From 60738f605b9575714c8d959425b317692e72c6e3 Mon Sep 17 00:00:00 2001 From: Chase Southwood Date: Thu, 16 Jan 2014 12:27:29 -0600 Subject: [PATCH] Staging: comedi: convert while loop to timeout in ni_mio_common.c This patch for ni_mio_common.c changes out a while loop for a timeout, which is preferred. Signed-off-by: Chase Southwood Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/ni_mio_common.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c index 457b88481db0..10c27cb278cb 100644 --- a/drivers/staging/comedi/drivers/ni_mio_common.c +++ b/drivers/staging/comedi/drivers/ni_mio_common.c @@ -687,12 +687,22 @@ static void ni_clear_ai_fifo(struct comedi_device *dev) { const struct ni_board_struct *board = comedi_board(dev); struct ni_private *devpriv = dev->private; + static const int timeout = 10000; + int i; if (board->reg_type == ni_reg_6143) { /* Flush the 6143 data FIFO */ ni_writel(0x10, AIFIFO_Control_6143); /* Flush fifo */ ni_writel(0x00, AIFIFO_Control_6143); /* Flush fifo */ - while (ni_readl(AIFIFO_Status_6143) & 0x10) ; /* Wait for complete */ + /* Wait for complete */ + for (i = 0; i < timeout; i++) { + if (!(ni_readl(AIFIFO_Status_6143) & 0x10)) + break; + udelay(1); + } + if (i == timeout) { + comedi_error(dev, "FIFO flush timeout."); + } } else { devpriv->stc_writew(dev, 1, ADC_FIFO_Clear); if (board->reg_type == ni_reg_625x) { -- 2.20.1