75 lines
2.1 KiB
Diff
75 lines
2.1 KiB
Diff
From 23f717168dc55f69ad517d3ab5f412d04a5afc0e Mon Sep 17 00:00:00 2001
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From: David Plowman <david.plowman@raspberrypi.org>
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Date: Wed, 15 Jan 2020 13:40:38 +0000
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Subject: [PATCH] media: ov5647: Fix return codes from
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ov5647_write/ov5647_read functions.
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Previously they were returning positive non-zero codes for success,
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which were getting passed up the call stack. Since release 4.19,
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do_dentry_open (fs/open.c) has been catching these and flagging an
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error. (So this driver has been broken since that date.)
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Fixes: 3c2472a [media] media: i2c: Add support for OV5647 sensor
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Signed-off-by: David Plowman <david.plowman@raspberrypi.org>
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Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
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---
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drivers/media/i2c/ov5647.c | 30 +++++++++++++++++++++++++++---
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1 file changed, 27 insertions(+), 3 deletions(-)
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--- a/drivers/media/i2c/ov5647.c
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+++ b/drivers/media/i2c/ov5647.c
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@@ -214,9 +214,18 @@ static int ov5647_write(struct v4l2_subd
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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ret = i2c_master_send(client, data, 3);
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- if (ret < 0)
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+ /*
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+ * Writing the wrong number of bytes also needs to be flagged as an
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+ * error. Success needs to produce a 0 return code.
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+ */
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+ if (ret == 3) {
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+ ret = 0;
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+ } else {
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dev_dbg(&client->dev, "%s: i2c write error, reg: %x\n",
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__func__, reg);
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+ if (ret >= 0)
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+ ret = -EINVAL;
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+ }
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return ret;
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}
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@@ -228,16 +237,31 @@ static int ov5647_read(struct v4l2_subde
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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ret = i2c_master_send(client, data_w, 2);
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- if (ret < 0) {
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+ /*
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+ * A negative return code, or sending the wrong number of bytes, both
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+ * count as an error.
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+ */
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+ if (ret != 2) {
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dev_dbg(&client->dev, "%s: i2c write error, reg: %x\n",
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__func__, reg);
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+ if (ret >= 0)
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+ ret = -EINVAL;
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return ret;
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}
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ret = i2c_master_recv(client, val, 1);
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- if (ret < 0)
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+ /*
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+ * The only return value indicating success is 1. Anything else, even
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+ * a non-negative value, indicates something went wrong.
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+ */
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+ if (ret == 1) {
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+ ret = 0;
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+ } else {
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dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
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__func__, reg);
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+ if (ret >= 0)
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+ ret = -EINVAL;
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+ }
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return ret;
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}
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