On Wed, Jun 26, 2013 at 04:49:02PM +0200, Michal Hocko wrote:
> 835f2f51 (staging: zcache: enable zcache to be built/loaded as a module)
> introduced in 3.10-rc1 has introduced a bug for zcache=FOO module
> parameter processing.
>
> zcache_comp_init return code doesn't agree with crypto_has_comp which
> uses 1 for the success unlike zcache_comp_init which uses 0. This
> causes module loading failure even if the given algorithm is supported:
> [ 0.815330] zcache: compressor initialization failed
>
> Reported-by: Cristian Rodríguez <crrodriguez@xxxxxxxxxxxx>
> Signed-off-by: Michal Hocko <mhocko@xxxxxxx>
Looks OK to me.
Cc-ing Greg.
> ---
> drivers/staging/zcache/zcache-main.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
> index dcceed2..0fe530b 100644
> --- a/drivers/staging/zcache/zcache-main.c
> +++ b/drivers/staging/zcache/zcache-main.c
> @@ -1811,10 +1811,12 @@ static int zcache_comp_init(void)
> #else
> if (*zcache_comp_name != '\0') {
> ret = crypto_has_comp(zcache_comp_name, 0, 0);
> - if (!ret)
> + if (!ret) {
> pr_info("zcache: %s not supported\n",
> zcache_comp_name);
> - goto out;
> + goto out;
> + }
> + goto out_alloc;
> }
> if (!ret)
> strcpy(zcache_comp_name, "lzo");
> @@ -1827,6 +1829,7 @@ static int zcache_comp_init(void)
> pr_info("zcache: using %s compressor\n", zcache_comp_name);
>
> /* alloc percpu transforms */
> +out_alloc:
> ret = 0;
> zcache_comp_pcpu_tfms = alloc_percpu(struct crypto_comp *);
> if (!zcache_comp_pcpu_tfms)
> --
> 1.8.3.1
>
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