[PATCH 3.2 086/149] staging: vt6656: [BUG] main_usb.c oops ondevice_close move flag earlier.

From: Ben Hutchings
Date: Mon Oct 21 2013 - 05:13:03 EST


3.2.52-rc1 review patch. If anyone has any objections, please let me know.

------------------

From: Malcolm Priestley <tvboxspy@xxxxxxxxx>

commit e3eb270fab7734427dd8171a93e4946fe28674bc upstream.

The vt6656 is prone to resetting on the usb bus.

It seems there is a race condition and wpa supplicant is
trying to open the device via iw_handlers before its actually
closed at a stage that the buffers are being removed.

The device is longer considered open when the
buffers are being removed. So move ~DEVICE_FLAGS_OPENED
flag to before freeing the device buffers.

Signed-off-by: Malcolm Priestley <tvboxspy@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/staging/vt6656/main_usb.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/staging/vt6656/main_usb.c
+++ b/drivers/staging/vt6656/main_usb.c
@@ -1221,6 +1221,8 @@ device_release_WPADEV(pDevice);
memset(pMgmt->abyCurrBSSID, 0, 6);
pMgmt->eCurrState = WMAC_STATE_IDLE;

+ pDevice->flags &= ~DEVICE_FLAGS_OPENED;
+
device_free_tx_bufs(pDevice);
device_free_rx_bufs(pDevice);
device_free_int_bufs(pDevice);
@@ -1232,7 +1234,6 @@ device_release_WPADEV(pDevice);
usb_free_urb(pDevice->pInterruptURB);

BSSvClearNodeDBTable(pDevice, 0);
- pDevice->flags &=(~DEVICE_FLAGS_OPENED);

DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "device_close2 \n");


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