diff options
Diffstat (limited to 'drivers/net/wireless/b43/main.c')
| -rw-r--r-- | drivers/net/wireless/b43/main.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c index 6c3d9ea0a9f8..fa4b0d8b74a2 100644 --- a/drivers/net/wireless/b43/main.c +++ b/drivers/net/wireless/b43/main.c @@ -1145,7 +1145,6 @@ static void b43_generate_noise_sample(struct b43_wldev *dev) b43_jssi_write(dev, 0x7F7F7F7F); b43_write32(dev, B43_MMIO_MACCMD, b43_read32(dev, B43_MMIO_MACCMD) | B43_MACCMD_BGNOISE); - B43_WARN_ON(dev->noisecalc.channel_at_start != dev->phy.channel); } static void b43_calculate_link_quality(struct b43_wldev *dev) @@ -1154,7 +1153,6 @@ static void b43_calculate_link_quality(struct b43_wldev *dev) if (dev->noisecalc.calculation_running) return; - dev->noisecalc.channel_at_start = dev->phy.channel; dev->noisecalc.calculation_running = 1; dev->noisecalc.nr_samples = 0; @@ -1171,9 +1169,16 @@ static void handle_irq_noise(struct b43_wldev *dev) /* Bottom half of Link Quality calculation. */ + /* Possible race condition: It might be possible that the user + * changed to a different channel in the meantime since we + * started the calculation. We ignore that fact, since it's + * not really that much of a problem. The background noise is + * an estimation only anyway. Slightly wrong results will get damped + * by the averaging of the 8 sample rounds. Additionally the + * value is shortlived. So it will be replaced by the next noise + * calculation round soon. */ + B43_WARN_ON(!dev->noisecalc.calculation_running); - if (dev->noisecalc.channel_at_start != phy->channel) - goto drop_calculation; *((__le32 *)noise) = cpu_to_le32(b43_jssi_read(dev)); if (noise[0] == 0x7F || noise[1] == 0x7F || noise[2] == 0x7F || noise[3] == 0x7F) @@ -1214,11 +1219,10 @@ static void handle_irq_noise(struct b43_wldev *dev) average -= 48; dev->stats.link_noise = average; - drop_calculation: dev->noisecalc.calculation_running = 0; return; } - generate_new: +generate_new: b43_generate_noise_sample(dev); } |