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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>
hifive-unleashed-5.1
Roel Kluin 2009-04-06 19:00:54 -07:00 committed by Linus Torvalds
parent 93b61bddc1
commit c8fc657e6a
1 changed files with 2 additions and 1 deletions
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3
drivers/spi/spi_imx.c
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@ -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,