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SubjectRe: [alsa-devel] [PATCH] fix the kernel panic due to wrong use the dev memory API
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On 11/5/18 2:29 AM, He, Bo wrote:
> skl->dais is allocated with devm_kcalloc, can't free with
> the krealloc. Memory allocated with devm API is automatically freed
> on driver detach, Like all other devres resources.
>
> Refer to drivers/base/devres.c devm_kmalloc for more details.

What code are you looking at?

I see this in the Mark's tree

int skl_platform_register(struct device *dev)
{
    int ret;
    struct snd_soc_dai_driver *dais;
    int num_dais = ARRAY_SIZE(skl_platform_dai);
    struct hdac_bus *bus = dev_get_drvdata(dev);
    struct skl *skl = bus_to_skl(bus);

    INIT_LIST_HEAD(&skl->ppl_list);
    INIT_LIST_HEAD(&skl->bind_list);

    skl->dais = kmemdup(skl_platform_dai, sizeof(skl_platform_dai),
                GFP_KERNEL);
    if (!skl->dais) {
        ret = -ENOMEM;
        goto err;
    }

    if (!skl->use_tplg_pcm) {
        dais = krealloc(skl->dais, sizeof(skl_fe_dai) +
                sizeof(skl_platform_dai), GFP_KERNEL);


No trace of devm as you mention it? I checked the Chrome tree as well
and it's not there.

What am I missing?


>
> Signed-off-by: he, bo <bo.he@intel.com>
> ---
> sound/soc/intel/skylake/skl-pcm.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/sound/soc/intel/skylake/skl-pcm.c b/sound/soc/intel/skylake/skl-pcm.c
> index 823e391..928d314 100644
> --- a/sound/soc/intel/skylake/skl-pcm.c
> +++ b/sound/soc/intel/skylake/skl-pcm.c
> @@ -1438,7 +1438,8 @@ int skl_platform_register(struct device *dev)
> }
>
> if (!skl->use_tplg_pcm) {
> - dais = krealloc(skl->dais, sizeof(skl_fe_dai) +
> + devm_kfree(dev, skl->dais);
> + dais = devm_kcalloc(dev, skl->dais, sizeof(skl_fe_dai) +
> sizeof(skl_platform_dai), GFP_KERNEL);
> if (!dais) {
> ret = -ENOMEM;
> @@ -1472,7 +1473,5 @@ int skl_platform_unregister(struct device *dev)
> }
> }
>
> - kfree(skl->dais);
> -
> return 0;
> }

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