linux-kernel - Re: [PATCH v2 4/4] spi: spi-fsl-dspi: Minor code cleanup and error path fixes

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Date:   Tue, 22 Nov 2016 11:42:23 +0530
From:   maitysanchayan@...il.com
To:     Stefan Agner <stefan@...er.ch>
Cc:     broonie@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org
Subject: Re: [PATCH v2 4/4] spi: spi-fsl-dspi: Minor code cleanup and error
 path fixes

On 16-11-21 15:22:09, Stefan Agner wrote:
> On 2016-11-20 21:54, Sanchayan Maity wrote:
> > Code cleanup for improving code readability and error path fixes
> > and cleanup removing use of devm_kfree.
> 
> Two things in one, not very nice. Especially the dma_free_coherent is
> really a bug and the other is a cleanup. Can you make a separate patch
> for the bug?
> 
> As for the cleanup, I don't like the one line conditions too, but I
> don't think it is worth a patch. At least the TX path should be solved
> with my suggestion in patch 2.

Agreed.

- Sanchayan.

> 
> --
> Stefan
> 
> > 
> > Signed-off-by: Sanchayan Maity <maitysanchayan@...il.com>
> > ---
> >  drivers/spi/spi-fsl-dspi.c | 22 ++++++++++++++++------
> >  1 file changed, 16 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
> > index 08882f7..2987a16 100644
> > --- a/drivers/spi/spi-fsl-dspi.c
> > +++ b/drivers/spi/spi-fsl-dspi.c
> > @@ -226,8 +226,10 @@ static void dspi_rx_dma_callback(void *arg)
> >  	if (!(dspi->dataflags & TRAN_STATE_RX_VOID)) {
> >  		for (i = 0; i < dma->curr_xfer_len; i++) {
> >  			d = dspi->dma->rx_dma_buf[i];
> > -			rx_word ? (*(u16 *)dspi->rx = d) :
> > -						(*(u8 *)dspi->rx = d);
> > +			if (rx_word)
> > +				*(u16 *)dspi->rx = d;
> > +			else
> > +				*(u8 *)dspi->rx = d;
> >  			dspi->rx += rx_word + 1;
> >  		}
> >  	}
> > @@ -247,14 +249,20 @@ static int dspi_next_xfer_dma_submit(struct
> > fsl_dspi *dspi)
> >  	tx_word = is_double_byte_mode(dspi);
> >  
> >  	for (i = 0; i < dma->curr_xfer_len - 1; i++) {
> > -		val = tx_word ? *(u16 *) dspi->tx : *(u8 *) dspi->tx;
> > +		if (tx_word)
> > +			val = *(u16 *) dspi->tx;
> > +		else
> > +			val = *(u8 *) dspi->tx;
> >  		dspi->dma->tx_dma_buf[i] =
> >  			SPI_PUSHR_TXDATA(val) | SPI_PUSHR_PCS(dspi->cs) |
> >  			SPI_PUSHR_CTAS(0) | SPI_PUSHR_CONT;
> >  		dspi->tx += tx_word + 1;
> >  	}
> >  
> > -	val = tx_word ? *(u16 *) dspi->tx : *(u8 *) dspi->tx;
> > +	if (tx_word)
> > +		val = *(u16 *) dspi->tx;
> > +	else
> > +		val = *(u8 *) dspi->tx;
> >  	dspi->dma->tx_dma_buf[i] = SPI_PUSHR_TXDATA(val) |
> >  					SPI_PUSHR_PCS(dspi->cs) |
> >  					SPI_PUSHR_CTAS(0);
> > @@ -430,9 +438,11 @@ static int dspi_request_dma(struct fsl_dspi
> > *dspi, phys_addr_t phy_addr)
> >  	return 0;
> >  
> >  err_slave_config:
> > -	devm_kfree(dev, dma->rx_dma_buf);
> > +	dma_free_coherent(dev, DSPI_DMA_BUFSIZE,
> > +			dma->rx_dma_buf, dma->rx_dma_phys);
> >  err_rx_dma_buf:
> > -	devm_kfree(dev, dma->tx_dma_buf);
> > +	dma_free_coherent(dev, DSPI_DMA_BUFSIZE,
> > +			dma->tx_dma_buf, dma->tx_dma_phys);
> >  err_tx_dma_buf:
> >  	dma_release_channel(dma->chan_tx);
> >  err_tx_channel: