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rt2x00: Move direct access to queue->entries to rt2x00queue.c

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All access to queue->entries through the Q_INDEX/Q_INDEX_DONE
variables must be done using spinlock protection. It is best
to manage this completely from rt2x00queue.c.

For safely looping through all entries in the queue, the function
rt2x00queue_for_each_entry is added which will walk from from a index
range in a safe manner.

This also fixes rt2x00usb which walked the entries list from
0 to length to kill each entry (killing entries must be done
from Q_INDEX_DONE to Q_INDEX to enforce TX status reporting to
occur in the correct order.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn 2010-08-23 19:54:21 +02:00 committed by John W. Linville
parent ee1e755f84
commit 5eb7efe8a4
4 changed files with 87 additions and 61 deletions
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4
drivers/net/wireless/rt2x00/rt2800pci.c
View file

@ -629,7 +629,7 @@ static void rt2800pci_write_tx_desc(struct queue_entry *entry,
static void rt2800pci_kick_tx_queue(struct data_queue *queue)
{
struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
unsigned int idx = queue->index[Q_INDEX];
struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
unsigned int qidx = 0;
if (queue->qid == QID_MGMT)
@ -637,7 +637,7 @@ static void rt2800pci_kick_tx_queue(struct data_queue *queue)
else
qidx = queue->qid;
rt2800_register_write(rt2x00dev, TX_CTX_IDX(qidx), idx);
rt2800_register_write(rt2x00dev, TX_CTX_IDX(qidx), entry->entry_idx);
}
static void rt2800pci_kill_tx_queue(struct data_queue *queue)

45
drivers/net/wireless/rt2x00/rt2x00queue.c
View file

@ -625,6 +625,51 @@ int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
return 0;
}
void rt2x00queue_for_each_entry(struct data_queue *queue,
enum queue_index start,
enum queue_index end,
void (*fn)(struct queue_entry *entry))
{
unsigned long irqflags;
unsigned int index_start;
unsigned int index_end;
unsigned int i;
if (unlikely(start >= Q_INDEX_MAX || end >= Q_INDEX_MAX)) {
ERROR(queue->rt2x00dev,
"Entry requested from invalid index range (%d - %d)\n",
start, end);
return;
}
/*
* Only protect the range we are going to loop over,
* if during our loop a extra entry is set to pending
* it should not be kicked during this run, since it
* is part of another TX operation.
*/
spin_lock_irqsave(&queue->lock, irqflags);
index_start = queue->index[start];
index_end = queue->index[end];
spin_unlock_irqrestore(&queue->lock, irqflags);
/*
* Start from the TX done pointer, this guarentees that we will
* send out all frames in the correct order.
*/
if (index_start < index_end) {
for (i = index_start; i < index_end; i++)
fn(&queue->entries[i]);
} else {
for (i = index_start; i < queue->limit; i++)
fn(&queue->entries[i]);
for (i = 0; i < index_end; i++)
fn(&queue->entries[i]);
}
}
EXPORT_SYMBOL_GPL(rt2x00queue_for_each_entry);
struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
const enum data_queue_qid queue)
{

16
drivers/net/wireless/rt2x00/rt2x00queue.h
View file

@ -570,6 +570,22 @@ struct data_queue_desc {
#define txall_queue_for_each(__dev, __entry) \
queue_loop(__entry, (__dev)->tx, queue_end(__dev))
/**
* rt2x00queue_for_each_entry - Loop through all entries in the queue
* @queue: Pointer to @data_queue
* @start: &enum queue_index Pointer to start index
* @end: &enum queue_index Pointer to end index
* @fn: The function to call for each &struct queue_entry
*
* This will walk through all entries in the queue, in chronological
* order. This means it will start at the current @start pointer
* and will walk through the queue until it reaches the @end pointer.
*/
void rt2x00queue_for_each_entry(struct data_queue *queue,
enum queue_index start,
enum queue_index end,
void (*fn)(struct queue_entry *entry));
/**
* rt2x00queue_empty - Check if the queue is empty.
* @queue: Queue to check if empty.

83
drivers/net/wireless/rt2x00/rt2x00usb.c
View file

@ -225,7 +225,7 @@ static void rt2x00usb_interrupt_txdone(struct urb *urb)
ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->txdone_work);
}
static inline void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
static void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
{
struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
@ -252,69 +252,34 @@ static inline void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
void rt2x00usb_kick_tx_queue(struct data_queue *queue)
{
unsigned long irqflags;
unsigned int index;
unsigned int index_done;
unsigned int i;
/*
* Only protect the range we are going to loop over,
* if during our loop a extra entry is set to pending
* it should not be kicked during this run, since it
* is part of another TX operation.
*/
spin_lock_irqsave(&queue->lock, irqflags);
index = queue->index[Q_INDEX];
index_done = queue->index[Q_INDEX_DONE];
spin_unlock_irqrestore(&queue->lock, irqflags);
/*
* Start from the TX done pointer, this guarentees that we will
* send out all frames in the correct order.
*/
if (index_done < index) {
for (i = index_done; i < index; i++)
rt2x00usb_kick_tx_entry(&queue->entries[i]);
} else {
for (i = index_done; i < queue->limit; i++)
rt2x00usb_kick_tx_entry(&queue->entries[i]);
for (i = 0; i < index; i++)
rt2x00usb_kick_tx_entry(&queue->entries[i]);
}
rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
rt2x00usb_kick_tx_entry);
}
EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
static void rt2x00usb_kill_tx_entry(struct queue_entry *entry)
{
struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
struct queue_entry_priv_usb *entry_priv = entry->priv_data;
struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
return;
usb_kill_urb(entry_priv->urb);
/*
* Kill guardian urb (if required by driver).
*/
if ((entry->queue->qid == QID_BEACON) &&
(test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)))
usb_kill_urb(bcn_priv->guardian_urb);
}
void rt2x00usb_kill_tx_queue(struct data_queue *queue)
{
struct queue_entry_priv_usb *entry_priv;
struct queue_entry_priv_usb_bcn *bcn_priv;
unsigned int i;
bool kill_guard;
/*
* When killing the beacon queue, we must also kill
* the beacon guard byte.
*/
kill_guard =
(queue->qid == QID_BEACON) &&
(test_bit(DRIVER_REQUIRE_BEACON_GUARD, &queue->rt2x00dev->flags));
/*
* Cancel all entries.
*/
for (i = 0; i < queue->limit; i++) {
entry_priv = queue->entries[i].priv_data;
usb_kill_urb(entry_priv->urb);
/*
* Kill guardian urb (if required by driver).
*/
if (kill_guard) {
bcn_priv = queue->entries[i].priv_data;
usb_kill_urb(bcn_priv->guardian_urb);
}
}
rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
rt2x00usb_kill_tx_entry);
}
EXPORT_SYMBOL_GPL(rt2x00usb_kill_tx_queue);