The patch below does not apply to the 3.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 703df3297fb1950b0aa53e656108eb936d3f21d9 Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold@xxxxxxxxx>
Date: Mon, 26 May 2014 19:23:42 +0200
Subject: [PATCH] USB: cdc-acm: fix open and suspend race
We must not do the usb_autopm_put_interface() before submitting the read
urbs or we might end up doing I/O to a suspended device.
Fixes: 088c64f81284 ("USB: cdc-acm: re-write read processing")
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index c255e77282ad..74df311c8505 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -528,19 +528,15 @@ static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
dev_err(&acm->control->dev,
"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
- usb_autopm_put_interface(acm->control);
goto error_submit_urb;
}
acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
if (acm_set_control(acm, acm->ctrlout) < 0 &&
(acm->ctrl_caps & USB_CDC_CAP_LINE)) {
- usb_autopm_put_interface(acm->control);
goto error_set_control;
}
- usb_autopm_put_interface(acm->control);
-
/*
* Unthrottle device in case the TTY was closed while throttled.
*/
@@ -552,6 +548,8 @@ static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
if (acm_submit_read_urbs(acm, GFP_KERNEL))
goto error_submit_read_urbs;
+ usb_autopm_put_interface(acm->control);
+
mutex_unlock(&acm->mutex);
return 0;
@@ -562,6 +560,7 @@ error_submit_read_urbs:
error_set_control:
usb_kill_urb(acm->ctrlurb);
error_submit_urb:
+ usb_autopm_put_interface(acm->control);
error_get_interface:
disconnected:
mutex_unlock(&acm->mutex);
--
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