linux-kernel - Re: [PATCH] scsi: target: return -ENOMEM when kzalloc failed

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Message-ID: <97a2129c-b1d8-de74-014a-07e89ae95b30@opensource.wdc.com>
Date:   Thu, 30 Mar 2023 20:00:54 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Chaitanya Kulkarni <chaitanyak@...dia.com>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "target-devel@...r.kernel.org" <target-devel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Abaci Robot <abaci@...ux.alibaba.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
Subject: Re: [PATCH] scsi: target: return -ENOMEM when kzalloc failed

On 3/30/23 16:59, Chaitanya Kulkarni wrote:
> On 3/29/23 19:38, Jiapeng Chong wrote:
>> The driver is using -1 instead of the -ENOMEM defined macro to specify
>> that a buffer allocation failed.
>>
>> drivers/target/iscsi/iscsi_target.c:691 iscsi_target_init_module() warn: returning -1 instead of -ENOMEM is sloppy.
>>
>> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
>> Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=4644
>> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
>> ---
>>   drivers/target/iscsi/iscsi_target.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
>> index 834cce50f9b0..d3a40c3caaf5 100644
>> --- a/drivers/target/iscsi/iscsi_target.c
>> +++ b/drivers/target/iscsi/iscsi_target.c
>> @@ -688,7 +688,7 @@ static int __init iscsi_target_init_module(void)
>>   	pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
>>   	iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
>>   	if (!iscsit_global)
>> -		return -1;
>> +		return -ENOMEM;
>>   
>>   	spin_lock_init(&iscsit_global->ts_bitmap_lock);
>>   	mutex_init(&auth_id_lock);
> 
> you can also just use goto out, it has return -ENOMEM, no biggy..
> Also, it will be useful to print the error message here as we
> are making this change..

Printing an error message for allocation failures is frowned upon. Checkpatch
will complain.

-- 
Damien Le Moal
Western Digital Research