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Date: Fri, 6 Mar 2009 14:42:44 +0800 From: Bryan Wu <cooloney@...nel.org> To: alan@...rguk.ukuu.org.uk Cc: linux-kernel@...r.kernel.org, Graf Yang <graf.yang@...log.com>, Bryan Wu <cooloney@...nel.org> Subject: [PATCH 02/18] Blackfin Serial Driver: use barrier instead of cpu_relax for Blackfin SMP like patch From: Graf Yang <graf.yang@...log.com> We are making a SMP like patch to blackfin, cpu_relax() is replaced by a data cache flush function which will count it to a per-cpu counter. If this serial function is called too early, the per-cpu data area have not been initialized, this call will cause crash. So we'd like to use barrier() instead of cpu_relax(). Signed-off-by: Graf Yang <graf.yang@...log.com> Signed-off-by: Bryan Wu <cooloney@...nel.org> --- drivers/serial/bfin_5xx.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c index 52ccc27..350bfc4 100644 --- a/drivers/serial/bfin_5xx.c +++ b/drivers/serial/bfin_5xx.c @@ -1129,7 +1129,8 @@ static __init void early_serial_putc(struct uart_port *port, int ch) struct bfin_serial_port *uart = (struct bfin_serial_port *)port; while ((!(UART_GET_LSR(uart) & THRE)) && --timeout) - cpu_relax(); + barrier(); + UART_PUT_CHAR(uart, ch); } -- 1.5.6.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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