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b43: do not stack-allocate pio rx/tx header and tail buffers
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The DMA-API debugging facility complains about b43 mapping memory from
stack for SDIO-based cards.

Indeed, b43 currently allocates the PIO RX/TX header and tail buffers
from stack. The solution here is to use heap-allocated buffers instead.

Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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Albert Herranz authored and John W. Linville committed Oct 7, 2009
1 parent f5b4da2 commit 7e937c6
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Showing 3 changed files with 132 additions and 116 deletions.
168 changes: 92 additions & 76 deletions drivers/net/wireless/b43/b43.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -607,82 +607,7 @@ struct b43_qos_params {
struct ieee80211_tx_queue_params p;
};

struct b43_wldev;

/* Data structure for the WLAN parts (802.11 cores) of the b43 chip. */
struct b43_wl {
/* Pointer to the active wireless device on this chip */
struct b43_wldev *current_dev;
/* Pointer to the ieee80211 hardware data structure */
struct ieee80211_hw *hw;

/* Global driver mutex. Every operation must run with this mutex locked. */
struct mutex mutex;
/* Hard-IRQ spinlock. This lock protects things used in the hard-IRQ
* handler, only. This basically is just the IRQ mask register. */
spinlock_t hardirq_lock;

/* The number of queues that were registered with the mac80211 subsystem
* initially. This is a backup copy of hw->queues in case hw->queues has
* to be dynamically lowered at runtime (Firmware does not support QoS).
* hw->queues has to be restored to the original value before unregistering
* from the mac80211 subsystem. */
u16 mac80211_initially_registered_queues;

/* We can only have one operating interface (802.11 core)
* at a time. General information about this interface follows.
*/

struct ieee80211_vif *vif;
/* The MAC address of the operating interface. */
u8 mac_addr[ETH_ALEN];
/* Current BSSID */
u8 bssid[ETH_ALEN];
/* Interface type. (NL80211_IFTYPE_XXX) */
int if_type;
/* Is the card operating in AP, STA or IBSS mode? */
bool operating;
/* filter flags */
unsigned int filter_flags;
/* Stats about the wireless interface */
struct ieee80211_low_level_stats ieee_stats;

#ifdef CONFIG_B43_HWRNG
struct hwrng rng;
bool rng_initialized;
char rng_name[30 + 1];
#endif /* CONFIG_B43_HWRNG */

/* List of all wireless devices on this chip */
struct list_head devlist;
u8 nr_devs;

bool radiotap_enabled;
bool radio_enabled;

/* The beacon we are currently using (AP or IBSS mode). */
struct sk_buff *current_beacon;
bool beacon0_uploaded;
bool beacon1_uploaded;
bool beacon_templates_virgin; /* Never wrote the templates? */
struct work_struct beacon_update_trigger;

/* The current QOS parameters for the 4 queues. */
struct b43_qos_params qos_params[4];

/* Work for adjustment of the transmission power.
* This is scheduled when we determine that the actual TX output
* power doesn't match what we want. */
struct work_struct txpower_adjust_work;

/* Packet transmit work */
struct work_struct tx_work;
/* Queue of packets to be transmitted. */
struct sk_buff_head tx_queue;

/* The device LEDs. */
struct b43_leds leds;
};
struct b43_wl;

/* The type of the firmware file. */
enum b43_firmware_file_type {
Expand Down Expand Up @@ -824,6 +749,97 @@ struct b43_wldev {
#endif
};

/*
* Include goes here to avoid a dependency problem.
* A better fix would be to integrate xmit.h into b43.h.
*/
#include "xmit.h"

/* Data structure for the WLAN parts (802.11 cores) of the b43 chip. */
struct b43_wl {
/* Pointer to the active wireless device on this chip */
struct b43_wldev *current_dev;
/* Pointer to the ieee80211 hardware data structure */
struct ieee80211_hw *hw;

/* Global driver mutex. Every operation must run with this mutex locked. */
struct mutex mutex;
/* Hard-IRQ spinlock. This lock protects things used in the hard-IRQ
* handler, only. This basically is just the IRQ mask register. */
spinlock_t hardirq_lock;

