ath9k: skip ->config_pci_powersave() if PCIe port has ASPM disabled
authorStanislaw Gruszka <sgruszka@redhat.com>
Fri, 29 Jul 2011 13:59:08 +0000 (15:59 +0200)
committerJohn W. Linville <linville@tuxdriver.com>
Mon, 1 Aug 2011 17:46:46 +0000 (13:46 -0400)
commitd4930086bdd0c08a8b3a4d66a9c702297cb74a99
tree8834a291d6f1ad0779814f9e55a4f391b98e6f00
parent84404623da45aac04595a8f5760a58df0e955d87
ath9k: skip ->config_pci_powersave() if PCIe port has ASPM disabled

We receive many bug reports about system hang during suspend/resume
when ath9k driver is in use. Adrian Chadd remarked that this problem
happens on systems that have ASPM disabled.

To do not hit the bug, skip doing ->config_pci_powersave magic if PCIe
downstream port device, which ath9k device is connected to, has ASPM
disabled.

Bug was introduced by:

commit 53bc7aa08b48e5cd745f986731cc7dc24eef2a9f
Author: Vivek Natarajan <vnatarajan@atheros.com>
Date:   Mon Apr 5 14:48:04 2010 +0530

    ath9k: Add support for newer AR9285 chipsets.

Patch should address:
https://bugzilla.kernel.org/show_bug.cgi?id=37462
https://bugzilla.kernel.org/show_bug.cgi?id=37082
https://bugzilla.redhat.com/show_bug.cgi?id=697157

however I did not receive confirmation about that, except from Camilo
Mesias, whose system stops hang regularly with this patch (but still
hangs from time to time, but this is probably some other bug).

Tested-by: Camilo Mesias <camilo@mesias.co.uk>
Cc: stable@kernel.org # 2.6.35+
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
drivers/net/wireless/ath/ath9k/ar9002_hw.c
drivers/net/wireless/ath/ath9k/ar9003_hw.c
drivers/net/wireless/ath/ath9k/hw.c
drivers/net/wireless/ath/ath9k/hw.h
drivers/net/wireless/ath/ath9k/pci.c