Re: [PATCH net-next v8 2/3] net: ethernet: ti: Add desc_infos member to struct k3_cppi_desc_pool

[Julien Panis <jpanis@baylibre.com>]

On 4/10/24 02:39, Jakub Kicinski wrote:
> On Mon, 08 Apr 2024 11:38:03 +0200 Julien Panis wrote:
>>   		goto gen_pool_create_fail;
>>   	}
>>   
>> +	pool->desc_infos = kcalloc(pool->num_desc,
>> +				   sizeof(*pool->desc_infos), GFP_KERNEL);
>> +	if (!pool->desc_infos) {
>> +		ret = -ENOMEM;
>> +		dev_err(pool->dev,
>> +			"pool descriptor infos alloc failed %d\n", ret);
> Please don't add errors on mem alloc failures. They just bloat the
> kernel, there will be a rather large OOM splat in the logs if GFP_KERNEL
> allocation fails.
>
>> +		kfree_const(pool_name);
>> +		goto gen_pool_desc_infos_alloc_fail;
>> +	}
>> +
>>   	pool->gen_pool->name = pool_name;
> If you add the new allocation after this line, I think you wouldn't
> have to free pool_name under the if () explicitly.

Hello Jakub,

Thanks for these suggestions, I'll implement them in next version.

Also, about mem alloc failures, shouldn't we free 'pool' on kstrdup_const()
error at the beginning of k3_cppi_desc_pool_create_name() ?
I mean, it's not visible in my patch but I now wonder if this was done
properly even before I modify the file.

Currently, we have:
     pool_name = kstrdup_const(...)
     if (!pool_name)
         return ERR_PTR(ret);

Shouldnt we have instead:
     pool_name = kstrdup_const(...)
     if (!pool_name)
         goto gen_pool_create_fail;
(maybe label to be renamed)
...so that 'pool' can be freed before returning error.

Julien