/* The number of queues that were registered with the mac80211 subsystem
* initially. This is a backup copy of hw->queues in case hw->queues has
* to be dynamically lowered at runtime (Firmware does not support QoS).
* hw->queues has to be restored to the original value before unregistering
* from the mac80211 subsystem. */
u16 mac80211_initially_registered_queues;

/* We can only have one operating interface (802.11 core)
* at a time. General information about this interface follows.
*/

struct ieee80211_vif *vif;
/* The MAC address of the operating interface. */
u8 mac_addr[ETH_ALEN];
/* Current BSSID */
u8 bssid[ETH_ALEN];
/* Interface type. (NL80211_IFTYPE_XXX) */
int if_type;
/* Is the card operating in AP, STA or IBSS mode? */
bool operating;
/* filter flags */
unsigned int filter_flags;
/* Stats about the wireless interface */
struct ieee80211_low_level_stats ieee_stats;

#ifdef CONFIG_B43_HWRNG
struct hwrng rng;
bool rng_initialized;
char rng_name[30 + 1];
#endif /* CONFIG_B43_HWRNG */

/* List of all wireless devices on this chip */
struct list_head devlist;
u8 nr_devs;

bool radiotap_enabled;
bool radio_enabled;

/* The beacon we are currently using (AP or IBSS mode). */
struct sk_buff *current_beacon;
bool beacon0_uploaded;
bool beacon1_uploaded;
bool beacon_templates_virgin; /* Never wrote the templates? */
struct work_struct beacon_update_trigger;

/* The current QOS parameters for the 4 queues. */
struct b43_qos_params qos_params[4];

/* Work for adjustment of the transmission power.
* This is scheduled when we determine that the actual TX output
* power doesn't match what we want. */
struct work_struct txpower_adjust_work;

/* Packet transmit work */
struct work_struct tx_work;
/* Queue of packets to be transmitted. */
struct sk_buff_head tx_queue;

/* The device LEDs. */
struct b43_leds leds;

#ifdef CONFIG_B43_PIO
/*
* RX/TX header/tail buffers used by the frame transmit functions.
*/
struct b43_rxhdr_fw4 rxhdr;
struct b43_txhdr txhdr;
u8 rx_tail[4];
u8 tx_tail[4];
#endif /* CONFIG_B43_PIO */
};

static inline struct b43_wl *hw_to_b43_wl(struct ieee80211_hw *hw)
{
return hw->priv;
Expand Down
78 changes: 39 additions & 39 deletions drivers/net/wireless/b43/pio.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -331,6 +331,7 @@ static u16 tx_write_2byte_queue(struct b43_pio_txqueue *q,
unsigned int data_len)
{
struct b43_wldev *dev = q->dev;
struct b43_wl *wl = dev->wl;
const u8 *data = _data;

ctl |= B43_PIO_TXCTL_WRITELO | B43_PIO_TXCTL_WRITEHI;
Expand All @@ -340,13 +341,12 @@ static u16 tx_write_2byte_queue(struct b43_pio_txqueue *q,
q->mmio_base + B43_PIO_TXDATA,
sizeof(u16));
if (data_len & 1) {
u8 tail[2] = { 0, };

/* Write the last byte. */
ctl &= ~B43_PIO_TXCTL_WRITEHI;
b43_piotx_write16(q, B43_PIO_TXCTL, ctl);
tail[0] = data[data_len - 1];
ssb_block_write(dev->dev, tail, 2,
wl->tx_tail[0] = data[data_len - 1];
wl->tx_tail[1] = 0;
ssb_block_write(dev->dev, wl->tx_tail, 2,
q->mmio_base + B43_PIO_TXDATA,
sizeof(u16));
}
Expand Down Expand Up @@ -381,6 +381,7 @@ static u32 tx_write_4byte_queue(struct b43_pio_txqueue *q,
unsigned int data_len)
{
struct b43_wldev *dev = q->dev;
struct b43_wl *wl = dev->wl;
const u8 *data = _data;

