tty: smux_ctl: close SMUX port during SSR
If a subsystem restart occurs, the SMUX port needs to be closed when the
platform device is removed and then re-opened when the platform device
is probed again. Without this functionality, the SMUX port state is not
properly reset resulting in a data stall.
Add code to close the SMUX port when the platform device is removed.
CRs-Fixed: 474388
Change-Id: I00039fa517a5cf6b4d9230114cac7c6c9bbba9d1
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>
diff --git a/drivers/tty/smux_ctl.c b/drivers/tty/smux_ctl.c
index 2e091cc..1b3a7abe 100644
--- a/drivers/tty/smux_ctl.c
+++ b/drivers/tty/smux_ctl.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -940,6 +940,7 @@
static int smux_ctl_remove(struct platform_device *pdev)
{
int i;
+ int ret;
SMUXCTL_DBG(SMUX_CTL_MODULE_NAME ": %s Begins\n", __func__);
@@ -950,6 +951,13 @@
devp->abort_wait = 1;
wake_up(&devp->write_wait_queue);
wake_up(&devp->read_wait_queue);
+
+ if (atomic_read(&devp->ref_count)) {
+ ret = msm_smux_close(devp->id);
+ if (ret)
+ pr_err("%s: unable to close ch %d, ret %d\n",
+ __func__, devp->id, ret);
+ }
mutex_unlock(&devp->dev_lock);
/* Empty RX queue */