Tried that and it is now worse. The machine now noticeably pauses each
time there is a DMA failure.
[ 245.190471] ath9k: timeout (100000 us) on reg 0x7000: 0xffffffff &
0x00000003 != 0x00000000
[ 245.190475] ath9k: Chip reset failed
[ 245.190476] ath9k: Unable to reset channel (2457 Mhz) reset status -22
[ 245.190480] ath9k: Unable to set channel
[ 245.379304] ath9k: timeout (100000 us) on reg 0x7000: 0xffffffff &
0x00000003 != 0x00000000
[ 245.379318] ath9k: Chip reset failed
[ 245.379323] ath9k: Unable to reset hardware; reset status -22
[ 245.390319] ath9k: DMA failed to stop in 10 ms AR_CR=0xffffffff
AR_DIAG_SW=0xffffffff
[ 245.500379] ath9k: timeout (100000 us) on reg 0x7000: 0xffffffff &
0x00000003 != 0x00000000
[ 245.608631] ath9k: timeout (100000 us) on reg 0x7000: 0xffffffff &
0x00000003 != 0x00000000
[ 245.649520] ath9k 0000:06:00.0: PCI INT A disabled
[ 245.649597] ath9k: Driver unloaded
[ 258.115308] ath9k 0000:06:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[ 258.225773] ath9k: timeout (100000 us) on reg 0x7044: 0xffffffff &
0x0000000f != 0x00000002
[ 258.225783] ath9k: Couldn't reset chip
[ 258.225795] ath9k: Unable to attach hardware; HAL status -5
[ 258.226861] ath9k 0000:06:00.0: PCI INT A disabled
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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ath9k - crashes and won't reset
https://bugs.launchpad.net/bugs/407040
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