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SubjectRe: [ 57/72] genirq: Unmask oneshot irqs when thread was not woken
On Mon, 5 Mar 2012, Stefan Lippers-Hollmann wrote:
> 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.

I can't see why reverting that genirq patch would cause this.

> 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

Ditto.

> 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]

Even more.

There is something extremly fishy.

Thanks,

tglx


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