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ASoC: rsnd: fix usrcnt decrementing bug

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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: Andrzej Hajda <[email protected]>
Acked-by: Kuninori Morimoto <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
This commit is contained in:
Andrzej Hajda 2015-12-24 08:02:39 +01:00 • committed by Mark Brown
commit e5d9cfc6f5
1 changed files with 14 additions and 13 deletions
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27
sound/soc/sh/rcar/ssi.c
View file

@ -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 (ssi->err > 0)
dev_warn(dev, "%s[%d] under/over flow err = %d\n",
rsnd_mod_name(mod), rsnd_mod_id(mod), ssi->err);
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);
ssi->cr_own = 0;
ssi->err = 0;
ssi->cr_own = 0;
ssi->err = 0;
rsnd_ssi_irq_disable(mod);
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;
}