Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755886AbaF1Rvs (ORCPT ); Sat, 28 Jun 2014 13:51:48 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:54152 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755855AbaF1Rvn (ORCPT ); Sat, 28 Jun 2014 13:51:43 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold Subject: [PATCH 3.15 053/139] USB: usb_wwan: fix potential blocked I/O after resume Date: Sat, 28 Jun 2014 10:46:54 -0700 Message-Id: <20140628174607.866264344@linuxfoundation.org> X-Mailer: git-send-email 2.0.1 In-Reply-To: <20140628174605.352098823@linuxfoundation.org> References: <20140628174605.352098823@linuxfoundation.org> User-Agent: quilt/0.63-1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit fb7ad4f93d9f0f7d49beda32f5e7becb94b29a4d upstream. Keep trying to submit urbs rather than bail out on first read-urb submission error, which would also prevent I/O for any further ports from being resumed. Instead keep an error count, for all types of failed submissions, and let USB core know that something went wrong. Also make sure to always clear the suspended flag. Currently a failed read-urb submission would prevent cached writes as well as any subsequent writes from being submitted until next suspend-resume cycle, something which may not even necessarily happen. Note that USB core currently only logs an error if an interface resume failed. Fixes: 383cedc3bb43 ("USB: serial: full autosuspend support for the option driver") Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/usb_wwan.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) --- a/drivers/usb/serial/usb_wwan.c +++ b/drivers/usb/serial/usb_wwan.c @@ -619,12 +619,12 @@ int usb_wwan_suspend(struct usb_serial * } EXPORT_SYMBOL(usb_wwan_suspend); -static void play_delayed(struct usb_serial_port *port) +static int play_delayed(struct usb_serial_port *port) { struct usb_wwan_intf_private *data; struct usb_wwan_port_private *portdata; struct urb *urb; - int err; + int err = 0; portdata = usb_get_serial_port_data(port); data = port->serial->private; @@ -641,6 +641,8 @@ static void play_delayed(struct usb_seri break; } } + + return err; } int usb_wwan_resume(struct usb_serial *serial) @@ -650,7 +652,8 @@ int usb_wwan_resume(struct usb_serial *s struct usb_wwan_intf_private *intfdata = serial->private; struct usb_wwan_port_private *portdata; struct urb *urb; - int err = 0; + int err; + int err_count = 0; spin_lock_irq(&intfdata->susp_lock); for (i = 0; i < serial->num_ports; i++) { @@ -669,25 +672,31 @@ int usb_wwan_resume(struct usb_serial *s dev_err(&port->dev, "%s: submit int urb failed: %d\n", __func__, err); + err_count++; } } + err = play_delayed(port); + if (err) + err_count++; + for (j = 0; j < N_IN_URB; j++) { urb = portdata->in_urbs[j]; err = usb_submit_urb(urb, GFP_ATOMIC); if (err < 0) { dev_err(&port->dev, "%s: Error %d for bulk URB %d\n", __func__, err, i); - spin_unlock_irq(&intfdata->susp_lock); - goto err_out; + err_count++; } } - play_delayed(port); } intfdata->suspended = 0; spin_unlock_irq(&intfdata->susp_lock); -err_out: - return err; + + if (err_count) + return -EIO; + + return 0; } EXPORT_SYMBOL(usb_wwan_resume); #endif -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/