From: Christophe JAILLET <christophe.jaillet@wanadoo.fr> To: Radu Pirea <radu_nicolae.pirea@upb.ro>, Mark Brown <broonie@kernel.org>, Nicolas Ferre <nicolas.ferre@microchip.com>, Alexandre Belloni <alexandre.belloni@bootlin.com>, Claudiu Beznea <claudiu.beznea@tuxon.dev> Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Christophe JAILLET <christophe.jaillet@wanadoo.fr>, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH] spi: at91-usart: Remove some dead code Date: Sun, 17 Sep 2023 16:36:26 +0200 [thread overview] Message-ID: <84eb08daf85d203b34af9d8d08abf86804211413.1694961365.git.christophe.jaillet@wanadoo.fr> (raw) dma_request_chan() does not return NULL. It returns a valid pointer or an error pointer. So, some dead code can be removed. The IS_ERR_OR_NULL() in the error handling path are still needed, because the error handling path is common to the whole function and the ctlr->dma_xx are NULL when at91_usart_spi_configure_dma() is called. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> --- drivers/spi/spi-at91-usart.c | 22 ++++------------------ 1 file changed, 4 insertions(+), 18 deletions(-) diff --git a/drivers/spi/spi-at91-usart.c b/drivers/spi/spi-at91-usart.c index b11d0f993cc7..1cea8e159344 100644 --- a/drivers/spi/spi-at91-usart.c +++ b/drivers/spi/spi-at91-usart.c @@ -132,28 +132,14 @@ static int at91_usart_spi_configure_dma(struct spi_controller *ctlr, dma_cap_set(DMA_SLAVE, mask); ctlr->dma_tx = dma_request_chan(dev, "tx"); - if (IS_ERR_OR_NULL(ctlr->dma_tx)) { - if (IS_ERR(ctlr->dma_tx)) { - err = PTR_ERR(ctlr->dma_tx); - goto at91_usart_spi_error_clear; - } - - dev_dbg(dev, - "DMA TX channel not available, SPI unable to use DMA\n"); - err = -EBUSY; + if (IS_ERR(ctlr->dma_tx)) { + err = PTR_ERR(ctlr->dma_tx); goto at91_usart_spi_error_clear; } ctlr->dma_rx = dma_request_chan(dev, "rx"); - if (IS_ERR_OR_NULL(ctlr->dma_rx)) { - if (IS_ERR(ctlr->dma_rx)) { - err = PTR_ERR(ctlr->dma_rx); - goto at91_usart_spi_error; - } - - dev_dbg(dev, - "DMA RX channel not available, SPI unable to use DMA\n"); - err = -EBUSY; + if (IS_ERR(ctlr->dma_rx)) { + err = PTR_ERR(ctlr->dma_rx); goto at91_usart_spi_error; } -- 2.34.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr> To: Radu Pirea <radu_nicolae.pirea@upb.ro>, Mark Brown <broonie@kernel.org>, Nicolas Ferre <nicolas.ferre@microchip.com>, Alexandre Belloni <alexandre.belloni@bootlin.com>, Claudiu Beznea <claudiu.beznea@tuxon.dev> Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Christophe JAILLET <christophe.jaillet@wanadoo.fr>, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH] spi: at91-usart: Remove some dead code Date: Sun, 17 Sep 2023 16:36:26 +0200 [thread overview] Message-ID: <84eb08daf85d203b34af9d8d08abf86804211413.1694961365.git.christophe.jaillet@wanadoo.fr> (raw) dma_request_chan() does not return NULL. It returns a valid pointer or an error pointer. So, some dead code can be removed. The IS_ERR_OR_NULL() in the error handling path are still needed, because the error handling path is common to the whole function and the ctlr->dma_xx are NULL when at91_usart_spi_configure_dma() is called. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> --- drivers/spi/spi-at91-usart.c | 22 ++++------------------ 1 file changed, 4 insertions(+), 18 deletions(-) diff --git a/drivers/spi/spi-at91-usart.c b/drivers/spi/spi-at91-usart.c index b11d0f993cc7..1cea8e159344 100644 --- a/drivers/spi/spi-at91-usart.c +++ b/drivers/spi/spi-at91-usart.c @@ -132,28 +132,14 @@ static int at91_usart_spi_configure_dma(struct spi_controller *ctlr, dma_cap_set(DMA_SLAVE, mask); ctlr->dma_tx = dma_request_chan(dev, "tx"); - if (IS_ERR_OR_NULL(ctlr->dma_tx)) { - if (IS_ERR(ctlr->dma_tx)) { - err = PTR_ERR(ctlr->dma_tx); - goto at91_usart_spi_error_clear; - } - - dev_dbg(dev, - "DMA TX channel not available, SPI unable to use DMA\n"); - err = -EBUSY; + if (IS_ERR(ctlr->dma_tx)) { + err = PTR_ERR(ctlr->dma_tx); goto at91_usart_spi_error_clear; } ctlr->dma_rx = dma_request_chan(dev, "rx"); - if (IS_ERR_OR_NULL(ctlr->dma_rx)) { - if (IS_ERR(ctlr->dma_rx)) { - err = PTR_ERR(ctlr->dma_rx); - goto at91_usart_spi_error; - } - - dev_dbg(dev, - "DMA RX channel not available, SPI unable to use DMA\n"); - err = -EBUSY; + if (IS_ERR(ctlr->dma_rx)) { + err = PTR_ERR(ctlr->dma_rx); goto at91_usart_spi_error; } -- 2.34.1
next reply other threads:[~2023-09-17 14:37 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-09-17 14:36 Christophe JAILLET [this message] 2023-09-17 14:36 ` [PATCH] spi: at91-usart: Remove some dead code Christophe JAILLET 2023-09-26 9:22 ` Mark Brown 2023-09-26 9:22 ` Mark Brown
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