From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-ew0-f207.google.com ([209.85.219.207]:42724 "EHLO mail-ew0-f207.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758688AbZKETWA convert rfc822-to-8bit (ORCPT ); Thu, 5 Nov 2009 14:22:00 -0500 Received: by ewy3 with SMTP id 3so331579ewy.37 for ; Thu, 05 Nov 2009 11:22:05 -0800 (PST) From: Ivo van Doorn To: John Linville Subject: [PATCH] rt2x00: Don't queue ieee80211 work after USB removal Date: Thu, 5 Nov 2009 20:22:03 +0100 Cc: users@rt2x00.serialmonkey.com, linux-wireless@vger.kernel.org, Sean Cross MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Message-Id: <200911052022.03491.IvDoorn@gmail.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Sean Cross This prevents the rt2x00 driver from queueing ieee80211 work after the   USB card has been removed, preventing a kernel panic. Signed-off-by: Sean Cross Signed-off-by: Ivo van Doorn --- diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c index 71761b3..73bbec5 100644 --- a/drivers/net/wireless/rt2x00/rt2x00dev.c +++ b/drivers/net/wireless/rt2x00/rt2x00dev.c @@ -815,6 +815,8 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev) mutex_init(&rt2x00dev->csr_mutex); + set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); + /* * Make room for rt2x00_intf inside the per-interface * structure ieee80211_vif. @@ -871,8 +873,6 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev) rt2x00leds_register(rt2x00dev); rt2x00debug_register(rt2x00dev); - set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); - return 0; exit: diff --git a/drivers/net/wireless/rt2x00/rt2x00link.c b/drivers/net/wireless/rt2x00/rt2x00link.c index c64db0b..c708d0b 100644 --- a/drivers/net/wireless/rt2x00/rt2x00link.c +++ b/drivers/net/wireless/rt2x00/rt2x00link.c @@ -362,8 +362,9 @@ void rt2x00link_start_tuner(struct rt2x00_dev *rt2x00dev) rt2x00link_reset_tuner(rt2x00dev, false); - ieee80211_queue_delayed_work(rt2x00dev->hw, - &link->work, LINK_TUNE_INTERVAL); + if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) + ieee80211_queue_delayed_work(rt2x00dev->hw, + &link->work, LINK_TUNE_INTERVAL); } void rt2x00link_stop_tuner(struct rt2x00_dev *rt2x00dev) @@ -469,8 +470,10 @@ static void rt2x00link_tuner(struct work_struct *work) * Increase tuner counter, and reschedule the next link tuner run. */ link->count++; - ieee80211_queue_delayed_work(rt2x00dev->hw, - &link->work, LINK_TUNE_INTERVAL); + + if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) + ieee80211_queue_delayed_work(rt2x00dev->hw, + &link->work, LINK_TUNE_INTERVAL); } void rt2x00link_register(struct rt2x00_dev *rt2x00dev) diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c index 5015448..f02b48a 100644 --- a/drivers/net/wireless/rt2x00/rt2x00usb.c +++ b/drivers/net/wireless/rt2x00/rt2x00usb.c @@ -47,6 +47,8 @@ int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev, (requesttype == USB_VENDOR_REQUEST_IN) ? usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0); + if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) + return -ENODEV; for (i = 0; i < REGISTER_BUSY_COUNT; i++) { status = usb_control_msg(usb_dev, pipe, request, requesttype, @@ -60,8 +62,10 @@ int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev, * -ENODEV: Device has disappeared, no point continuing. * All other errors: Try again. */ - else if (status == -ENODEV) + else if (status == -ENODEV) { + clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); break; + } } ERROR(rt2x00dev, @@ -161,6 +165,9 @@ int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev, { unsigned int i; + if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) + return -ENODEV; + for (i = 0; i < REGISTER_BUSY_COUNT; i++) { rt2x00usb_register_read_lock(rt2x00dev, offset, reg); if (!rt2x00_get_field32(*reg, field))