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authorIngo Molnar <mingo@elte.hu>2008-06-25 12:30:26 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-25 12:30:26 +0200
commit037a6079eb925f7653bddf1501f777abcd4fc91e (patch)
tree2249c4c4852837163e67190bf8bfe06516a65510 /drivers/net/wireless/b43/main.c
parent0754557d72c1fbfc5fcfd5235e7c23ae6f77248c (diff)
parent543cf4cb3fe6f6cae3651ba918b9c56200b257d0 (diff)
Merge branch 'linus' into x86/garttip-x86-gart-2008-06-25_10.30_Wed
Diffstat (limited to 'drivers/net/wireless/b43/main.c')
-rw-r--r--drivers/net/wireless/b43/main.c16
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);
}