Re: [PATCH v1 2/2] mm: zswap: Consistently use IS_ERR_OR_NULL() to check acomp_ctx resources.

[Nhat Pham <nphamcs@gmail.com>]

On Mon, Jul 7, 2025 at 1:13 PM Kanchana P Sridhar
<kanchana.p.sridhar@intel.com> wrote:
>
> This patch uses IS_ERR_OR_NULL() in zswap_cpu_comp_prepare() to check
> for valid acomp/req, thereby making it consistent with acomp_ctx_dealloc().

Is acomp_ctx_dealloc() introduced by the other patch series? I can't
seem to find it.

Also, why IS_ERR_OR_NULL() in the first place. Can
crypto_alloc_acomp_node() returns NULL?

>
> Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@intel.com>
> ---
>  mm/zswap.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/zswap.c b/mm/zswap.c
> index 7970bd67f010..efd501a7fe29 100644
> --- a/mm/zswap.c
> +++ b/mm/zswap.c
> @@ -893,7 +893,7 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, struct hlist_node *node)
>                 return ret;
>
>         acomp_ctx->acomp = crypto_alloc_acomp_node(pool->tfm_name, 0, 0, cpu_to_node(cpu));
> -       if (IS_ERR(acomp_ctx->acomp)) {
> +       if (IS_ERR_OR_NULL(acomp_ctx->acomp)) {
>                 pr_err("could not alloc crypto acomp %s : %ld\n",
>                                 pool->tfm_name, PTR_ERR(acomp_ctx->acomp));
>                 ret = PTR_ERR(acomp_ctx->acomp);
> @@ -902,7 +902,7 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, struct hlist_node *node)
>         acomp_ctx->is_sleepable = acomp_is_async(acomp_ctx->acomp);
>
>         acomp_ctx->req = acomp_request_alloc(acomp_ctx->acomp);
> -       if (!acomp_ctx->req) {
> +       if (IS_ERR_OR_NULL(acomp_ctx->req)) {
>                 pr_err("could not alloc crypto acomp_request %s\n",
>                        pool->tfm_name);
>                 goto fail;
> --
> 2.27.0
>