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| author | Ingo Molnar <mingo@elte.hu> | 2009-03-26 18:49:48 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-26 18:49:48 +0100 |
| commit | 18ffa418aead13c56515ac74cd26105102128aca (patch) | |
| tree | 2096ea8db3b2594bd25ad39a70edc691219f669b /drivers/net/wireless/ath9k/hw.c | |
| parent | bzip2/lzma: make internal initramfs compression configurable (diff) | |
| parent | Linux 2.6.29 (diff) | |
| download | linux-18ffa418aead13c56515ac74cd26105102128aca.tar.xz linux-18ffa418aead13c56515ac74cd26105102128aca.zip | |
Merge commit 'v2.6.29' into x86/setup-lzma
Diffstat (limited to 'drivers/net/wireless/ath9k/hw.c')
| -rw-r--r-- | drivers/net/wireless/ath9k/hw.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c index 34474edefc97..c38a00bbce64 100644 --- a/drivers/net/wireless/ath9k/hw.c +++ b/drivers/net/wireless/ath9k/hw.c @@ -437,6 +437,25 @@ static void ath9k_hw_set_defaults(struct ath_hal *ah) } 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->ah_config.serialize_regmode = SER_REG_MODE_AUTO; } static struct ath_hal_5416 *ath9k_hw_newstate(u16 devid, @@ -668,7 +687,8 @@ static struct ath_hal *ath9k_hw_do_attach(u16 devid, struct ath_softc *sc, } if (ah->ah_config.serialize_regmode == SER_REG_MODE_AUTO) { - if (ah->ah_macVersion == AR_SREV_VERSION_5416_PCI) { + if (ah->ah_macVersion == AR_SREV_VERSION_5416_PCI || + (AR_SREV_9280(ah) && !ah->ah_isPciExpress)) { ah->ah_config.serialize_regmode = SER_REG_MODE_ON; } else { |