brcmfmac: use atomic variable for interrupt pending flag

Interrupt pending flag used in SDIO bus layer could be used in
multiple processes in different context. Use atomic_t make sure
every interrupt is handled.

Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
index 2ca9e8c..b0794e8 100644 (file)
--- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
@@ -531,7 +531,7 @@ struct brcmf_sdio {
 
        bool intr;              /* Use interrupts */
        bool poll;              /* Use polling */
-       bool ipend;             /* Device interrupt is pending */
+       atomic_t ipend;         /* Device interrupt is pending */
        uint spurious;          /* Count of spurious interrupts */
        uint pollrate;          /* Ticks between device polls */
        uint polltick;          /* Tick counter */
@@ -2151,7 +2151,7 @@ static uint brcmf_sdbrcm_sendfromq(struct brcmf_sdio *bus, uint maxframes)
                        if (ret != 0)
                                break;
                        if (intstatus & bus->hostintmask)
-                               bus->ipend = true;
+                               atomic_set(&bus->ipend, 1);
                }
        }
 
@@ -2249,7 +2249,7 @@ static inline void brcmf_sdbrcm_clrintr(struct brcmf_sdio *bus)
        unsigned long flags;
 
        spin_lock_irqsave(&bus->sdiodev->irq_en_lock, flags);
-       if (!bus->sdiodev->irq_en && !bus->ipend) {
+       if (!bus->sdiodev->irq_en && !atomic_read(&bus->ipend)) {
                enable_irq(bus->sdiodev->irq);
                bus->sdiodev->irq_en = true;
        }
@@ -2332,8 +2332,8 @@ static bool brcmf_sdbrcm_dpc(struct brcmf_sdio *bus)
                goto clkwait;
 
        /* Pending interrupt indicates new device status */
-       if (bus->ipend) {
-               bus->ipend = false;
+       if (atomic_read(&bus->ipend) > 0) {
+               atomic_set(&bus->ipend, 0);
                err = r_sdreg32(bus, &newstatus,
                                offsetof(struct sdpcmd_regs, intstatus));
                bus->sdcnt.f1regdata++;
@@ -2478,7 +2478,7 @@ clkwait:
        } else if (bus->clkstate == CLK_PENDING) {
                brcmf_dbg(INFO, "rescheduled due to CLK_PENDING awaiting I_CHIPACTIVE interrupt\n");
                resched = true;
-       } else if (bus->intstatus || bus->ipend ||
+       } else if (bus->intstatus || atomic_read(&bus->ipend) > 0 ||
                (!bus->fcstate && brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol)
                 && data_ok(bus)) || PKT_AVAILABLE()) {
                resched = true;
@@ -3692,7 +3692,7 @@ void brcmf_sdbrcm_isr(void *arg)
        }
        /* Count the interrupt call */
        bus->sdcnt.intrcount++;
-       bus->ipend = true;
+       atomic_set(&bus->ipend, 1);
 
        /* Disable additional interrupts (is this needed now)? */
        if (!bus->intr)
@@ -3740,7 +3740,7 @@ static bool brcmf_sdbrcm_bus_watchdog(struct brcmf_sdio *bus)
                                 schedule the DPC */
                        if (intstatus) {
                                bus->sdcnt.pollcnt++;
-                               bus->ipend = true;
+                               atomic_set(&bus->ipend, 1);
 
                                bus->dpc_sched = true;
                                if (bus->dpc_tsk) {
@@ -3784,7 +3784,7 @@ static bool brcmf_sdbrcm_bus_watchdog(struct brcmf_sdio *bus)
 
        up(&bus->sdsem);
 
-       return bus->ipend;
+       return (atomic_read(&bus->ipend) > 0);
 }
 
 static bool brcmf_sdbrcm_chipmatch(u16 chipid)