diff options
| author | Ivo van Doorn <ivdoorn@gmail.com> | 2010-12-13 12:36:18 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-12-13 15:23:36 -0500 |
| commit | dba5dc1ae9764902f46d5225c9ff40e4f7b614c7 (patch) | |
| tree | 693be19fa299bad11310e394fb06c0d4effb898b /drivers/net/wireless/rt2x00/rt2x00usb.c | |
| parent | 64e7d72384c2ecef5a892b2243623af265dd83cc (diff) | |
rt2x00: Introduce extra queue entry sanity flag
Add a queue entry flag ENTRY_DATA_STATUS_PENDING,
which can be used to indicate a queue entry has
returned from the hardware and is waiting for
status processing. Using this flag we can add
some extra sanity checks to prevent queue corruption.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00usb.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00usb.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c index cd29ebc8a37b..8a16b5106a33 100644 --- a/drivers/net/wireless/rt2x00/rt2x00usb.c +++ b/drivers/net/wireless/rt2x00/rt2x00usb.c @@ -195,7 +195,8 @@ static void rt2x00usb_work_txdone(struct work_struct *work) while (!rt2x00queue_empty(queue)) { entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE); - if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) + if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) || + !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags)) break; rt2x00usb_work_txdone_entry(entry); @@ -237,7 +238,8 @@ static void rt2x00usb_kick_tx_entry(struct queue_entry *entry) u32 length; int status; - if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags)) + if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) || + test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags)) return; /* @@ -275,7 +277,8 @@ static void rt2x00usb_work_rxdone(struct work_struct *work) while (!rt2x00queue_empty(rt2x00dev->rx)) { entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE); - if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) + if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) || + !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags)) break; /* @@ -327,7 +330,8 @@ static void rt2x00usb_kick_rx_entry(struct queue_entry *entry) struct queue_entry_priv_usb *entry_priv = entry->priv_data; int status; - if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) + if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) || + test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags)) return; rt2x00lib_dmastart(entry); |