linux-kernel - Re: [PATCH -next] crypto: ccree - remove set but not used variable 'du

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Date:   Sun, 28 Apr 2019 16:16:01 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     Gilad Ben-Yossef <gilad@...yossef.com>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH -next] crypto: ccree - remove set but not used variable
 'du_size'

On 2019/4/28 15:58, Gilad Ben-Yossef wrote:
> On Fri, Apr 26, 2019 at 7:38 PM Yue Haibing <yuehaibing@...wei.com> wrote:
>>
>> From: YueHaibing <yuehaibing@...wei.com>
>>
>> Fixes gcc '-Wunused-but-set-variable' warning:
>>
>> drivers/crypto/ccree/cc_cipher.c: In function cc_setup_key_desc:
>> drivers/crypto/ccree/cc_cipher.c:645:15: warning: variable du_size set but not used [-Wunused-but-set-variable]
>>
>> It is never used since introduction in
>> commit dd8486c75085 ("crypto: ccree - move key load desc. before flow desc.")
>>
>> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
>> ---
>>  drivers/crypto/ccree/cc_cipher.c | 4 ----
>>  1 file changed, 4 deletions(-)
>>
>> diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c
>> index d9f8cd5..6bd3791 100644
>> --- a/drivers/crypto/ccree/cc_cipher.c
>> +++ b/drivers/crypto/ccree/cc_cipher.c
>> @@ -642,16 +642,12 @@ static void cc_setup_key_desc(struct crypto_tfm *tfm,
>>         int direction = req_ctx->gen_ctx.op_type;
>>         dma_addr_t key_dma_addr = ctx_p->user.key_dma_addr;
>>         unsigned int key_len = ctx_p->keylen;
>> -       unsigned int du_size = nbytes;
>>         unsigned int din_size;
>>
>>         struct cc_crypto_alg *cc_alg =
>>                 container_of(tfm->__crt_alg, struct cc_crypto_alg,
>>                              skcipher_alg.base);
>>
>> -       if (cc_alg->data_unit)
>> -               du_size = cc_alg->data_unit;
> 
> Thanks!
> This is a good catch. It seems we can also drop the whole cc_alg var
> as well in this case,
> since it is only used by the code setting du_size....
> 
> Do you want to send a patch doing both or shall I ?

Yes, will send v2, thanks!
> 
> Cheers,
> Gilad
>