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>
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@ -779,7 +779,8 @@ static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
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/* Read trailing bytes */
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limit = loops_per_jiffy << 1;
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while ((read(drv_data) == 0) && limit--);
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while ((read(drv_data) == 0) && --limit)
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cpu_relax();
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if (limit == 0)
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dev_err(&drv_data->pdev->dev,
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