From: Hante Meuleman Date: Wed, 18 Mar 2015 12:25:22 +0000 (+0100) Subject: brcmfmac: Add necessary memory barriers for SDIO. X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2c64e16d1ff1228df837508ab32e8a060cb06907;p=linux-beck.git brcmfmac: Add necessary memory barriers for SDIO. SDIO uses a thread to handle all communication with the device, for this data is exchanged between threads. This data needs proper memory barriers to make sure that data "exchange" is going correct. Reviewed-by: Arend Van Spriel Reviewed-by: Franky (Zhenhui) Lin Reviewed-by: Pieter-Paul Giesberts Reviewed-by: Daniel (Deognyoun) Kim Signed-off-by: Hante Meuleman Signed-off-by: Arend van Spriel Signed-off-by: Kalle Valo --- diff --git a/drivers/net/wireless/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/brcm80211/brcmfmac/sdio.c index 17a7212cfd70..38fa0e8f859d 100644 --- a/drivers/net/wireless/brcm80211/brcmfmac/sdio.c +++ b/drivers/net/wireless/brcm80211/brcmfmac/sdio.c @@ -507,8 +507,8 @@ struct brcmf_sdio { struct workqueue_struct *brcmf_wq; struct work_struct datawork; - atomic_t dpc_tskcnt; - atomic_t dpc_running; + bool dpc_triggered; + bool dpc_running; bool txoff; /* Transmit flow-controlled */ struct brcmf_sdio_count sdcnt; @@ -2713,6 +2713,7 @@ static void brcmf_sdio_dpc(struct brcmf_sdio *bus) err = brcmf_sdio_tx_ctrlframe(bus, bus->ctrl_frame_buf, bus->ctrl_frame_len); bus->ctrl_frame_err = err; + wmb(); bus->ctrl_frame_stat = false; } sdio_release_host(bus->sdiodev->func[1]); @@ -2734,6 +2735,7 @@ static void brcmf_sdio_dpc(struct brcmf_sdio *bus) sdio_claim_host(bus->sdiodev->func[1]); if (bus->ctrl_frame_stat) { bus->ctrl_frame_err = -ENODEV; + wmb(); bus->ctrl_frame_stat = false; brcmf_sdio_wait_event_wakeup(bus); } @@ -2744,7 +2746,7 @@ static void brcmf_sdio_dpc(struct brcmf_sdio *bus) (!atomic_read(&bus->fcstate) && brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) && data_ok(bus))) { - atomic_inc(&bus->dpc_tskcnt); + bus->dpc_triggered = true; } } @@ -2940,6 +2942,7 @@ brcmf_sdio_bus_txctl(struct device *dev, unsigned char *msg, uint msglen) /* Send from dpc */ bus->ctrl_frame_buf = msg; bus->ctrl_frame_len = msglen; + wmb(); bus->ctrl_frame_stat = true; brcmf_sdio_trigger_dpc(bus); @@ -2958,6 +2961,7 @@ brcmf_sdio_bus_txctl(struct device *dev, unsigned char *msg, uint msglen) if (!ret) { brcmf_dbg(SDIO, "ctrl_frame complete, err=%d\n", bus->ctrl_frame_err); + rmb(); ret = bus->ctrl_frame_err; } @@ -3526,8 +3530,8 @@ done: void brcmf_sdio_trigger_dpc(struct brcmf_sdio *bus) { - if (atomic_read(&bus->dpc_tskcnt) == 0) { - atomic_inc(&bus->dpc_tskcnt); + if (!bus->dpc_triggered) { + bus->dpc_triggered = true; queue_work(bus->brcmf_wq, &bus->datawork); } } @@ -3558,7 +3562,7 @@ void brcmf_sdio_isr(struct brcmf_sdio *bus) if (!bus->intr) brcmf_err("isr w/o interrupt configured!\n"); - atomic_inc(&bus->dpc_tskcnt); + bus->dpc_triggered = true; queue_work(bus->brcmf_wq, &bus->datawork); } @@ -3578,7 +3582,7 @@ static void brcmf_sdio_bus_watchdog(struct brcmf_sdio *bus) if (!bus->intr || (bus->sdcnt.intrcount == bus->sdcnt.lastintrs)) { - if (atomic_read(&bus->dpc_tskcnt) == 0) { + if (!bus->dpc_triggered) { u8 devpend; sdio_claim_host(bus->sdiodev->func[1]); @@ -3596,7 +3600,7 @@ static void brcmf_sdio_bus_watchdog(struct brcmf_sdio *bus) bus->sdcnt.pollcnt++; atomic_set(&bus->ipend, 1); - atomic_inc(&bus->dpc_tskcnt); + bus->dpc_triggered = true; queue_work(bus->brcmf_wq, &bus->datawork); } } @@ -3623,17 +3627,21 @@ static void brcmf_sdio_bus_watchdog(struct brcmf_sdio *bus) #endif /* DEBUG */ /* On idle timeout clear activity flag and/or turn off clock */ - if ((atomic_read(&bus->dpc_tskcnt) == 0) && - (atomic_read(&bus->dpc_running) == 0) && - (bus->idletime > 0) && (bus->clkstate == CLK_AVAIL)) { - bus->idlecount++; - if (bus->idlecount > bus->idletime) { - brcmf_dbg(SDIO, "idle\n"); - sdio_claim_host(bus->sdiodev->func[1]); - brcmf_sdio_wd_timer(bus, 0); + if (!bus->dpc_triggered) { + rmb(); + if ((!bus->dpc_running) && (bus->idletime > 0) && + (bus->clkstate == CLK_AVAIL)) { + bus->idlecount++; + if (bus->idlecount > bus->idletime) { + brcmf_dbg(SDIO, "idle\n"); + sdio_claim_host(bus->sdiodev->func[1]); + brcmf_sdio_wd_timer(bus, 0); + bus->idlecount = 0; + brcmf_sdio_bus_sleep(bus, true, false); + sdio_release_host(bus->sdiodev->func[1]); + } + } else { bus->idlecount = 0; - brcmf_sdio_bus_sleep(bus, true, false); - sdio_release_host(bus->sdiodev->func[1]); } } else { bus->idlecount = 0; @@ -3645,13 +3653,14 @@ static void brcmf_sdio_dataworker(struct work_struct *work) struct brcmf_sdio *bus = container_of(work, struct brcmf_sdio, datawork); - while (atomic_read(&bus->dpc_tskcnt)) { - atomic_set(&bus->dpc_running, 1); - atomic_set(&bus->dpc_tskcnt, 0); + bus->dpc_running = true; + wmb(); + while (ACCESS_ONCE(bus->dpc_triggered)) { + bus->dpc_triggered = false; brcmf_sdio_dpc(bus); bus->idlecount = 0; - atomic_set(&bus->dpc_running, 0); } + bus->dpc_running = false; if (brcmf_sdiod_freezing(bus->sdiodev)) { brcmf_sdiod_change_state(bus->sdiodev, BRCMF_SDIOD_DOWN); brcmf_sdiod_try_freeze(bus->sdiodev); @@ -4144,8 +4153,8 @@ struct brcmf_sdio *brcmf_sdio_probe(struct brcmf_sdio_dev *sdiodev) bus->watchdog_tsk = NULL; } /* Initialize DPC thread */ - atomic_set(&bus->dpc_tskcnt, 0); - atomic_set(&bus->dpc_running, 0); + bus->dpc_triggered = false; + bus->dpc_running = false; /* Assign bus interface call back */ bus->sdiodev->bus_if->dev = bus->sdiodev->dev;