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Date:   Sun, 20 Feb 2022 16:40:44 +0800
From:   Baoquan He <bhe@redhat.com>
To:     Christoph Hellwig <hch@lst.de>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        akpm@linux-foundation.org, cl@linux.com, 42.hyeyoo@gmail.com,
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        herbert@gondor.apana.org.au, davem@davemloft.net,
        linux-crypto@vger.kernel.org, steffen.klassert@secunet.com,
        netdev@vger.kernel.org, hca@linux.ibm.com, gor@linux.ibm.com,
        agordeev@linux.ibm.com, borntraeger@linux.ibm.com,
        svens@linux.ibm.com, linux-s390@vger.kernel.org, michael@walle.cc,
        linux-i2c@vger.kernel.org, wsa@kernel.org
Subject: Re: [PATCH 21/22] mmc: wbsd: Use dma_alloc_noncoherent() for dma
 buffer
Message-ID: <20220220084044.GC93179@MiWiFi-R3L-srv>
References: <20220219005221.634-1-bhe@redhat.com>
 <20220219005221.634-22-bhe@redhat.com>
 <20220219071730.GG26711@lst.de>
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On 02/19/22 at 08:17am, Christoph Hellwig wrote:
> On Sat, Feb 19, 2022 at 08:52:20AM +0800, Baoquan He wrote:
> >  	if (request_dma(dma, DRIVER_NAME))
> >  		goto err;
> >  
> > +	dma_set_mask_and_coherent(mmc_dev(host->mmc), DMA_BIT_MASK(24));
> 
> This also sets the streaming mask, but the driver doesn't seem to make
> use of that.  Please document it in the commit log.

Thanks for reviewing. I will change it to dma_set_mask(), and describe
this change in patch log.

> 
> Also setting smaller than 32 bit masks can fail, so this should have
> error handling.

OK, will check and add error handling.