diff options
| author | Johan Hovold <jhovold@gmail.com> | 2014-05-26 19:23:42 +0200 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-07-04 11:51:10 +0200 |
| commit | d50fd56a9a05493ea25b8f8c34c7212dfb47a82e (patch) | |
| tree | cb234fe8d284617b6fc2df9a3aa8a70a315435d9 /drivers/usb | |
| parent | 7519c7d9018ebb0ffa5cd172527b05791ab15cc8 (diff) | |
USB: cdc-acm: fix open and suspend race
commit 703df3297fb1950b0aa53e656108eb936d3f21d9 upstream.
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@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 4d7d54195..b713f08c1 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -826,19 +826,15 @@ 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. */ @@ -850,6 +846,8 @@ 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; @@ -862,6 +860,7 @@ 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); |