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authorJoerg Albert <jal2@gmx.de>2009-09-15 23:27:53 +0200
committerJohn W. Linville <linville@tuxdriver.com>2009-10-07 16:39:38 -0400
commit181af387033e20065e94363d07ecbace7738278c (patch)
tree7022e3a625e89ac9f1bf55bdf75eb95b88752485
parent7c52c07de8bd0433db6b3e0147544e5a2f01b786 (diff)
ar9170: handle overflow in tsf_low register during get_tsf
ar9170_op_get_tsf: handle a carry from TSF_L into TSF_H by reading TSF_H twice. Signed-off-by: Joerg Albert <jal2@gmx.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--drivers/net/wireless/ath/ar9170/cmd.c3
-rw-r--r--drivers/net/wireless/ath/ar9170/cmd.h1
-rw-r--r--drivers/net/wireless/ath/ar9170/main.c24
3 files changed, 18 insertions, 10 deletions
diff --git a/drivers/net/wireless/ath/ar9170/cmd.c b/drivers/net/wireless/ath/ar9170/cmd.c
index f57a6200167..cf6f5c4174a 100644
--- a/drivers/net/wireless/ath/ar9170/cmd.c
+++ b/drivers/net/wireless/ath/ar9170/cmd.c
@@ -72,8 +72,7 @@ int ar9170_write_reg(struct ar9170 *ar, const u32 reg, const u32 val)
return err;
}
-static int ar9170_read_mreg(struct ar9170 *ar, int nregs,
- const u32 *regs, u32 *out)
+int ar9170_read_mreg(struct ar9170 *ar, int nregs, const u32 *regs, u32 *out)
{
int i, err;
__le32 *offs, *res;
diff --git a/drivers/net/wireless/ath/ar9170/cmd.h b/drivers/net/wireless/ath/ar9170/cmd.h
index a4f0e50e52b..826c45e6b27 100644
--- a/drivers/net/wireless/ath/ar9170/cmd.h
+++ b/drivers/net/wireless/ath/ar9170/cmd.h
@@ -44,6 +44,7 @@
int ar9170_write_mem(struct ar9170 *ar, const __le32 *data, size_t len);
int ar9170_write_reg(struct ar9170 *ar, const u32 reg, const u32 val);
int ar9170_read_reg(struct ar9170 *ar, u32 reg, u32 *val);
+int ar9170_read_mreg(struct ar9170 *ar, int nregs, const u32 *regs, u32 *out);
int ar9170_echo_test(struct ar9170 *ar, u32 v);
/*
diff --git a/drivers/net/wireless/ath/ar9170/main.c b/drivers/net/wireless/ath/ar9170/main.c
index 81c6cf1135b..de0ba2bf769 100644
--- a/drivers/net/wireless/ath/ar9170/main.c
+++ b/drivers/net/wireless/ath/ar9170/main.c
@@ -2192,22 +2192,30 @@ static u64 ar9170_op_get_tsf(struct ieee80211_hw *hw)
{
struct ar9170 *ar = hw->priv;
int err;
- u32 tsf_low;
- u32 tsf_high;
u64 tsf;
+#define NR 3
+ static const u32 addr[NR] = { AR9170_MAC_REG_TSF_H,
+ AR9170_MAC_REG_TSF_L,
+ AR9170_MAC_REG_TSF_H };
+ u32 val[NR];
+ int loops = 0;
mutex_lock(&ar->mutex);
- err = ar9170_read_reg(ar, AR9170_MAC_REG_TSF_L, &tsf_low);
- if (!err)
- err = ar9170_read_reg(ar, AR9170_MAC_REG_TSF_H, &tsf_high);
+
+ while (loops++ < 10) {
+ err = ar9170_read_mreg(ar, NR, addr, val);
+ if (err || val[0] == val[2])
+ break;
+ }
+
mutex_unlock(&ar->mutex);
if (WARN_ON(err))
return 0;
-
- tsf = tsf_high;
- tsf = (tsf << 32) | tsf_low;
+ tsf = val[0];
+ tsf = (tsf << 32) | val[1];
return tsf;
+#undef NR
}
static int ar9170_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,