From: Hante Meuleman <meuleman@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@xxxxxxxxxxxx>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@xxxxxxxxxxxx>
Reviewed-by: Daniel (Deognyoun) Kim <dekim@xxxxxxxxxxxx>
Signed-off-by: Hante Meuleman <meuleman@xxxxxxxxxxxx>
Signed-off-by: Arend van Spriel <arend@xxxxxxxxxxxx>
---
drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c | 29 ++++++++++----------
1 file changed, 15 insertions(+), 14 deletions(-)
diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
index ac61419..90ff406 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
@@ -2444,12 +2444,21 @@ 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);
@@ -2457,7 +2466,7 @@ 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));
@@ -2466,13 +2475,7 @@ 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;
@@ -2484,7 +2487,7 @@ 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");
@@ -2588,10 +2591,8 @@ 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);
--
1.7.10.4
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