netdev - Re: [PATCH 2/3] ath10k: use dma_zalloc

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Date:   Tue, 24 Jan 2017 12:13:32 +0000
From:   "Valo, Kalle" <kvalo@....qualcomm.com>
To:     Joe Perches <joe@...ches.com>
CC:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        "ath10k@...ts.infradead.org" <ath10k@...ts.infradead.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] ath10k: use dma_zalloc_coherent()

Joe Perches <joe@...ches.com> writes:

> On Tue, 2017-01-24 at 05:18 +0000, Valo, Kalle wrote:
>> Joe Perches <joe@...ches.com> writes:
>> 
>> > On Mon, 2017-01-23 at 15:04 +0000, Srinivas Kandagatla wrote:
>> > > use dma_zalloc_coherent() instead of dma_alloc_coherent and memset().
>> > 
>> > []
>> > > diff --git a/drivers/net/wireless/ath/ath10k/pci.c
>> > > b/drivers/net/wireless/ath/ath10k/pci.c
>> > 
>> > []
>> > > @@ -896,7 +896,7 @@ static int ath10k_pci_diag_read_mem(struct ath10k *ar, u32 address, void *data,
>> > >  	 */
>> > >  	alloc_nbytes = min_t(unsigned int, nbytes, DIAG_TRANSFER_LIMIT);
>> > >  
>> > > -	data_buf = (unsigned char *)dma_alloc_coherent(ar->dev,
>> > > +	data_buf = (unsigned char *)dma_zalloc_coherent(ar->dev,
>> > >  						       alloc_nbytes,
>> > >  						       &ce_data_base,
>> > >  						       GFP_ATOMIC);
>> > 
>> > trivia:
>> > 
>> > Nicer to realign arguments and remove the unnecessary cast.
>> > 
>> > Perhaps:
>> > 
>> > 	data_buf = dma_zalloc_coherent(ar->dev, alloc_nbytes, &ce_data_base,
>> > 				       GFP_ATOMIC);
>> 
>> Sure, but that should be in a separate patch.
>
> I don't think so, trivial patches can be combined.
>
> It's also nicer to realign all modified multiline
> arguments when performing these changes.
>
> Coccinelle generally does it automatically.

A matter of preference really. I prefer keeping style and functional
changes in separate patches, keeps the review simple. And style changes
can hide bugs.

-- 
Kalle Valo