linux-kernel - Re: [PATCH] gianfar: reduce stack usage in gianfar

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Date:	Wed, 10 Aug 2011 10:20:07 +0800
From:	Wang Shaoyan <stufever@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	davem@...emloft.net, Wang Shaoyan <wangshaoyan.pt@...bao.com>
Subject: Re: [PATCH] gianfar: reduce stack usage in gianfar_ethtool.c

2011/8/10 Eric Dumazet <eric.dumazet@...il.com>:
> Le mercredi 10 août 2011 à 00:39 +0800, stufever@...il.com a écrit :
>> From: Wang Shaoyan <wangshaoyan.pt@...bao.com>
>>
>>   drivers/net/gianfar_ethtool.c:765: warning: the frame size of 2048 bytes is larger than 1024 bytes
>>
>> Signed-off-by: Wang Shaoyan <wangshaoyan.pt@...bao.com>
>> ---
>>  drivers/net/gianfar_ethtool.c |   20 +++++++++++++++++---
>>  1 files changed, 17 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/gianfar_ethtool.c b/drivers/net/gianfar_ethtool.c
>> index 6e35069..134fe1b 100644
>> --- a/drivers/net/gianfar_ethtool.c
>> +++ b/drivers/net/gianfar_ethtool.c
>> @@ -686,10 +686,21 @@ static int gfar_ethflow_to_filer_table(struct gfar_private *priv, u64 ethflow, u
>>  {
>>       unsigned int last_rule_idx = priv->cur_filer_idx;
>>       unsigned int cmp_rqfpr;
>> -     unsigned int local_rqfpr[MAX_FILER_IDX + 1];
>> -     unsigned int local_rqfcr[MAX_FILER_IDX + 1];
>> +     unsigned int *local_rqfpr;
>> +     unsigned int *local_rqfcr;
>>       int i = 0x0, k = 0x0;
>>       int j = MAX_FILER_IDX, l = 0x0;
>> +     int ret = 1;
>> +
>> +     local_rqfpr = kmalloc(sizeof(unsigned int) * (MAX_FILER_IDX + 1),
>> +             GFP_KERNEL);
>> +     local_rqfcr = kmalloc(sizeof(unsigned int) * (MAX_FILER_IDX + 1),
>> +             GFP_KERNEL);
>> +     if (!local_rqfpr || !local_rqfcr) {
>> +             pr_err("Out of memory\n");
>
>        Please remove this pr_err(), kmalloc() will complain already.
>
>> +             ret = 0;
>> +             got err;
>> +     }
>>
>>       switch (class) {
>>       case TCP_V4_FLOW:
>> @@ -765,7 +776,10 @@ static int gfar_ethflow_to_filer_table(struct gfar_private *priv, u64 ethflow, u
>>               priv->cur_filer_idx = priv->cur_filer_idx - 1;
>>       }
>>
>> -     return 1;
>> +err:
>> +     kfree(local_rqfcr);
>> +     kfree(local_rqfpr);
>> +     return ret;
>>  }
>>
>

Thanks, I will do it

> You should now track all "return 0;" done in this function to make sure
> no memory leak is added by your patch.
>
>
>
>



-- 
Wang Shaoyan
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