From 94409cc1e507b157f8442dad80ff5e560c3205e5 Mon Sep 17 00:00:00 2001 From: Oliver Neukum Date: Mon, 11 Feb 2008 15:22:29 +0100 Subject: [PATCH] USB: fix usb open suspend race in cdc-acm this fixes a race between open and disconnect in the CDC ACM driver. Signed-off-by: Oliver Neukum Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-acm.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index bcc42136c93f..0147ea39340e 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -496,13 +496,10 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp) otherwise it is scheduled, and with high data rates data can get lost. */ tty->low_latency = 1; - if (usb_autopm_get_interface(acm->control)) { - mutex_unlock(&open_mutex); - return -EIO; - } + if (usb_autopm_get_interface(acm->control) < 0) + goto early_bail; mutex_lock(&acm->mutex); - mutex_unlock(&open_mutex); if (acm->used++) { usb_autopm_put_interface(acm->control); goto done; @@ -536,6 +533,7 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp) done: err_out: mutex_unlock(&acm->mutex); + mutex_unlock(&open_mutex); return rv; full_bailout: @@ -544,6 +542,8 @@ bail_out: usb_autopm_put_interface(acm->control); acm->used--; mutex_unlock(&acm->mutex); +early_bail: + mutex_unlock(&open_mutex); return -EIO; } -- 2.11.0