Commit e5d9cfc6 authored by Andrzej Hajda's avatar Andrzej Hajda Committed by Mark Brown
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ASoC: rsnd: fix usrcnt decrementing bug 

Field usrcnt is unsigned so it cannot be lesser than zero.
The patch fixes the check, moves it to the beginning of the function
and changes return value to -EIO in case of usercnt error.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2038576



Signed-off-by: default avatarAndrzej Hajda <a.hajda@samsung.com>
Acked-by: default avatarKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent b4c83b17

sound/soc/sh/rcar/ssi.c

+14 −13
Original line number Diff line number Diff line
@@ -403,29 +403,30 @@ static int rsnd_ssi_quit(struct rsnd_mod *mod, 
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);

	struct device *dev = rsnd_priv_to_dev(priv);



	if (rsnd_ssi_is_parent(mod, io))

		goto rsnd_ssi_quit_end;

	if (!ssi->usrcnt) {

		dev_err(dev, "%s[%d] usrcnt error\n",

			rsnd_mod_name(mod), rsnd_mod_id(mod));

		return -EIO;

	}



	if (!rsnd_ssi_is_parent(mod, io)) {

		if (ssi->err > 0)

			dev_warn(dev, "%s[%d] under/over flow err = %d\n",

			 rsnd_mod_name(mod), rsnd_mod_id(mod), ssi->err);

				 rsnd_mod_name(mod), rsnd_mod_id(mod),

				 ssi->err);



		ssi->cr_own	= 0;

		ssi->err	= 0;



		rsnd_ssi_irq_disable(mod);

	}



rsnd_ssi_quit_end:

	rsnd_ssi_master_clk_stop(ssi, io);



	rsnd_mod_power_off(mod);



	ssi->usrcnt--;



	if (ssi->usrcnt < 0)

		dev_err(dev, "%s[%d] usrcnt error\n",

			rsnd_mod_name(mod), rsnd_mod_id(mod));



	return 0;

}