diff options
| author | Ganapathi Bhat <gbhat@marvell.com> | 2018-06-01 16:11:20 +0530 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2018-06-24 20:00:46 +0300 |
| commit | f8c095f679625a26efc7bb1b8c4b3c6fcaef4633 (patch) | |
| tree | 1586506d11251296a276d3dbf75939095d1208ba /drivers/net/wireless/marvell | |
| parent | 7e58e741c001813c02cab17720835d56398f9ffc (diff) | |
mwifiex: handle race during mwifiex_usb_disconnect
Race condition is observed during rmmod of mwifiex_usb:
1. The rmmod thread will call mwifiex_usb_disconnect(), download
SHUTDOWN command and do wait_event_interruptible_timeout(),
waiting for response.
2. The main thread will handle the response and will do a
wake_up_interruptible(), unblocking rmmod thread.
3. On getting unblocked, rmmod thread will make rx_cmd.urb = NULL in
mwifiex_usb_free().
4. The main thread will try to resubmit rx_cmd.urb in
mwifiex_usb_submit_rx_urb(), which is NULL.
To fix this, move mwifiex_usb_free() from mwifiex_usb_disconnect
to mwifiex_unregister_dev(). Function mwifiex_unregister_dev() is
called after flushing the command and RX work queues.
Suggested-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Ganapathi Bhat <gbhat@marvell.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Diffstat (limited to 'drivers/net/wireless/marvell')
| -rw-r--r-- | drivers/net/wireless/marvell/mwifiex/usb.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/wireless/marvell/mwifiex/usb.c b/drivers/net/wireless/marvell/mwifiex/usb.c index bc475b83bb15..88f4c89f89ba 100644 --- a/drivers/net/wireless/marvell/mwifiex/usb.c +++ b/drivers/net/wireless/marvell/mwifiex/usb.c @@ -644,8 +644,6 @@ static void mwifiex_usb_disconnect(struct usb_interface *intf) MWIFIEX_FUNC_SHUTDOWN); } - mwifiex_usb_free(card); - mwifiex_dbg(adapter, FATAL, "%s: removing card\n", __func__); mwifiex_remove_card(adapter); @@ -1353,6 +1351,8 @@ static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter) { struct usb_card_rec *card = (struct usb_card_rec *)adapter->card; + mwifiex_usb_free(card); + mwifiex_usb_cleanup_tx_aggr(adapter); card->adapter = NULL; |