[PATCH] drm/imagination: simplify pvr_fw_trace_seq_data

[Rosen Penev <rosenp@gmail.com>]

A flexible array member allows one allocation instead of two. Which
means one less kfree to worry about.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/gpu/drm/imagination/pvr_fw_trace.c | 21 +++++----------------
 1 file changed, 5 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/imagination/pvr_fw_trace.c b/drivers/gpu/drm/imagination/pvr_fw_trace.c
index e154cb35f604..caf504f2bf85 100644
--- a/drivers/gpu/drm/imagination/pvr_fw_trace.c
+++ b/drivers/gpu/drm/imagination/pvr_fw_trace.c
@@ -241,9 +241,6 @@ update_logtype(struct pvr_device *pvr_dev, u32 group_mask)
 }
 
 struct pvr_fw_trace_seq_data {
-	/** @buffer: Pointer to copy of trace data. */
-	u32 *buffer;
-
 	/** @start_offset: Starting offset in trace data, as reported by FW. */
 	u32 start_offset;
 
@@ -252,6 +249,9 @@ struct pvr_fw_trace_seq_data {
 
 	/** @assert_buf: Trace assert buffer, as reported by FW. */
 	struct rogue_fwif_file_info_buf assert_buf;
+
+	/** @buffer: Pointer to copy of trace data. */
+	u32 buffer[];
 };
 
 static u32 find_sfid(u32 id)
@@ -455,17 +455,10 @@ static int fw_trace_open(struct inode *inode, struct file *file)
 	struct pvr_fw_trace_seq_data *trace_seq_data;
 	int err;
 
-	trace_seq_data = kzalloc_obj(*trace_seq_data);
+	trace_seq_data = kzalloc_flex(*trace_seq_data, buffer, ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS);
 	if (!trace_seq_data)
 		return -ENOMEM;
 
-	trace_seq_data->buffer = kcalloc(ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS,
-					 sizeof(*trace_seq_data->buffer), GFP_KERNEL);
-	if (!trace_seq_data->buffer) {
-		err = -ENOMEM;
-		goto err_free_data;
-	}
-
 	/*
 	 * Take a local copy of the trace buffer, as firmware may still be
 	 * writing to it. This will exist as long as this file is open.
@@ -478,15 +471,12 @@ static int fw_trace_open(struct inode *inode, struct file *file)
 
 	err = seq_open(file, &pvr_fw_trace_seq_ops);
 	if (err)
-		goto err_free_buffer;
+		goto err_free_data;
 
 	((struct seq_file *)file->private_data)->private = trace_seq_data;
 
 	return 0;
 
-err_free_buffer:
-	kfree(trace_seq_data->buffer);
-
 err_free_data:
 	kfree(trace_seq_data);
 
@@ -499,7 +489,6 @@ static int fw_trace_release(struct inode *inode, struct file *file)
 		((struct seq_file *)file->private_data)->private;
 
 	seq_release(inode, file);
-	kfree(trace_seq_data->buffer);
 	kfree(trace_seq_data);
 
 	return 0;
-- 
2.53.0