jun qian [off-list ref] 于2018年8月27日周一 下午10:49写道：

Before the program enters the uart ISR, the local interrupt has been
disabled by the system, so it's not appropriate to use spin_lock_irqsave
interface in the ISR.

Signed-off-by: jun qian <redacted>

many discussions have been done with jun in wechat regarding this patch. and

Reviewed-by: Barry Song <redacted>

---
 drivers/tty/serial/imx.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)