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sfc: Remove unnecessary use of atomic_t

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We can set, get and compare-and-exchange without using atomic_t.
Change efx_mcdi_iface::state to the enum type we really wanted it to
be.

Suggested-by: David Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2013-08-27 23:04:29 +01:00
parent 2f4bcdcca7
commit 251111d9a1
2 changed files with 13 additions and 17 deletions
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28
drivers/net/ethernet/sfc/mcdi.c
View File

@ -8,6 +8,7 @@
*/
#include <linux/delay.h>
#include <asm/cmpxchg.h>
#include "net_driver.h"
#include "nic.h"
#include "io.h"
@ -53,7 +54,7 @@ int efx_mcdi_init(struct efx_nic *efx)
mcdi = efx_mcdi(efx);
init_waitqueue_head(&mcdi->wq);
spin_lock_init(&mcdi->iface_lock);
atomic_set(&mcdi->state, MCDI_STATE_QUIESCENT);
mcdi->state = MCDI_STATE_QUIESCENT;
mcdi->mode = MCDI_MODE_POLL;
(void) efx_mcdi_poll_reboot(efx);
@ -65,8 +66,7 @@ int efx_mcdi_init(struct efx_nic *efx)
void efx_mcdi_fini(struct efx_nic *efx)
{
BUG_ON(efx->mcdi &&
atomic_read(&efx->mcdi->iface.state) != MCDI_STATE_QUIESCENT);
BUG_ON(efx->mcdi && efx->mcdi->iface.state != MCDI_STATE_QUIESCENT);
kfree(efx->mcdi);
}
@ -78,7 +78,7 @@ static void efx_mcdi_send_request(struct efx_nic *efx, unsigned cmd,
size_t hdr_len;
u32 xflags, seqno;
BUG_ON(atomic_read(&mcdi->state) == MCDI_STATE_QUIESCENT);
BUG_ON(mcdi->state == MCDI_STATE_QUIESCENT);
/* Serialise with efx_mcdi_ev_cpl() and efx_mcdi_ev_death() */
spin_lock_bh(&mcdi->iface_lock);
@ -258,20 +258,17 @@ static void efx_mcdi_acquire(struct efx_mcdi_iface *mcdi)
/* Wait until the interface becomes QUIESCENT and we win the race
* to mark it RUNNING. */
wait_event(mcdi->wq,
atomic_cmpxchg(&mcdi->state,
MCDI_STATE_QUIESCENT,
MCDI_STATE_RUNNING)
== MCDI_STATE_QUIESCENT);
cmpxchg(&mcdi->state,
MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING) ==
MCDI_STATE_QUIESCENT);
}
static int efx_mcdi_await_completion(struct efx_nic *efx)
{
struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
if (wait_event_timeout(
mcdi->wq,
atomic_read(&mcdi->state) == MCDI_STATE_COMPLETED,
MCDI_RPC_TIMEOUT) == 0)
if (wait_event_timeout(mcdi->wq, mcdi->state == MCDI_STATE_COMPLETED,
MCDI_RPC_TIMEOUT) == 0)
return -ETIMEDOUT;
/* Check if efx_mcdi_set_mode() switched us back to polled completions.
@ -296,9 +293,8 @@ static bool efx_mcdi_complete(struct efx_mcdi_iface *mcdi)
* QUIESCENT. [A subsequent invocation would increment seqno, so would
* have failed the seqno check].
*/
if (atomic_cmpxchg(&mcdi->state,
MCDI_STATE_RUNNING,
MCDI_STATE_COMPLETED) == MCDI_STATE_RUNNING) {
if (cmpxchg(&mcdi->state, MCDI_STATE_RUNNING, MCDI_STATE_COMPLETED) ==
MCDI_STATE_RUNNING) {
wake_up(&mcdi->wq);
return true;
}
@ -308,7 +304,7 @@ static bool efx_mcdi_complete(struct efx_mcdi_iface *mcdi)
static void efx_mcdi_release(struct efx_mcdi_iface *mcdi)
{
atomic_set(&mcdi->state, MCDI_STATE_QUIESCENT);
mcdi->state = MCDI_STATE_QUIESCENT;
wake_up(&mcdi->wq);
}

2
drivers/net/ethernet/sfc/mcdi.h
View File

@ -46,7 +46,7 @@ enum efx_mcdi_mode {
* @resp_data_len: Response data (SDU or error) length
*/
struct efx_mcdi_iface {
atomic_t state;
enum efx_mcdi_state state;
enum efx_mcdi_mode mode;
wait_queue_head_t wq;
spinlock_t iface_lock;