diff options
author | Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | 2021-06-02 02:44:09 +0300 |
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committer | Mark Brown <broonie@kernel.org> | 2021-06-03 15:56:41 +0300 |
commit | d668a5e2409b2ff9291493b70c961ecbe883bfb2 (patch) | |
tree | bac964fd52a6cba78c981c2dc0fb89aedc57306a | |
parent | cb2f97d89f383dafa822bce66f0c3514dfb135b8 (diff) | |
download | linux-d668a5e2409b2ff9291493b70c961ecbe883bfb2.tar.xz |
ASoC: rsnd: adg: check return value for rsnd_adg_get_clkin/out()
Current rsnd_adg_get_clkin/out() are void function,
thus adg->clk/clkout[i] might be NULL.
But, for_each_rsnd_clk/clkout() macros are assuming
all clks are non NULL.
Because of this mismatch, code can be complex and/or buggy.
These functions return error by this patch,
and make sure all clks are non NULL.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87pmx5i20m.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
-rw-r--r-- | sound/soc/sh/rcar/adg.c | 84 |
1 files changed, 61 insertions, 23 deletions
diff --git a/sound/soc/sh/rcar/adg.c b/sound/soc/sh/rcar/adg.c index 3dfd07c8a7e3..0ebee1ed06a9 100644 --- a/sound/soc/sh/rcar/adg.c +++ b/sound/soc/sh/rcar/adg.c @@ -412,25 +412,53 @@ static struct clk *rsnd_adg_null_clk_get(struct rsnd_priv *priv) return adg->null_clk; } -static void rsnd_adg_get_clkin(struct rsnd_priv *priv) +static void rsnd_adg_null_clk_clean(struct rsnd_priv *priv) +{ + struct rsnd_adg *adg = priv->adg; + + if (adg->null_clk) + clk_unregister_fixed_rate(adg->null_clk); +} + +static int rsnd_adg_get_clkin(struct rsnd_priv *priv) { struct rsnd_adg *adg = priv->adg; struct device *dev = rsnd_priv_to_dev(priv); + struct clk *clk; int i; for (i = 0; i < CLKMAX; i++) { - struct clk *clk = devm_clk_get(dev, clk_name[i]); + clk = devm_clk_get(dev, clk_name[i]); if (IS_ERR(clk)) clk = rsnd_adg_null_clk_get(priv); if (IS_ERR(clk)) - dev_err(dev, "no adg clock (%s)\n", clk_name[i]); + goto err; adg->clk[i] = clk; } + + return 0; + +err: + dev_err(dev, "adg clock IN get failed\n"); + + rsnd_adg_null_clk_clean(priv); + + return -EIO; +} + +static void rsnd_adg_unregister_clkout(struct rsnd_priv *priv) +{ + struct rsnd_adg *adg = priv->adg; + struct clk *clk; + int i; + + for_each_rsnd_clkout(clk, adg, i) + clk_unregister_fixed_rate(clk); } -static void rsnd_adg_get_clkout(struct rsnd_priv *priv) +static int rsnd_adg_get_clkout(struct rsnd_priv *priv) { struct rsnd_adg *adg = priv->adg; struct clk *clk; @@ -472,9 +500,8 @@ static void rsnd_adg_get_clkout(struct rsnd_priv *priv) req_size = prop->length / sizeof(u32); if (req_size > REQ_SIZE) { - dev_err(dev, - "too many clock-frequency, use top %d\n", REQ_SIZE); - req_size = REQ_SIZE; + dev_err(dev, "too many clock-frequency\n"); + return -EINVAL; } of_property_read_u32_array(np, "clock-frequency", req_rate, req_size); @@ -555,10 +582,11 @@ static void rsnd_adg_get_clkout(struct rsnd_priv *priv) if (!count) { clk = clk_register_fixed_rate(dev, clkout_name[CLKOUT], parent_clk_name, 0, req_rate[0]); - if (!IS_ERR(clk)) { - adg->clkout[CLKOUT] = clk; - of_clk_add_provider(np, of_clk_src_simple_get, clk); - } + if (IS_ERR(clk)) + goto err; + + adg->clkout[CLKOUT] = clk; + of_clk_add_provider(np, of_clk_src_simple_get, clk); } /* * for clkout0/1/2/3 @@ -568,8 +596,10 @@ static void rsnd_adg_get_clkout(struct rsnd_priv *priv) clk = clk_register_fixed_rate(dev, clkout_name[i], parent_clk_name, 0, req_rate[0]); - if (!IS_ERR(clk)) - adg->clkout[i] = clk; + if (IS_ERR(clk)) + goto err; + + adg->clkout[i] = clk; } adg->onecell.clks = adg->clkout; adg->onecell.clk_num = CLKOUTMAX; @@ -581,6 +611,15 @@ rsnd_adg_get_clkout_end: adg->ckr = ckr; adg->rbga = rbga; adg->rbgb = rbgb; + + return 0; + +err: + dev_err(dev, "adg clock OUT get failed\n"); + + rsnd_adg_unregister_clkout(priv); + + return -EIO; } #if defined(DEBUG) || defined(CONFIG_DEBUG_FS) @@ -646,8 +685,13 @@ int rsnd_adg_probe(struct rsnd_priv *priv) priv->adg = adg; - rsnd_adg_get_clkin(priv); - rsnd_adg_get_clkout(priv); + ret = rsnd_adg_get_clkin(priv); + if (ret) + return ret; + + ret = rsnd_adg_get_clkout(priv); + if (ret) + return ret; rsnd_adg_clk_enable(priv); rsnd_adg_clk_dbg_info(priv, NULL); @@ -659,19 +703,13 @@ void rsnd_adg_remove(struct rsnd_priv *priv) { struct device *dev = rsnd_priv_to_dev(priv); struct device_node *np = dev->of_node; - struct rsnd_adg *adg = priv->adg; - struct clk *clk; - int i; - for_each_rsnd_clkout(clk, adg, i) - if (adg->clkout[i]) - clk_unregister_fixed_rate(adg->clkout[i]); + rsnd_adg_unregister_clkout(priv); of_clk_del_provider(np); rsnd_adg_clk_disable(priv); /* It should be called after rsnd_adg_clk_disable() */ - if (adg->null_clk) - clk_unregister_fixed_rate(adg->null_clk); + rsnd_adg_null_clk_clean(priv); } |