This commit replace current custom implementation of some circular
buffer head and tail logic in favour of the use of macros defined
in linux circ_buf.h header. It also review internal names and adds
a new CIRC_INC macro to make code more readable. Note also that
CIRC_INC does not need to go inside do-while(0) block because its
use is only located in the four functions that make use of it
so it won't expand into invalid code at all.
Signed-off-by: Sergio Paracuellos <sergio.paracuel...@gmail.com>
---
drivers/staging/ks7010/ks7010_sdio.c | 59 ++++++++++++++++++++++--------------
1 file changed, 36 insertions(+), 23 deletions(-)
diff --git a/drivers/staging/ks7010/ks7010_sdio.c
b/drivers/staging/ks7010/ks7010_sdio.c
index 9c591e0..9676902 100644
--- a/drivers/staging/ks7010/ks7010_sdio.c
+++ b/drivers/staging/ks7010/ks7010_sdio.c
@@ -10,6 +10,7 @@
* published by the Free Software Foundation.
*/
+#include <linux/circ_buf.h>
#include <linux/firmware.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio_func.h>
@@ -101,38 +102,50 @@ enum gen_com_reg_b {
#define KS7010_IO_BLOCK_SIZE 512
+#define CIRC_INC(a, b) if (++a >= b) a = 0
+
static inline void inc_txqhead(struct ks_wlan_private *priv)
{
- priv->tx_dev.qhead = (priv->tx_dev.qhead + 1) % TX_DEVICE_BUFF_SIZE;
+ CIRC_INC(priv->tx_dev.qhead, TX_DEVICE_BUFF_SIZE);
}
static inline void inc_txqtail(struct ks_wlan_private *priv)
{
- priv->tx_dev.qtail = (priv->tx_dev.qtail + 1) % TX_DEVICE_BUFF_SIZE;
+ CIRC_INC(priv->tx_dev.qtail, TX_DEVICE_BUFF_SIZE);
}
-static inline unsigned int cnt_txqbody(struct ks_wlan_private *priv)
+static inline bool txq_has_space(struct ks_wlan_private *priv)
{
- unsigned int tx_cnt = priv->tx_dev.qtail - priv->tx_dev.qhead;
-
- return (tx_cnt + TX_DEVICE_BUFF_SIZE) % TX_DEVICE_BUFF_SIZE;
+ return (CIRC_SPACE(priv->tx_dev.qhead, priv->tx_dev.qtail,
+ TX_DEVICE_BUFF_SIZE) > 0);
}
static inline void inc_rxqhead(struct ks_wlan_private *priv)
{
- priv->rx_dev.qhead = (priv->rx_dev.qhead + 1) % RX_DEVICE_BUFF_SIZE;
+ CIRC_INC(priv->rx_dev.qhead, RX_DEVICE_BUFF_SIZE);
}
static inline void inc_rxqtail(struct ks_wlan_private *priv)
{
- priv->rx_dev.qtail = (priv->rx_dev.qtail + 1) % RX_DEVICE_BUFF_SIZE;
+ CIRC_INC(priv->rx_dev.qtail, RX_DEVICE_BUFF_SIZE);
}
-static inline unsigned int cnt_rxqbody(struct ks_wlan_private *priv)
+static inline bool rxq_has_space(struct ks_wlan_private *priv)
{
- unsigned int rx_cnt = priv->rx_dev.qtail - priv->rx_dev.qhead;
+ return (CIRC_SPACE(priv->rx_dev.qhead, priv->rx_dev.qtail,
+ RX_DEVICE_BUFF_SIZE) > 0);
+}
- return (rx_cnt + RX_DEVICE_BUFF_SIZE) % RX_DEVICE_BUFF_SIZE;
+static inline unsigned int txq_count(struct ks_wlan_private *priv)
+{
+ return CIRC_CNT_TO_END(priv->tx_dev.qhead, priv->tx_dev.qtail,
+ TX_DEVICE_BUFF_SIZE);
+}
+
+static inline unsigned int rxq_count(struct ks_wlan_private *priv)
+{
+ return CIRC_CNT_TO_END(priv->rx_dev.qhead, priv->rx_dev.qtail,
+ RX_DEVICE_BUFF_SIZE);
}
/* Read single byte from device address into byte (CMD52) */
@@ -258,11 +271,11 @@ static void _ks_wlan_hw_power_save(struct ks_wlan_private
*priv)
atomic_read(&priv->psstatus.status),
atomic_read(&priv->psstatus.confirm_wait),
