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mei: add mei_hbuf_acquire wrapper

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A client has to acquire host buffer
before writing, we add lock like wrapper
to replace the code snippet

if (dev->hbuf_is_ready)
        dev->hbuf_is_ready = false;

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler
2014-02-19 17:35:47 +02:00
committed by Greg Kroah-Hartman
parent 4a22176aa8
commit 6aae48ff18
7 changed files with 57 additions and 47 deletions
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7
drivers/misc/mei/amthif.c
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@@ -296,9 +296,8 @@ static int mei_amthif_send_cmd(struct mei_device *dev, struct mei_cl_cb *cb)
if (ret < 0)
return ret;
if (ret && dev->hbuf_is_ready) {
if (ret && mei_hbuf_acquire(dev)) {
ret = 0;
dev->hbuf_is_ready = false;
if (cb->request_buffer.size > mei_hbuf_max_len(dev)) {
mei_hdr.length = mei_hbuf_max_len(dev);
mei_hdr.msg_complete = 0;
@@ -330,10 +329,6 @@ static int mei_amthif_send_cmd(struct mei_device *dev, struct mei_cl_cb *cb)
list_add_tail(&cb->list, &dev->write_list.list);
}
} else {
if (!dev->hbuf_is_ready)
dev_dbg(&dev->pdev->dev, "host buffer is not empty");
dev_dbg(&dev->pdev->dev, "No flow control credentials, so add iamthif cb to write list.\n");
list_add_tail(&cb->list, &dev->write_list.list);
}
return 0;