tree 8833a5b7f169942e41ba907c54ba817b64be4ba2
parent 8d160027ff234bddea627ba54c2b85efa1884867
author Mark Salter <msalter@redhat.com> 1355326598 +0000
committer David Howells <dhowells@redhat.com> 1355327174 +0000

MN10300: fix SMP synchronization between txdma and serial driver

The SoC serial port driver uses a high priority interrupt to handle tx of
characters in the tx ring buffer. The driver needs to disable/enable this IRQ
from outside of irq context. The original code to do this is not foolproof on
SMP machines because the IRQ running on one core could still access the serial
port for a short time after the driver running on another core disables the
interrupt. This patch adds a flag to tell the IRQ handler that the driver
wants to disable the interrupt. After seeing the flag, the IRQ handler will
immediately disable the interrupt and exit. After setting the flag, the driver
will wait for interrupt to be disabled by the IRQ handler.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>