From mboxrd@z Thu Jan 1 00:00:00 1970 From: Philippe De Muyter Subject: XT-PIC interrupts blocked by usbserial ? [Was Re: Intel ICH9M bug : sata unusable with usbserial] Date: Thu, 3 Mar 2011 15:58:12 +0100 Message-ID: <20110303145812.GA3489@frolo.macqel> References: <20110228140149.GA18189@frolo.macqel> <20110228150553.66d02bc7@lxorguk.ukuu.org.uk> <20110228151618.GA16322@htj.dyndns.org> <20110228170556.GA29545@frolo.macqel> <20110228173634.GA23008@htj.dyndns.org> <20110228192700.GA3305@kroah.com> <20110301123452.GA1954@frolo.macqel> <20110301141627.GB12881@kroah.com> <20110301150018.GA17827@frolo.macqel> <4D6E477A.9020401@teksavvy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <4D6E477A.9020401-R6A+fiHC8nRWk0Htik3J/w@public.gmane.org> Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Mark Lord Cc: Greg KH , Tejun Heo , Alan Cox , linux-ide-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Greg Kroah-Hartman , linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-ide@vger.kernel.org Summary : When I started to listen to a USB serial GPS receiver, the interrupts of my sata disk were blocked until reboot :( Switching in the BIOS from 'APIC disabled' to 'APIC enabled' made the problem disappear. On Wed, Mar 02, 2011 at 08:34:50AM -0500, Mark Lord wrote: > On 11-03-01 10:00 AM, Philippe De Muyter wrote: > > On Tue, Mar 01, 2011 at 09:16:27AM -0500, Greg KH wrote: > >> On Tue, Mar 01, 2011 at 01:34:52PM +0100, Philippe De Muyter wrote: > >>> previously we had all but one usb interrupts on the same line as ata_piix : > >>> 5: 17183 XT-PIC-XT-PIC ata_piix, ata_piix, ehci_hcd:usb1, ehci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb5, uhci_hcd:usb6, uhci_hcd:usb7, uhci_hcd:usb8 > >>> while now they are spread on different lines : 16, 18, 19, 21 and 22 > >>> > >>> So I wonder if there is still a bug, but that it is not triggered anymore. > >>> > >>> Is there a way to tell which interrupt line the USB GPS receiver is connected > >>> to ? > >> > >> See which USB bus the device is on, using lsusb. It should match up > >> with the usbX number in the above list. > > > > Given that I get : > > > > tmp199:~ # lsusb > > ... > > Bus 007 Device 002: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port > > tmp199:~ # cat /proc/interrupts > > CPU0 CPU1 > > ... > > 19: 996143 995511 IO-APIC-fasteoi ata_piix, ata_piix, uhci_hcd:usb5, uhci_hcd:usb7 > > tmp199:~ # > > > > my USB GPS receiver and my sata disk still share the same interrupt, I assume ? > > > > What's changed now is that this interrupt line is now IO-APIC-fasteoi instead > > of XT-PIC-XT-PIC. Maybe there's something to look at there ? > > > >> > >> Glad enabling APIC in your BIOS fixed this. > > > > I am glad too :) > > Nothing got "fixed" by doing that. > Swept under the rug, yes. > > But the bug is still there. If it is a bug (what I also believe) it is not a new one : Before installing 2.6.37-20-desktop (opensuse 11.4) on this new hardware, I had the same problem with 2.6.31.14-0.6-desktop (opensuse 11.2) and with 2.6.22.18-0.2-default (opensuse 10.3) The only interesting file where I find the word 'XT-PIC' is arch/alpha/kernel/irq_i8259.c Best regards Philippe -- Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html