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at86rf230: remove unnecessary spinlock 

This spinlock isn't necessary because if we are in TX_ON/TX_ARET_ON
state the transceiver can't be interrupted e.g. by receiving a frame
when a SHR was detected. In this time the transceiver doesn't leave
the TX_ON/TX_ARET_ON state until the tx complete irq change the state
into RX_AACK_ON again. This means a receiving interrupt in state
TX_ON/TX_ARET_ON can't happen and is_tx is protected by transceiver.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2015-03-26 12:46:29 +01:00 committed by Marcel Holtmann
parent 8bf9538a5d
commit 3ff7092bc8
1 changed files with 0 additions and 9 deletions
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9
drivers/net/ieee802154/at86rf230.c
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@ -25,7 +25,6 @@
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/spi/spi.h>
#include <linux/spi/at86rf230.h>
#include <linux/regmap.h>
@ -96,8 +95,6 @@ struct at86rf230_local {
unsigned long cal_timeout;
s8 max_frame_retries;
bool is_tx;
/* spinlock for is_tx protection */
spinlock_t lock;
u8 tx_retry;
struct sk_buff *tx_skb;
struct at86rf230_state_change tx;
@ -878,10 +875,8 @@ at86rf230_rx_trac_check(void *context)
static void
at86rf230_irq_trx_end(struct at86rf230_local *lp)
{
spin_lock(&lp->lock);
if (lp->is_tx) {
lp->is_tx = 0;
spin_unlock(&lp->lock);
if (lp->tx_aret)
at86rf230_async_state_change(lp, &lp->irq,
@ -894,7 +889,6 @@ at86rf230_irq_trx_end(struct at86rf230_local *lp)
at86rf230_tx_complete,
true);
} else {
spin_unlock(&lp->lock);
at86rf230_async_read_reg(lp, RG_TRX_STATE, &lp->irq,
at86rf230_rx_trac_check, true);
}
@ -964,9 +958,7 @@ at86rf230_write_frame(void *context)
u8 *buf = ctx->buf;
int rc;
spin_lock(&lp->lock);
lp->is_tx = 1;
spin_unlock(&lp->lock);
buf[0] = CMD_FB | CMD_WRITE;
buf[1] = skb->len + 2;
@ -1698,7 +1690,6 @@ static int at86rf230_probe(struct spi_device *spi)
if (rc < 0)
goto free_dev;
spin_lock_init(&lp->lock);
init_completion(&lp->state_complete);
spi_set_drvdata(spi, lp);