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SubjectRe: [ 57/72] genirq: Unmask oneshot irqs when thread was not woken
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Hi

On Monday 05 March 2012, Sven Joachim wrote:
> On 2012-02-28 02:05 +0100, Greg KH wrote:
>
> > 3.2-stable review patch. If anyone has any objections, please let me know.
>
> Alas, the commit below broke the WiFi on my laptop, where
> "iwlist wlan0 scan" now just reports: " wlan0 No scan results".
>
> This is not specific to 3.2, the same problem exists in 3.0.23 and
> 3.3-rc6 while previous releases worked.

I can confirm this regression on an old PIII based notebook with a
32 bit BCM4306/3 PCMCIA card:

02:00.0 Network controller [0280]: Broadcom Corporation BCM4306 802.11b/g Wireless LAN Controller [14e4:4320] (rev 03)
Subsystem: Linksys WPC54G v1 / WPC54GS v1 802.11g Wireless-G Notebook Adapter [1737:4320]
Flags: bus master, fast devsel, latency 64, IRQ 10
Memory at 20000000 (32-bit, non-prefetchable) [size=8K]
Capabilities: [40] Power Management version 2
Kernel driver in use: b43-pci-bridge
I can observe these differences in the dmesg output (3.2.9 + current
stable queue-3.2):

The kernel configuration is identical in both cases, the only
difference is "genirq: Unmask oneshot irqs when thread was not woken"
being applied or not.
--- working <-- 3.2.9 + current stable queue-3.2, with "genirq: Unmask oneshot irqs when thread was not woken" reverted
+++ broken <-- 3.2.9 + current stable queue-3.2
@@ -125,6 +125,7 @@ Initializing cgroup subsys freezer
Initializing cgroup subsys net_cls
Initializing cgroup subsys blkio
Initializing cgroup subsys perf_event
+CPU serial number disabled.
mce: CPU supports 5 MCE banks
SMP alternatives: switching to UP code
Freeing SMP alternatives: 8k freed
@@ -137,9 +138,16 @@ SMP disabled
Performance Events:
no APIC, boot with the "lapic" boot parameter to force-enable it.
no hardware sampling interrupt available.
-Broken PMU hardware detected, using software events only.
+p6 PMU driver.
+... version: 0
+... bit width: 32
+... generic registers: 2
+... value mask: 00000000ffffffff
+... max period: 000000007fffffff
+... fixed-purpose events: 0
+... event mask: 0000000000000003
Brought up 1 CPUs
Total of 1 processors activated (1989.75 BogoMIPS).
devtmpfs: initialized
PM: Registering ACPI NVS region at eeff000 (4096 bytes)
print_constraints: dummy:
@@ -174,12 +182,12 @@ pci 0000:00:00.0: reg 10: [mem 0xec00000
type 1 class 0x000604
pci 0000:00:01.0: supports D1
type 2 class 0x000607
-pci 0000:00:04.0: reg 10: [mem 0x10000000-0x10000fff]
+pci 0000:00:04.0: reg 10: [mem 0x00000000-0x00000fff]
pci 0000:00:04.0: supports D1 D2
pci 0000:00:04.0: PME# supported from D0 D1 D2 D3hot D3cold
pci 0000:00:04.0: PME# disabled
type 2 class 0x000607
-pci 0000:00:04.1: reg 10: [mem 0x14000000-0x14000fff]
+pci 0000:00:04.1: reg 10: [mem 0x00000000-0x00000fff]
pci 0000:00:04.1: supports D1 D2
pci 0000:00:04.1: PME# supported from D0 D1 D2 D3hot D3cold
pci 0000:00:04.1: PME# disabled
@@ -299,6 +307,10 @@ pnp: PnP ACPI: found 11 devices
ACPI: ACPI bus type pnp unregistered
Switching to clocksource acpi_pm
PCI: max bus depth: 1 pci_try_num: 2
+pci 0000:00:04.0: BAR 0: assigned [mem 0x10000000-0x10000fff]
+(PCI address [0x10000000-0x10000fff])
+pci 0000:00:04.1: BAR 0: assigned [mem 0x14000000-0x14000fff]
+(PCI address [0x14000000-0x14000fff])
pci 0000:00:11.0: BAR 6: assigned [mem 0x10020000-0x1003ffff pref]
pci 0000:00:04.1: BAR 16: assigned [mem 0x18000000-0x1bffffff]
pci 0000:00:04.1: BAR 15: assigned [mem 0x1c000000-0x1fffffff pref]
@@ -326,9 +338,11 @@ pci 0000:00:01.0: setting latency timer
enabled at IRQ 10
PCI: setting IRQ 10 as level-triggered
-> GSI 10 (level, low) -> IRQ 10
+pci 0000:00:04.0: setting latency timer to 64
enabled at IRQ 11
PCI: setting IRQ 11 as level-triggered
-> GSI 11 (level, low) -> IRQ 11
+pci 0000:00:04.1: setting latency timer to 64
pci_bus 0000:00: resource 0 [io 0x0000-0xffff]
pci_bus 0000:00: resource 1 [mem 0x00000000-0xffffffff]
pci_bus 0000:01: resource 1 [mem 0xe8100000-0xe81fffff]
@@ -562,20 +576,6 @@ b43-phy0: Hardware crypto acceleration n
b43-phy0: QoS not supported by firmware
ADDRCONF(NETDEV_UP): wlan0: link is not ready
NET: Registered protocol family 17
-wlan0: authenticate with [redacted MAC address] (try 1)
-wlan0: authenticated
-wlan0: associate with [redacted MAC address] (try 1)
-wlan0: RX AssocResp from [redacted MAC address] (capab=0x411 status=0 aid=1)
-wlan0: associated
-ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
-cfg80211: Calling CRDA for country: DE
-Intel AES-NI instructions are not detected.
-cfg80211: Regulatory domain changed to country: DE
-cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
-cfg80211: (2400000 KHz - 2483500 KHz @ 40000 KHz), (N/A, 2000 mBm)
-cfg80211: (5150000 KHz - 5250000 KHz @ 40000 KHz), (N/A, 2000 mBm)
-cfg80211: (5250000 KHz - 5350000 KHz @ 40000 KHz), (N/A, 2000 mBm)
-cfg80211: (5470000 KHz - 5725000 KHz @ 40000 KHz), (N/A, 2698 mBm)
lp0: using parport0 (interrupt-driven).
lp0: console ready
ppdev: user-space parallel port driver
@@ -589,4 +589,3 @@ mtrr: base(0xf2000000) is not aligned on
agpgart-via 0000:00:00.0: AGP 2.0 bridge
agpgart-via 0000:00:00.0: putting AGP V2 device into 0x mode
pci 0000:01:00.0: putting AGP V2 device into 0x mode
-wlan0: no IPv6 routers present
While I don't get any revealing error messages, once "genirq: Unmask
oneshot irqs when thread was not woken" is applied the wlan card
stops working (no scan results, unable to auth).

I cannot reproduce this problem on a different amd64/ 64 bit system
with a BCM4318 PCI card, which continues to work fine.

Regards
Stefan Lippers-Hollmann


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