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brcmfmac: Use atomic functions for intstatus update. 

The intstatus in sdio code can be updated from different
threads. To protect intstatus access, atomic functions are
used. One of them is set_bit, but this function is not
guaranteed atomic on all platforms. The loop was replaced
with local created OR function.

Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Daniel (Deognyoun) Kim <dekim@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Hante Meuleman 2014-03-06 10:16:12 +01:00 committed by John W. Linville
parent 561e722201
commit 5cbb9c285b
1 changed files with 15 additions and 14 deletions
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29
drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
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@ -2439,12 +2439,21 @@ static inline void brcmf_sdio_clrintr(struct brcmf_sdio *bus)
}
}
static void atomic_orr(int val, atomic_t *v)
{
int old_val;
old_val = atomic_read(v);
while (atomic_cmpxchg(v, old_val, val | old_val) != old_val)
old_val = atomic_read(v);
}
static int brcmf_sdio_intr_rstatus(struct brcmf_sdio *bus)
{
struct brcmf_core *buscore;
u32 addr;
unsigned long val;
int n, ret;
int ret;
buscore = brcmf_chip_get_core(bus->ci, BCMA_CORE_SDIO_DEV);
addr = buscore->base + offsetof(struct sdpcmd_regs, intstatus);
@ -2452,7 +2461,7 @@ static int brcmf_sdio_intr_rstatus(struct brcmf_sdio *bus)
val = brcmf_sdiod_regrl(bus->sdiodev, addr, &ret);
bus->sdcnt.f1regdata++;
if (ret != 0)
val = 0;
return ret;
val &= bus->hostintmask;
atomic_set(&bus->fcstate, !!(val & I_HMB_FC_STATE));
@ -2461,13 +2470,7 @@ static int brcmf_sdio_intr_rstatus(struct brcmf_sdio *bus)
if (val) {
brcmf_sdiod_regwl(bus->sdiodev, addr, val, &ret);
bus->sdcnt.f1regdata++;
}
if (ret) {
atomic_set(&bus->intstatus, 0);
} else if (val) {
for_each_set_bit(n, &val, 32)
set_bit(n, (unsigned long *)&bus->intstatus.counter);
atomic_orr(val, &bus->intstatus);
}
return ret;
@ -2479,7 +2482,7 @@ static void brcmf_sdio_dpc(struct brcmf_sdio *bus)
unsigned long intstatus;
uint txlimit = bus->txbound; /* Tx frames to send before resched */
uint framecnt; /* Temporary counter of tx/rx frames */
int err = 0, n;
int err = 0;
brcmf_dbg(TRACE, "Enter\n");
@ -2583,10 +2586,8 @@ static void brcmf_sdio_dpc(struct brcmf_sdio *bus)
}
/* Keep still-pending events for next scheduling */
if (intstatus) {
for_each_set_bit(n, &intstatus, 32)
set_bit(n, (unsigned long *)&bus->intstatus.counter);
}
if (intstatus)
atomic_orr(intstatus, &bus->intstatus);
brcmf_sdio_clrintr(bus);