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spi/omap-mcspi: check condition also after timeout 

It is possible that the handler gets interrupted after checking the
status. After it resumes the time out is due but the condition it was
waiting for might be true as well. Therefore it is necessary to check
the condition in case of an time out to be sure that the condition is
not true after the time passed by.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Sebastian Andrzej Siewior 2013-03-21 13:22:48 +01:00 committed by Mark Brown
parent e761f4236e
commit ff23fa3bb0
1 changed files with 6 additions and 2 deletions
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8
drivers/spi/spi-omap2-mcspi.c
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@ -285,8 +285,12 @@ static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
timeout = jiffies + msecs_to_jiffies(1000);
while (!(__raw_readl(reg) & bit)) {
if (time_after(jiffies, timeout))
return -1;
if (time_after(jiffies, timeout)) {
if (!(__raw_readl(reg) & bit))
return -ETIMEDOUT;
else
return 0;
}
cpu_relax();
}
return 0;