From d2998286fc58e3ac6c75ed4d3a1e77b618bbf2ae Mon Sep 17 00:00:00 2001 From: "Lad, Prabhakar" Date: Sat, 30 Jul 2016 22:28:24 +0100 Subject: [PATCH] spi: zynq_spi: Fix infinite looping while xfer During spi transfer, for example: sspi 1:1.0 8 ff the rx_len values will be: rx_len = 0 rx_len = 4294967295 This caused a busy looping during xfer, this patch fixes it by adding a check while reading the rx fifo Signed-off-by: Lad, Prabhakar Cc: Michal Simek Cc: Siva Durga Prasad Paladugu Reviewed-by: Jagan Teki --- drivers/spi/zynq_spi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/spi/zynq_spi.c b/drivers/spi/zynq_spi.c index 09ae1be7e9..dd3de2792d 100644 --- a/drivers/spi/zynq_spi.c +++ b/drivers/spi/zynq_spi.c @@ -230,7 +230,7 @@ static int zynq_spi_xfer(struct udevice *dev, unsigned int bitlen, /* Read the data from RX FIFO */ status = readl(®s->isr); - while (status & ZYNQ_SPI_IXR_RXNEMPTY_MASK) { + while ((status & ZYNQ_SPI_IXR_RXNEMPTY_MASK) && rx_len) { buf = readl(®s->rxdr); if (rx_buf) *rx_buf++ = buf; -- 2.25.1