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46 lines
1.8 KiB
Diff
46 lines
1.8 KiB
Diff
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From: Sergey Ryazanov <ryazanov.s.a@gmail.com>
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Date: Tue, 3 Feb 2015 22:37:26 +0300
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Subject: [PATCH] ath5k: fix spontaneus AR5312 freezes
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Sometimes while CPU have some load and ath5k doing the wireless
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interface reset the whole WiSoC completely freezes. Set of tests shows
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that using atomic delay function while we wait interface reset helps to
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avoid such freezes.
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The easiest way to reproduce this issue: create a station interface,
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start continous scan with wpa_supplicant and load CPU by something. Or
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just create multiple station interfaces and put them all in continous
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scan.
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This patch partially reverts the commit 1846ac3dbec0 ("ath5k: Use
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usleep_range where possible"), which replaces initial udelay()
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by usleep_range().
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I do not know actual source of this issue, but all looks like that HW
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freeze is caused by transaction on internal SoC bus, while wireless
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block is in reset state.
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Also I should note that I do not know how many chips are affected, but I
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did not see this issue with chips, other than AR5312.
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CC: Jiri Slaby <jirislaby@gmail.com>
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CC: Nick Kossifidis <mickflemm@gmail.com>
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CC: Luis R. Rodriguez <mcgrof@do-not-panic.com>
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Fixes: 1846ac3dbec0 ("ath5k: Use usleep_range where possible")
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Reported-by: Christophe Prevotaux <c.prevotaux@rural-networks.com>
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Tested-by: Christophe Prevotaux <c.prevotaux@rural-networks.com>
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Tested-by: Eric Bree <ebree@nltinc.com>
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Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
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---
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--- a/drivers/net/wireless/ath/ath5k/reset.c
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+++ b/drivers/net/wireless/ath/ath5k/reset.c
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@@ -478,7 +478,7 @@ ath5k_hw_wisoc_reset(struct ath5k_hw *ah
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regval = ioread32(reg);
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iowrite32(regval | val, reg);
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regval = ioread32(reg);
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- usleep_range(100, 150);
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+ udelay(100); /* NB: should be atomic */
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/* Bring BB/MAC out of reset */
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iowrite32(regval & ~val, reg);
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