[PATCH] spi: atmel: Fix scheduling while atomic bug

[Alexander Stein <alexanders83-S0/GAf8tV78@public.gmane.org>]

atmel_spi_lock does a spin_lock_irqsave, so we need to renable the
interrupts when we want to schedule.

Signed-off-by: Alexander Stein <alexanders83-S0/GAf8tV78@public.gmane.org>
---
I'm not sure what the lock is actually good for, so I kept it and release
it when we are about to schedule, thus reenabling interrupts.

 drivers/spi/spi-atmel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 5d7b07f..ae22f3d 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1130,8 +1130,11 @@ static int atmel_spi_one_transfer(struct spi_master *master,
 			atmel_spi_next_xfer_pio(master, xfer);
 		}
 
+		/* interrupts are disabled, so free the lock for schedule */
+		atmel_spi_unlock(as);
 		ret = wait_for_completion_timeout(&as->xfer_completion,
 							SPI_DMA_TIMEOUT);
+		atmel_spi_lock(as);
 		if (WARN_ON(ret == 0)) {
 			dev_err(&spi->dev,
 				"spi trasfer timeout, err %d\n", ret);
-- 
1.9.2

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