linux-kernel - [QUEUED v20180920 07/16] stm class: Switch over to the protocol driver

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Date:   Thu, 20 Sep 2018 15:45:44 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [QUEUED v20180920 07/16] stm class: Switch over to the protocol driver

Now that the default framing protocol is factored out into its own driver,
switch over to using the driver for writing data.

Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 drivers/hwtracing/stm/core.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index 9ed2f06deb47..fb224574b3db 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -598,17 +598,21 @@ ssize_t notrace stm_data_write(struct stm_data *data, unsigned int m,
 }
 EXPORT_SYMBOL_GPL(stm_data_write);
 
-static ssize_t notrace stm_write(struct stm_data *data, unsigned int master,
-			  unsigned int channel, const char *buf, size_t count)
+static ssize_t notrace
+stm_write(struct stm_device *stm, struct stm_output *output,
+	  unsigned int chan, const char *buf, size_t count)
 {
-	ssize_t sz;
+	int err;
+
+	/* stm->pdrv is serialized against policy_mutex */
+	if (!stm->pdrv)
+		return -ENODEV;
 
-	sz = stm_data_write(data, master, channel, true, buf, count);
-	if (sz > 0)
-		data->packet(data, master, channel, STP_PACKET_FLAG, 0, 0,
-			     buf);
+	err = stm->pdrv->write(stm->data, output, chan, buf, count);
+	if (err < 0)
+		return err;
 
-	return sz;
+	return err;
 }
 
 static ssize_t stm_char_write(struct file *file, const char __user *buf,
@@ -655,8 +659,7 @@ static ssize_t stm_char_write(struct file *file, const char __user *buf,
 
 	pm_runtime_get_sync(&stm->dev);
 
-	count = stm_write(stm->data, stmf->output.master, stmf->output.channel,
-			  kbuf, count);
+	count = stm_write(stm, &stmf->output, 0, kbuf, count);
 
 	pm_runtime_mark_last_busy(&stm->dev);
 	pm_runtime_put_autosuspend(&stm->dev);
@@ -1306,9 +1309,7 @@ int notrace stm_source_write(struct stm_source_data *data,
 
 	stm = srcu_dereference(src->link, &stm_source_srcu);
 	if (stm)
-		count = stm_write(stm->data, src->output.master,
-				  src->output.channel + chan,
-				  buf, count);
+		count = stm_write(stm, &src->output, chan, buf, count);
 	else
 		count = -ENODEV;
 
-- 
2.18.0