Commit c8fc657e authored Apr 06, 2009 by Roel Kluin Committed by Linus Torvalds Apr 07, 2009

spi: limit reaches -1, tested 0



With a postfix decrement limit will reach -1 rather than 0, so the warning
will not be issued.

Also, add a cpu_relax() into the busy-wait loop.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Mariusz Ceier <mceier@gmail.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 93b61bdd

drivers/spi/spi_imx.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -779,7 +779,8 @@ static irqreturn_t interrupt_transfer(struct driver_data *drv_data)

		/* Read trailing bytes */
		limit = loops_per_jiffy << 1;
		while ((read(drv_data) == 0) && limit--);
		while ((read(drv_data) == 0) && --limit)
		cpu_relax();

		if (limit == 0)
		dev_err(&drv_data->pdev->dev,