From 850a28ecd8044ef36b2c7699d2e3736a410b4d0a Mon Sep 17 00:00:00 2001 From: Vasily Khoruzhick Date: Wed, 6 Apr 2011 17:49:15 +0300 Subject: spi: Fix race condition in stop_queue() There's a race condition in stop_queue() in some drivers - if drv_data->queue is empty, but drv_data->busy is still set (or opposite situation) stop_queue will return -EBUSY. So fix loop condition to check that both drv_data->queue is empty and drv_data->busy is not set. This patch affects following drivers: pxa2xx_spi spi_bfin5xx amba-pl022 dw_spi Signed-off-by: Vasily Khoruzhick Acked-by: Eric Miao Acked-by: Mike Frysinger Signed-off-by: Grant Likely --- drivers/spi/amba-pl022.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/spi/amba-pl022.c') diff --git a/drivers/spi/amba-pl022.c b/drivers/spi/amba-pl022.c index 5a4e0afb9ad6..4b8357b728cb 100644 --- a/drivers/spi/amba-pl022.c +++ b/drivers/spi/amba-pl022.c @@ -1555,7 +1555,7 @@ static int stop_queue(struct pl022 *pl022) * A wait_queue on the pl022->busy could be used, but then the common * execution path (pump_messages) would be required to call wake_up or * friends on every SPI message. Do this instead */ - while (!list_empty(&pl022->queue) && pl022->busy && limit--) { + while ((!list_empty(&pl022->queue) || pl022->busy) && limit--) { spin_unlock_irqrestore(&pl022->queue_lock, flags); msleep(10); spin_lock_irqsave(&pl022->queue_lock, flags); -- cgit v1.2.3