wm8940: fix resource reclaim in wm8940_register error path
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From: Guennadi Liakhovetski on 15 Jul 2010 03:10 Hi Axel On Thu, 15 Jul 2010, Axel Lin wrote: > >>From 44c93254e5158e3086c4707148d24746067f6b14 Mon Sep 17 00:00:00 2001 > From: Axel Lin <axel.lin(a)gmail.com> > Date: Thu, 15 Jul 2010 10:13:34 +0800 > Subject: [PATCH] wm8940: fix resource reclaim in wm8940_register error path > > This patch fixes the error path in wm8940_register to properly free resources. > > Signed-off-by: Axel Lin <axel.lin(a)gmail.com> Ok, these bugs are real, but let's fix them properly, i.e., release resources at the same level, where they have been acquired: static int register_codec(struct drv_priv *data) { int ret = snd_soc_register_codec(); if (ret < 0) return ret; ret = try(); if (failed) goto err; ... err: snd_soc_unregister_codec(); } static int probe() { int ret; struct drv_priv *data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; ret = register_codec(data); if (ret < 0) goto err; ... err: kfree(data); return ret; } That is, kfree() belongs to probe() and not to register_codec. This, of course, concerns all aour patches, at least those of them, that I have seen. Thanks Guennadi > --- > sound/soc/codecs/wm8940.c | 22 ++++++++++++++-------- > 1 files changed, 14 insertions(+), 8 deletions(-) > > diff --git a/sound/soc/codecs/wm8940.c b/sound/soc/codecs/wm8940.c > index e3c4bbf..9673e6f 100644 > --- a/sound/soc/codecs/wm8940.c > +++ b/sound/soc/codecs/wm8940.c > @@ -766,7 +766,8 @@ static int wm8940_register(struct wm8940_priv *wm8940, > u16 reg; > if (wm8940_codec) { > dev_err(codec->dev, "Another WM8940 is registered\n"); > - return -EINVAL; > + ret = -EINVAL; > + goto err; > } > > INIT_LIST_HEAD(&codec->dapm_widgets); > @@ -785,7 +786,7 @@ static int wm8940_register(struct wm8940_priv *wm8940, > ret = snd_soc_codec_set_cache_io(codec, 8, 16, control); > if (ret < 0) { > dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret); > - return ret; > + goto err; > } > > memcpy(codec->reg_cache, wm8940_reg_defaults, > @@ -794,7 +795,7 @@ static int wm8940_register(struct wm8940_priv *wm8940, > ret = wm8940_reset(codec); > if (ret < 0) { > dev_err(codec->dev, "Failed to issue reset\n"); > - return ret; > + goto err; > } > > wm8940_dai.dev = codec->dev; > @@ -803,7 +804,7 @@ static int wm8940_register(struct wm8940_priv *wm8940, > > ret = snd_soc_write(codec, WM8940_POWER1, 0x180); > if (ret < 0) > - return ret; > + goto err; > > if (!pdata) > dev_warn(codec->dev, "No platform data supplied\n"); > @@ -811,7 +812,7 @@ static int wm8940_register(struct wm8940_priv *wm8940, > reg = snd_soc_read(codec, WM8940_OUTPUTCTL); > ret = snd_soc_write(codec, WM8940_OUTPUTCTL, reg | pdata->vroi); > if (ret < 0) > - return ret; > + goto err; > } > > > @@ -820,17 +821,22 @@ static int wm8940_register(struct wm8940_priv *wm8940, > ret = snd_soc_register_codec(codec); > if (ret) { > dev_err(codec->dev, "Failed to register codec: %d\n", ret); > - return ret; > + goto err; > } > > ret = snd_soc_register_dai(&wm8940_dai); > if (ret) { > dev_err(codec->dev, "Failed to register DAI: %d\n", ret); > - snd_soc_unregister_codec(codec); > - return ret; > + goto err_codec; > } > > return 0; > + > +err_codec: > + snd_soc_unregister_codec(codec); > +err: > + kfree(wm8940); > + return ret; > } > > static void wm8940_unregister(struct wm8940_priv *wm8940) > -- > 1.5.4.3 > > > --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |