This is a note to let you know that I've just added the patch titled
rt2x00: fix hang when unplugging USB device in use
to the 2.6.37-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rt2x00-fix-hang-when-unplugging-usb-device-in-use.patch
and it can be found in the queue-2.6.37 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From d7bb5f845f437662296adbfeaab8fbfce1c32289 Mon Sep 17 00:00:00 2001
From: Johannes Stezenbach <[email protected]>
Date: Mon, 13 Dec 2010 12:32:49 +0100
Subject: rt2x00: fix hang when unplugging USB device in use
From: Johannes Stezenbach <[email protected]>
commit d7bb5f845f437662296adbfeaab8fbfce1c32289 upstream.
When an rt2x00 USB device is unplugged while in use, it reliably
hangs the whole system. After some time the watchdog prints:
BUG: soft lockup - CPU#0 stuck for 64s! [kworker/u:0:5]
...
[<c01a88d8>] (usb_submit_urb+0x0/0x2ac) from [<bf0e752c>]
(rt2x00usb_kick_rx_entry+0xb4/0xe8 [rt2x00usb])
[<bf0e7478>] (rt2x00usb_kick_rx_entry+0x0/0xe8 [rt2x00usb]) from [<bf0e7588>]
(rt2x00usb_clear_entry+x28/0x2c [rt2x00usb])
[<bf0e7560>] (rt2x00usb_clear_entry+0x0/0x2c [rt2x00usb]) from [<bf0d5bc4>]
(rt2x00lib_rxdone+0x2e0/0x2f8 [rt2x00lib])
[<bf0d58e4>] (rt2x00lib_rxdone+0x0/0x2f8 [rt2x00lib]) from [<bf0e7e00>]
(rt2x00usb_work_rxdone+0x54/0x74 [rt2x00usb])
[<bf0e7dac>] (rt2x00usb_work_rxdone+0x0/0x74 [rt2x00usb]) from [<c00542b4>]
(process_one_work+0x20c/0x35c)
Clear the DEVICE_STATE_PRESENT flag when usb_submit_urb()
returns -ENODEV to fix this.
Signed-off-by: Johannes Stezenbach <[email protected]>
Signed-off-by: Ivo van Doorn <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/wireless/rt2x00/rt2x00usb.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -235,6 +235,7 @@ static void rt2x00usb_kick_tx_entry(stru
struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
struct queue_entry_priv_usb *entry_priv = entry->priv_data;
u32 length;
+ int status;
if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
return;
@@ -251,7 +252,10 @@ static void rt2x00usb_kick_tx_entry(stru
entry->skb->data, length,
rt2x00usb_interrupt_txdone, entry);
- if (usb_submit_urb(entry_priv->urb, GFP_ATOMIC)) {
+ status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
+ if (status) {
+ if (status == -ENODEV)
+ clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
rt2x00lib_dmadone(entry);
}
@@ -450,6 +454,7 @@ void rt2x00usb_clear_entry(struct queue_
to_usb_device_intf(entry->queue->rt2x00dev->dev);
struct queue_entry_priv_usb *entry_priv = entry->priv_data;
int pipe;
+ int status;
entry->flags = 0;
@@ -460,7 +465,12 @@ void rt2x00usb_clear_entry(struct queue_
rt2x00usb_interrupt_rxdone, entry);
set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
- if (usb_submit_urb(entry_priv->urb, GFP_ATOMIC)) {
+
+ status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
+ if (status) {
+ if (status == -ENODEV)
+ clear_bit(DEVICE_STATE_PRESENT,
+ &entry->queue->rt2x00dev->flags);
set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
rt2x00lib_dmadone(entry);
}
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.37/rt2x00-fix-hang-when-unplugging-usb-device-in-use.patch
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