Unverified Commit 084de523 authored by Alain Volmat's avatar Alain Volmat Committed by Mark Brown
Browse files

spi: stm32h7: ensure message are smaller than max size 



Ensure that messages given to transfer_one handler can actually be
handled by it. For that purpose rely on the SPI framework
spi_split_transfers_maxsize function to split messages whenever necessary.

Signed-off-by: default avatarAlain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/1612551572-495-5-git-send-email-alain.volmat@foss.st.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 5a380b83

drivers/spi/spi-stm32.c

+14 −0
Original line number Diff line number Diff line
@@ -1004,6 +1004,20 @@ static int stm32_spi_prepare_msg(struct spi_master *master, 
		!!(spi_dev->mode & SPI_LSB_FIRST),

		!!(spi_dev->mode & SPI_CS_HIGH));



	/* On STM32H7, messages should not exceed a maximum size setted

	 * afterward via the set_number_of_data function. In order to

	 * ensure that, split large messages into several messages

	 */

	if (spi->cfg->set_number_of_data) {

		int ret;



		ret = spi_split_transfers_maxsize(master, msg,

						  STM32H7_SPI_TSIZE_MAX,

						  GFP_KERNEL | GFP_DMA);

		if (ret)

			return ret;

	}



	spin_lock_irqsave(&spi->lock, flags);



	/* CPOL, CPHA and LSB FIRST bits have common register */