linux-kernel - Re: [PATCH] staging:r8723bs: remove wrappers around skb

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Message-ID: <8e4df253-e021-6c29-96ab-24eed9b61eb2@gmail.com>
Date:   Sun, 31 May 2020 20:28:10 +0300
From:   Ivan Safonov <insafonov@...il.com>
To:     Joe Perches <joe@...ches.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Hans de Goede <hdegoede@...hat.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Nishka Dasgupta <nishkadg.linux@...il.com>,
        Lukasz Szczesny <luk@...cz.pl>, R Veera Kumar <vkor@...en.in>,
        Hariprasad Kelam <hariprasad.kelam@...il.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Shobhit Kukreti <shobhitkukreti@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Pascal Terjan <pterjan@...gle.com>, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging:r8723bs: remove wrappers around skb_clone()

On 5/31/20 7:15 PM, Joe Perches wrote:
> On Sun, 2020-05-31 at 19:08 +0300, Ivan Safonov wrote:
>> Wrappers around skb_clone() do not simplify the driver code.
> []
>> -inline struct sk_buff *_rtw_skb_clone(struct sk_buff *skb)
>> -{
>> -	return skb_clone(skb, in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
>> -}
>> -
> []
>> diff --git a/drivers/staging/rtl8723bs/os_dep/recv_linux.c b/drivers/staging/rtl8723bs/os_dep/recv_linux.c
> []
>> @@ -110,7 +110,7 @@ void rtw_os_recv_indicate_pkt(struct adapter *padapter, _pkt *pkt, struct rx_pkt
>>   			if (memcmp(pattrib->dst, myid(&padapter->eeprompriv), ETH_ALEN)) {
>>   				if (bmcast) {
>>   					psta = rtw_get_bcmc_stainfo(padapter);
>> -					pskb2 = rtw_skb_clone(pkt);
>> +					pskb2 = skb_clone(pkt, GFP_ATOMIC);
> 
> Why make every clone allocation GFP_ATOMIC ?

The rtw_os_recv_indicate_pkt() is always called from an interrupt handler.