atomic_read(&priv->psstatus.snooze_guard),
- cnt_txqbody(priv));
+ txq_count(priv));
if (atomic_read(&priv->psstatus.confirm_wait) ||
atomic_read(&priv->psstatus.snooze_guard) ||
- cnt_txqbody(priv)) {
+ txq_has_space(priv)) {
queue_delayed_work(priv->wq, &priv->rw_dwork, 0);
return;
}
@@ -308,7 +321,7 @@ static int enqueue_txdev(struct ks_wlan_private *priv,
unsigned char *p,
goto err_complete;
}
- if ((TX_DEVICE_BUFF_SIZE - 1) <= cnt_txqbody(priv)) {
+ if ((TX_DEVICE_BUFF_SIZE - 1) <= txq_count(priv)) {
netdev_err(priv->net_dev, "tx buffer overflow\n");
ret = -EOVERFLOW;
goto err_complete;
@@ -366,7 +379,7 @@ static void tx_device_task(struct ks_wlan_private *priv)
struct tx_device_buffer *sp;
int ret;
- if (cnt_txqbody(priv) <= 0 ||
+ if (!txq_has_space(priv) ||
atomic_read(&priv->psstatus.status) == PS_SNOOZE)
return;
@@ -385,7 +398,7 @@ static void tx_device_task(struct ks_wlan_private *priv)
(*sp->complete_handler)(priv, sp->skb);
inc_txqhead(priv);
- if (cnt_txqbody(priv) > 0)
+ if (txq_has_space(priv))
queue_delayed_work(priv->wq, &priv->rw_dwork, 0);
}
@@ -413,7 +426,7 @@ int ks_wlan_hw_tx(struct ks_wlan_private *priv, void *p,
unsigned long size,
result = enqueue_txdev(priv, p, size, complete_handler, skb);
spin_unlock(&priv->tx_dev.tx_dev_lock);
- if (cnt_txqbody(priv) > 0)
+ if (txq_has_space(priv))
queue_delayed_work(priv->wq, &priv->rw_dwork, 0);
return result;
@@ -424,12 +437,12 @@ static void rx_event_task(unsigned long dev)
struct ks_wlan_private *priv = (struct ks_wlan_private *)dev;
struct rx_device_buffer *rp;
- if (cnt_rxqbody(priv) > 0 && priv->dev_state >= DEVICE_STATE_BOOT) {
+ if (rxq_has_space(priv) && priv->dev_state >= DEVICE_STATE_BOOT) {
rp = &priv->rx_dev.rx_dev_buff[priv->rx_dev.qhead];
hostif_receive(priv, rp->data, rp->size);
inc_rxqhead(priv);
- if (cnt_rxqbody(priv) > 0)
+ if (rxq_has_space(priv))
tasklet_schedule(&priv->rx_bh_task);
}
}
@@ -442,7 +455,7 @@ static void ks_wlan_hw_rx(struct ks_wlan_private *priv,
uint16_t size)
unsigned short event = 0;
/* receive data */
- if (cnt_rxqbody(priv) >= (RX_DEVICE_BUFF_SIZE - 1)) {
+ if (rxq_count(priv) >= (RX_DEVICE_BUFF_SIZE - 1)) {
netdev_err(priv->net_dev, "rx buffer overflow\n");
return;
}
@@ -513,7 +526,7 @@ static void ks7010_rw_function(struct work_struct *work)
/* power save wakeup */
if (atomic_read(&priv->psstatus.status) == PS_SNOOZE) {
- if (cnt_txqbody(priv) > 0) {
+ if (txq_has_space(priv)) {
ks_wlan_hw_wakeup_request(priv);
queue_delayed_work(priv->wq, &priv->rw_dwork, 1);
}
@@ -604,7 +617,7 @@ static void ks_sdio_interrupt(struct sdio_func *func)
if (byte & WSTATUS_MASK) {
if (atomic_read(&priv->psstatus.status) == PS_SNOOZE) {
- if (cnt_txqbody(priv)) {
+ if (txq_has_space(priv)) {
ks_wlan_hw_wakeup_request(priv);
queue_delayed_work(priv->wq,
&priv->rw_dwork, 1);
@@ -641,7 +654,7 @@ static void trx_device_exit(struct ks_wlan_private *priv)
struct tx_device_buffer *sp;
/* tx buffer clear */
- while (cnt_txqbody(priv) > 0) {
+ while (txq_has_space(priv)) {
sp = &priv->tx_dev.tx_dev_buff[priv->tx_dev.qhead];
kfree(sp->sendp);
if (sp->complete_handler) /* TX Complete */
--
2.7.4
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