Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

Conflicts:
	drivers/net/igb/igb_main.c
	drivers/net/qlge/qlge_main.c
	drivers/net/wireless/ath9k/ath9k.h
	drivers/net/wireless/ath9k/core.h
	drivers/net/wireless/ath9k/hw.c

1 files changed, 21 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c
index eb750a503999..60e55d8c510b 100644
--- a/drivers/net/wireless/ath9k/hw.c
+++ b/drivers/net/wireless/ath9k/hw.c
@@ -391,6 +391,25 @@ static void ath9k_hw_set_defaults(struct ath_hw *ah)
 	}
 
 	ah->config.intr_mitigation = 1;
+
+	/*
+	 * We need this for PCI devices only (Cardbus, PCI, miniPCI)
+	 * _and_ if on non-uniprocessor systems (Multiprocessor/HT).
+	 * This means we use it for all AR5416 devices, and the few
+	 * minor PCI AR9280 devices out there.
+	 *
+	 * Serialization is required because these devices do not handle
+	 * well the case of two concurrent reads/writes due to the latency
+	 * involved. During one read/write another read/write can be issued
+	 * on another CPU while the previous read/write may still be working
+	 * on our hardware, if we hit this case the hardware poops in a loop.
+	 * We prevent this by serializing reads and writes.
+	 *
+	 * This issue is not present on PCI-Express devices or pre-AR5416
+	 * devices (legacy, 802.11abg).
+	 */
+	if (num_possible_cpus() > 1)
+		ah->config.serialize_regmode = SER_REG_MODE_AUTO;
 }
 
 static struct ath_hw *ath9k_hw_newstate(u16 devid, struct ath_softc *sc,
@@ -610,7 +629,8 @@ static struct ath_hw *ath9k_hw_do_attach(u16 devid, struct ath_softc *sc,
 	}
 
 	if (ah->config.serialize_regmode == SER_REG_MODE_AUTO) {
-		if (ah->hw_version.macVersion == AR_SREV_VERSION_5416_PCI) {
+		if (ah->hw_version.macVersion == AR_SREV_VERSION_5416_PCI ||
+		    (AR_SREV_9280(ah) && !ah->is_pciexpress)) {
 			ah->config.serialize_regmode =
 				SER_REG_MODE_ON;
 		} else {