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| author | Ben Hutchings <bhutchings@solarflare.com> | 2013-08-27 23:04:29 +0100 |
|---|---|---|
| committer | Ben Hutchings <bhutchings@solarflare.com> | 2013-08-29 18:12:04 +0100 |
| commit | 251111d9a1bd9a26e25446d876156bf265858cb5 (patch) | |
| tree | 7e4a93373f504f199e8542d772c3fe10f6f3cd70 /drivers/net/ethernet/sfc/mcdi.c | |
| parent | 2f4bcdcca796ca7d385e3f870e552a2d85f0a7c9 (diff) | |
| download | linux-251111d9a1bd9a26e25446d876156bf265858cb5.tar.gz linux-251111d9a1bd9a26e25446d876156bf265858cb5.tar.bz2 linux-251111d9a1bd9a26e25446d876156bf265858cb5.zip | |
sfc: Remove unnecessary use of atomic_t
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>
Diffstat (limited to 'drivers/net/ethernet/sfc/mcdi.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/mcdi.c | 28 |
1 files changed, 12 insertions, 16 deletions
diff --git a/drivers/net/ethernet/sfc/mcdi.c b/drivers/net/ethernet/sfc/mcdi.c index 89bc194a55f7..c616fb52d1d5 100644 --- a/drivers/net/ethernet/sfc/mcdi.c +++ b/drivers/net/ethernet/sfc/mcdi.c @@ -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); } |