/bus.c39
-rw-r--r--drivers/misc/mei/mei_dev.h1
2 files changed, 30 insertions, 10 deletions
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index c626dc9937eb..2b4b5b3f639f 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -222,7 +222,8 @@ void mei_cl_driver_unregister(struct mei_cl_driver *driver)
}
EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
-int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
+static int ___mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
+ bool blocking)
{
struct mei_device *dev;
struct mei_msg_hdr mei_hdr;
@@ -273,11 +274,8 @@ int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
cb->buf_idx = 0;
mei_hdr.msg_complete = 0;
cl->writing_state = MEI_WRITING;
- list_add_tail(&cb->list, &dev->write_list.list);
-
- mutex_unlock(&dev->device_lock);
- return length;
+ goto out;
}
dev->hbuf_is_ready = false;
@@ -303,19 +301,30 @@ int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
cl->writing_state = MEI_WRITING;
cb->buf_idx = mei_hdr.length;
- if (!mei_hdr.msg_complete) {
- list_add_tail(&cb->list, &dev->write_list.list);
- } else {
+out:
+ if (mei_hdr.msg_complete) {
if (mei_cl_flow_ctrl_reduce(cl)) {
- err = -EIO;
+ err = -ENODEV;
goto out_err;
}
-
list_add_tail(&cb->list, &dev->write_waiting_list.list);
+ } else {
+ list_add_tail(&cb->list, &dev->write_list.list);
}
mutex_unlock(&dev->device_lock);
+ if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
+ if (wait_event_interruptible(cl->tx_wait,
+ cl->writing_state == MEI_WRITE_COMPLETE)) {
+ if (signal_pending(current))
+ err = -EINTR;
+ err = -ERESTARTSYS;
+ mutex_lock(&dev->device_lock);
+ goto out_err;
+ }
+ }
+
return mei_hdr.length;
out_err:
@@ -382,6 +391,16 @@ out:
return r_length;
}
+inline int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length)
+{
+ return ___mei_cl_send(cl, buf, length, 0);
+}
+
+inline int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
+{
+ return ___mei_cl_send(cl, buf, length, 1);
+}
+
int mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length)
{
struct mei_cl *cl = device->cl;
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 7d594bedc685..325f71abeb7a 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -273,6 +273,7 @@ struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
uuid_le uuid, char *name);
void mei_cl_remove_device(struct mei_cl_device *device);
+int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length);
int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);