ctl |= B43_PIO8_TXCTL_0_7 | B43_PIO8_TXCTL_8_15 |
Expand All @@ -391,29 +392,31 @@ static u32 tx_write_4byte_queue(struct b43_pio_txqueue *q,
q->mmio_base + B43_PIO8_TXDATA,
sizeof(u32));
if (data_len & 3) {
u8 tail[4] = { 0, };

wl->tx_tail[3] = 0;
/* Write the last few bytes. */
ctl &= ~(B43_PIO8_TXCTL_8_15 | B43_PIO8_TXCTL_16_23 |
B43_PIO8_TXCTL_24_31);
switch (data_len & 3) {
case 3:
ctl |= B43_PIO8_TXCTL_16_23 | B43_PIO8_TXCTL_8_15;
tail[0] = data[data_len - 3];
tail[1] = data[data_len - 2];
tail[2] = data[data_len - 1];
wl->tx_tail[0] = data[data_len - 3];
wl->tx_tail[1] = data[data_len - 2];
wl->tx_tail[2] = data[data_len - 1];
break;
case 2:
ctl |= B43_PIO8_TXCTL_8_15;
tail[0] = data[data_len - 2];
tail[1] = data[data_len - 1];
wl->tx_tail[0] = data[data_len - 2];
wl->tx_tail[1] = data[data_len - 1];
wl->tx_tail[2] = 0;
break;
case 1:
tail[0] = data[data_len - 1];
wl->tx_tail[0] = data[data_len - 1];
wl->tx_tail[1] = 0;
wl->tx_tail[2] = 0;
break;
}
b43_piotx_write32(q, B43_PIO8_TXCTL, ctl);
ssb_block_write(dev->dev, tail, 4,
ssb_block_write(dev->dev, wl->tx_tail, 4,
q->mmio_base + B43_PIO8_TXDATA,
sizeof(u32));
}
Expand Down Expand Up @@ -445,8 +448,9 @@ static void pio_tx_frame_4byte_queue(struct b43_pio_txpacket *pack,
static int pio_tx_frame(struct b43_pio_txqueue *q,
struct sk_buff *skb)
{
struct b43_wldev *dev = q->dev;
struct b43_wl *wl = dev->wl;
struct b43_pio_txpacket *pack;
struct b43_txhdr txhdr;
u16 cookie;
int err;
unsigned int hdrlen;
Expand All @@ -457,24 +461,24 @@ static int pio_tx_frame(struct b43_pio_txqueue *q,
struct b43_pio_txpacket, list);

cookie = generate_cookie(q, pack);
hdrlen = b43_txhdr_size(q->dev);
err = b43_generate_txhdr(q->dev, (u8 *)&txhdr, skb,
hdrlen = b43_txhdr_size(dev);
err = b43_generate_txhdr(dev, (u8 *)&wl->txhdr, skb,
info, cookie);
if (err)
return err;

if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
/* Tell the firmware about the cookie of the last
* mcast frame, so it can clear the more-data bit in it. */
b43_shm_write16(q->dev, B43_SHM_SHARED,
b43_shm_write16(dev, B43_SHM_SHARED,
B43_SHM_SH_MCASTCOOKIE, cookie);
}

pack->skb = skb;
if (q->rev >= 8)
pio_tx_frame_4byte_queue(pack, (const u8 *)&txhdr, hdrlen);
pio_tx_frame_4byte_queue(pack, (const u8 *)&wl->txhdr, hdrlen);
else
pio_tx_frame_2byte_queue(pack, (const u8 *)&txhdr, hdrlen);
pio_tx_frame_2byte_queue(pack, (const u8 *)&wl->txhdr, hdrlen);

