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Subject: =?UTF-8?Q?Re:_[PATCH_1/2]_mux:adgs1408/1409:_New_driver_for_Analog_?=
 =?UTF-8?Q?Devices_ADGS1408/1409_mux_=e2=80=a6?=
To:     Peter Rosin <peda@axentia.se>,
        Mircea Caprioru <mircea.caprioru@analog.com>
Cc:     davem@davemloft.net, mchehab+samsung@kernel.org,
        akpm@linux-foundation.org, rdunlap@infradead.org,
        linux-kernel@vger.kernel.org
References: <20180713122738.5888-1-mircea.caprioru@analog.com>
 <b3540119-73e1-38d5-1dc9-ce9f8bdad9e8@axentia.se>
From:   Lars-Peter Clausen <lars@metafoo.de>
Message-ID: <059d9750-8715-bc4e-185f-d52b48ad9b59@metafoo.de>
Date:   Sat, 14 Jul 2018 16:02:51 +0200
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On 07/14/2018 02:04 PM, Peter Rosin wrote:
[...]
>> +static int adgs140x_spi_reg_write(struct spi_device *spi,
>> +				u8 reg_addr, u8 reg_data)
>> +{
>> +	u8 tx_buf[2];
>> +
>> +	tx_buf[0] = reg_addr;
>> +	tx_buf[1] = reg_data;
>> +
>> +	return spi_write_then_read(spi, tx_buf, sizeof(tx_buf), NULL, 0);
> 
> 	return spi_write(spi, tx_buf, sizeof(tx_buf));

Be aware spi_write_then_read() can handle on stack buffers, spi_write() can't.