redonkable/alistair23-linux
redonkable/alistair23-linux
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rt2x00: Introduce extra queue entry sanity flag

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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>
This commit is contained in:
Ivo van Doorn 2010-12-13 12:36:18 +01:00 committed by John W. Linville
parent 64e7d72384
commit dba5dc1ae9
3 changed files with 14 additions and 5 deletions
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1
drivers/net/wireless/rt2x00/rt2x00dev.c
View file

@ -235,6 +235,7 @@ EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
void rt2x00lib_dmadone(struct queue_entry *entry)
{
set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
rt2x00queue_index_inc(entry->queue, Q_INDEX_DMA_DONE);
}

6
drivers/net/wireless/rt2x00/rt2x00queue.h
View file

@ -340,12 +340,16 @@ struct txentry_desc {
* @ENTRY_DATA_IO_FAILED: Hardware indicated that an IO error occured
* while transfering the data to the hardware. No TX status report will
* be expected from the hardware.
* @ENTRY_DATA_STATUS_PENDING: The entry has been send to the device and
* returned. It is now waiting for the status reporting before the
* entry can be reused again.
*/
enum queue_entry_flags {
ENTRY_BCN_ASSIGNED,
ENTRY_OWNER_DEVICE_DATA,
ENTRY_DATA_PENDING,
ENTRY_DATA_IO_FAILED
ENTRY_DATA_IO_FAILED,
ENTRY_DATA_STATUS_PENDING,
};
/**

12
drivers/net/wireless/rt2x00/rt2x00usb.c
View file

@ -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);