/* Remove it from the list of available packet slots.
* It will be put back when we receive the status report. */
Expand Down Expand Up @@ -614,14 +618,14 @@ void b43_pio_get_tx_stats(struct b43_wldev *dev,
static bool pio_rx_frame(struct b43_pio_rxqueue *q)
{
struct b43_wldev *dev = q->dev;
struct b43_rxhdr_fw4 rxhdr;
struct b43_wl *wl = dev->wl;
u16 len;
u32 macstat;
unsigned int i, padding;
struct sk_buff *skb;
const char *err_msg = NULL;

memset(&rxhdr, 0, sizeof(rxhdr));
memset(&wl->rxhdr, 0, sizeof(wl->rxhdr));

/* Check if we have data and wait for it to get ready. */
if (q->rev >= 8) {
Expand Down Expand Up @@ -659,16 +663,16 @@ static bool pio_rx_frame(struct b43_pio_rxqueue *q)

/* Get the preamble (RX header) */
if (q->rev >= 8) {
ssb_block_read(dev->dev, &rxhdr, sizeof(rxhdr),
ssb_block_read(dev->dev, &wl->rxhdr, sizeof(wl->rxhdr),
q->mmio_base + B43_PIO8_RXDATA,
sizeof(u32));
} else {
ssb_block_read(dev->dev, &rxhdr, sizeof(rxhdr),
ssb_block_read(dev->dev, &wl->rxhdr, sizeof(wl->rxhdr),
q->mmio_base + B43_PIO_RXDATA,
sizeof(u16));
}
/* Sanity checks. */
len = le16_to_cpu(rxhdr.frame_len);
len = le16_to_cpu(wl->rxhdr.frame_len);
if (unlikely(len > 0x700)) {
err_msg = "len > 0x700";
goto rx_error;
Expand All @@ -678,7 +682,7 @@ static bool pio_rx_frame(struct b43_pio_rxqueue *q)
goto rx_error;
}

macstat = le32_to_cpu(rxhdr.mac_status);
macstat = le32_to_cpu(wl->rxhdr.mac_status);
if (macstat & B43_RX_MAC_FCSERR) {
if (!(q->dev->wl->filter_flags & FIF_FCSFAIL)) {
/* Drop frames with failed FCS. */
Expand All @@ -703,24 +707,22 @@ static bool pio_rx_frame(struct b43_pio_rxqueue *q)
q->mmio_base + B43_PIO8_RXDATA,
sizeof(u32));
if (len & 3) {
u8 tail[4] = { 0, };

/* Read the last few bytes. */
ssb_block_read(dev->dev, tail, 4,
ssb_block_read(dev->dev, wl->rx_tail, 4,
q->mmio_base + B43_PIO8_RXDATA,
sizeof(u32));
switch (len & 3) {
case 3:
skb->data[len + padding - 3] = tail[0];
skb->data[len + padding - 2] = tail[1];
skb->data[len + padding - 1] = tail[2];
skb->data[len + padding - 3] = wl->rx_tail[0];
skb->data[len + padding - 2] = wl->rx_tail[1];
skb->data[len + padding - 1] = wl->rx_tail[2];
break;
case 2:
skb->data[len + padding - 2] = tail[0];
skb->data[len + padding - 1] = tail[1];
skb->data[len + padding - 2] = wl->rx_tail[0];
skb->data[len + padding - 1] = wl->rx_tail[1];
break;
case 1:
skb->data[len + padding - 1] = tail[0];
skb->data[len + padding - 1] = wl->rx_tail[0];
break;
}
}
Expand All @@ -729,17 +731,15 @@ static bool pio_rx_frame(struct b43_pio_rxqueue *q)
q->mmio_base + B43_PIO_RXDATA,
sizeof(u16));
if (len & 1) {
u8 tail[2] = { 0, };

/* Read the last byte. */
ssb_block_read(dev->dev, tail, 2,
ssb_block_read(dev->dev, wl->rx_tail, 2,
q->mmio_base + B43_PIO_RXDATA,
sizeof(u16));
skb->data[len + padding - 1] = tail[0];
skb->data[len + padding - 1] = wl->rx_tail[0];
}
}

b43_rx(q->dev, skb, &rxhdr);
b43_rx(q->dev, skb, &wl->rxhdr);

return 1;

Expand Down
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