[alsa-devel] [PATCH] ASoC: Taint the kernel if debugfs is used to write directly to CODECs

[Mark Brown]

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 at opensource.wolfsonmciro.com>
---
 sound/soc/soc-core.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index a233607..dbca5023 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;
 }
-- 
1.7.2.3