linux-kernel - Re: [PATCH 1/1] drm/i915:Do not use kfree() to free kmem_cache

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Date:   Wed, 04 Apr 2018 11:16:42 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Xidong Wang <wangxidong_97@....com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Xidong Wang <wangxidong_97@....com>
Subject: Re: [PATCH 1/1] drm/i915:Do not use kfree() to free kmem_cache_alloc() return value

On Wed, 04 Apr 2018, Xidong Wang <wangxidong_97@....com> wrote:
> In eb_lookup_vmas(), lut, the return value of kmem_cache_alloc(), is freed
> with kfree().I think the expected paired function is kmem_cache_free().

Agreed. But did you try to compile your patch before sending?

Fixes: d1b48c1e7184 ("drm/i915: Replace execbuf vma ht with an idr")
Cc: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Cc: <stable@...r.kernel.org> # v4.14+

BR,
Jani.

>
> Signed-off-by: Xidong Wang <wangxidong_97@....com>
> ---
>  drivers/gpu/drm/i915/i915_gem_execbuffer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> index 8c170db..08fe476 100644
> --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> @@ -728,7 +728,7 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
>  
>  		err = radix_tree_insert(handles_vma, handle, vma);
>  		if (unlikely(err)) {
> -			kfree(lut);
> +			kmem_cache_free(lut);
>  			goto err_obj;
>  		}

-- 
Jani Nikula, Intel Open Source Technology Center