This is a note to let you know that I've just added the patch titled
USB: sierra: fix remote wakeup
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-sierra-fix-remote-wakeup.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 80cc0fcbdaeaf10d04ba27779a2d7ceb73d2717a Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold@xxxxxxxxx>
Date: Mon, 26 May 2014 19:22:54 +0200
Subject: USB: sierra: fix remote wakeup
From: Johan Hovold <jhovold@xxxxxxxxx>
commit 80cc0fcbdaeaf10d04ba27779a2d7ceb73d2717a upstream.
Make sure that needs_remote_wake up is always set when there are open
ports.
Currently close() would unconditionally set needs_remote_wakeup to 0
even though there might still be open ports. This could lead to blocked
input and possibly dropped data on devices that do not support remote
wakeup (and which must therefore not be runtime suspended while open).
Add an open_ports counter (protected by the susp_lock) and only clear
needs_remote_wakeup when the last port is closed.
Fixes: e6929a9020ac ("USB: support for autosuspend in sierra while
online")
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/serial/sierra.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -58,6 +58,7 @@ struct sierra_intf_private {
spinlock_t susp_lock;
unsigned int suspended:1;
int in_flight;
+ unsigned int open_ports;
};
static int sierra_set_power_state(struct usb_device *udev, __u16 swiState)
@@ -768,7 +769,6 @@ static void sierra_close(struct usb_seri
mutex_lock(&serial->disc_mutex);
if (!serial->disconnected) {
- serial->interface->needs_remote_wakeup = 0;
/* odd error handling due to pm counters */
if (!usb_autopm_get_interface(serial->interface))
sierra_send_setup(port);
@@ -779,6 +779,8 @@ static void sierra_close(struct usb_seri
mutex_unlock(&serial->disc_mutex);
spin_lock_irq(&intfdata->susp_lock);
portdata->opened = 0;
+ if (--intfdata->open_ports == 0)
+ serial->interface->needs_remote_wakeup = 0;
spin_unlock_irq(&intfdata->susp_lock);
for (;;) {
@@ -834,9 +836,10 @@ static int sierra_open(struct tty_struct
sierra_send_setup(port);
- serial->interface->needs_remote_wakeup = 1;
spin_lock_irq(&intfdata->susp_lock);
portdata->opened = 1;
+ if (++intfdata->open_ports == 1)
+ serial->interface->needs_remote_wakeup = 1;
spin_unlock_irq(&intfdata->susp_lock);
usb_autopm_put_interface(serial->interface);
Patches currently in stable-queue which might be from jhovold@xxxxxxxxx are
queue-3.15/usb-sierra-fix-urb-and-memory-leak-in-resume-error-path.patch
queue-3.15/usb-sierra-fix-aa-deadlock-in-open-error-path.patch
queue-3.15/usb-usb_wwan-fix-urb-leak-at-shutdown.patch
queue-3.15/usb-option-fix-runtime-pm-handling.patch
queue-3.15/usb-sierra-fix-remote-wakeup.patch
queue-3.15/usb-sierra-fix-urb-and-memory-leak-on-disconnect.patch
queue-3.15/usb-sierra-fix-use-after-free-at-suspend-resume.patch
queue-3.15/usb-usb_wwan-fix-write-and-suspend-race.patch
queue-3.15/usb-usb_wwan-fix-potential-null-deref-at-resume.patch
queue-3.15/usb-usb_wwan-fix-race-between-write-and-resume.patch
queue-3.15/usb-usb_wwan-fix-potential-blocked-i-o-after-resume.patch
queue-3.15/usb-usb_wwan-fix-urb-leak-in-write-error-path.patch
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