Commit 0d51a9cb authored Jan 06, 2011 by Mark Brown

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>

parent 9c6df19e

sound/soc/soc-core.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}