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spi/pl022: use cpu_relax in the busy loop

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This relaxes the cpu in the polling busy-wait loop.

Reported-by: Vitaly Wool <vitalywool@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Linus Walleij
2011-05-19 20:01:25 +02:00
committed by Grant Likely
parent 7f9a4b9797
commit 521999bd4a
1 changed files with 1 additions and 0 deletions
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drivers/spi/amba-pl022.c
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@@ -1424,6 +1424,7 @@ static void do_polling_transfer(struct pl022 *pl022)
message->state = STATE_ERROR; message->state = STATE_ERROR;
goto out; goto out;
} }
cpu_relax();
} }
/* Update total byte transferred */ /* Update total byte transferred */