ASoC: Taint the kernel if debugfs is used to write directly to CODECs

Since direct register writes may confuse the drivers and are supposed
to be used only in diagnostic situations discourage their use in
production by tainting the kernel when we do a write.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 4 insertions, 0 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index bac7291b6ff..96bf381683f 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -209,6 +209,10 @@ static ssize_t codec_reg_write_file(struct file *file,
 		start++;
 	if (strict_strtoul(start, 16, &value))
 		return -EINVAL;
+
+	/* Userspace has been fiddling around behind the kernel's back */
+	add_taint(TAINT_USER);
+
 	snd_soc_write(codec, reg, value);
 	return buf_size;
 }