From aa70e567c4f0eeb849c6bcef3685bdf1fc3ca19d Mon Sep 17 00:00:00 2001 From: Nobuteru Hayashi Date: Fri, 18 Mar 2016 11:35:21 +0000 Subject: [PATCH] spi/fsl-espi: Don't wait transaction completion forever Because the eSPI driver uses wait_for_completion(), any stuck-able phenomenon at half-way transaction progress made worker task hang up. This phenomenon is perhaps caused by eSPI device errata which seems not to be published from vendor site yet. Anyway, we fix hang task by using fixed 2 seconds timeout that is our preferred value for eSPI maximum transaction size. It seems to be better that eSPI driver can detect this stuck and report error (EMSGSIZE) to the upper device driver because the upper device driver can decide to retry or recover. Signed-off-by: Nobuteru Hayashi Signed-off-by: Mark Brown --- drivers/spi/spi-fsl-espi.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c index 5d7fb81240cd..64d794b99803 100644 --- a/drivers/spi/spi-fsl-espi.c +++ b/drivers/spi/spi-fsl-espi.c @@ -245,7 +245,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t) if (ret) return ret; - wait_for_completion(&mpc8xxx_spi->done); + /* Won't hang up forever, SPI bus sometimes got lost interrupts... */ + ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ); + if (ret == 0) + dev_err(mpc8xxx_spi->dev, + "Transaction hanging up (left %d bytes)\n", + mpc8xxx_spi->count); /* disable rx ints */ mpc8xxx_spi_write_reg(®_base->mask, 0); -- 2.34.1