Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Alan Stern]

On Wed, 23 Feb 2011, Alexander Holler wrote:

> Am 23.02.2011 09:06, schrieb Alexander Holler:
> > Am 16.02.2011 02:44, schrieb Greg KH:
> >> 2.6.32-longterm review patch. If anyone has any objections, please let
> >> us know.
> >
> > This patch killed the MUSB-host-functionality here (on a BeagleBoard).
> 
> Sorry, haven't seen at first, that the question was for 2.6.32. I had to 
> revert this patch for 2.6.37.1. Without the revert I've got endless 
> messages that the "parent hub has no TT".
> 
> I've configured musb in gadget-mode and I'm loading g_zero to use a 
> bt-dongle attached to the OTG-(MUSB-)port.
> 
> > Regards,
> >
> > Alexander

On Wed, 23 Feb 2011, Michael Jones wrote:

> Hi all,
> 
> My OMAP37 board started choking on my USB mouse when I updated from
> 2.6.37 to 2.6.38rc5.  I've tracked it down to commit
> d199c96d41d80a567493e12b8e96ea056a1350c1, "USB: prevent buggy hubs from
> crashing the USB stack."  If I revert this commit, my mouse works again.
> Otherwise, I get the message:
> 
> usb 1-1: new low speed USB device using musb-hdrc and address 33
> usb 1-1: parent hub has no TT
> 
> repeatedly (with 'address' incrementing).
> 
> I'm using the musb-hdrc driver for the OTG USB port in host mode.
> 
> some relevant config:
> CONFIG_USB_EHCI_HCD_OMAP=y
> CONFIG_USB_MUSB_HDRC=y
> CONFIG_USB_MUSB_OMAP2PLUS=y
> CONFIG_USB_MUSB_HOST=y
> CONFIG_USB_MUSB_HDRC_HCD=y
> CONFIG_USB_INVENTRA_DMA=y
> 
> # lsusb
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> 
> Any thoughts on how to get around this besides just reverting the
> commit?  Did anybody already encounter this?
> 
> thanks,
> Michael

In both cases, it appears that the problem is caused by the fact that 
the musb host-controller driver doesn't set the hcd->has_tt flag.

Felipe, you should know where it belongs.  It should be easy enough to 
add.

Alan Stern

Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 418 bytes --]

Hi,

On Wed, Feb 23, 2011 at 10:26:20AM -0500, Alan Stern wrote:
> In both cases, it appears that the problem is caused by the fact that 
> the musb host-controller driver doesn't set the hcd->has_tt flag.
> 
> Felipe, you should know where it belongs.  It should be easy enough to 
> add.

Sure Alan, it's attached to this mail. Compile tested only though.
Michael, would you care to give your tested-by ?

-- 
balbi

[-- Attachment #2: 0001-usb-musb-core-set-has_tt-flag.diff --]
[-- Type: text/x-diff, Size: 1060 bytes --]

>From 65315c60a17f83e69d01888babe4445097c8ead0 Mon Sep 17 00:00:00 2001
From: Felipe Balbi <balbi@ti.com>
Date: Thu, 24 Feb 2011 10:36:53 +0200
Subject: [PATCH] usb: musb: core: set has_tt flag
Organization: Texas Instruments\n

MUSB is a non-standard host implementation which
can handle all speeds with the same core. We need
to set has_tt flag after commit
d199c96d41d80a567493e12b8e96ea056a1350c1 (USB: prevent
buggy hubs from crashing the USB stack) in order for
MUSB HCD to continue working.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 drivers/usb/musb/musb_core.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 54a8bd1..c292d5c 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1864,6 +1864,7 @@ allocate_instance(struct device *dev,
 	INIT_LIST_HEAD(&musb->out_bulk);
 
 	hcd->uses_new_polling = 1;
+	hcd->has_tt = 1;
 
 	musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
 	musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON;
-- 
1.7.4.rc2

Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Alexander Holler]

Hello,

Am 24.02.2011 09:57, schrieb Felipe Balbi:
> Hi,
>
> On Wed, Feb 23, 2011 at 10:26:20AM -0500, Alan Stern wrote:
>> In both cases, it appears that the problem is caused by the fact that
>> the musb host-controller driver doesn't set the hcd->has_tt flag.
>>
>> Felipe, you should know where it belongs.  It should be easy enough to
>> add.
>
> Sure Alan, it's attached to this mail. Compile tested only though.
> Michael, would you care to give your tested-by ?

I can do, I'm using exactly the same patch since yesterday. ;)

Tested-by: Alexander Holler <holler@ahsoftware.de>

Regards,

Alexander

Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Felipe Balbi]

Hi,

On Thu, Feb 24, 2011 at 10:15:23AM +0100, Alexander Holler wrote:
> >On Wed, Feb 23, 2011 at 10:26:20AM -0500, Alan Stern wrote:
> >>In both cases, it appears that the problem is caused by the fact that
> >>the musb host-controller driver doesn't set the hcd->has_tt flag.
> >>
> >>Felipe, you should know where it belongs.  It should be easy enough to
> >>add.
> >
> >Sure Alan, it's attached to this mail. Compile tested only though.
> >Michael, would you care to give your tested-by ?
> 
> I can do, I'm using exactly the same patch since yesterday. ;)
> 
> Tested-by: Alexander Holler <holler-SXC+2es9fhnfWeYVQQPykw@public.gmane.org>

Thanks a lot Alex, Greg, can you still take this to -rc ? Do you need a
pull request or you can take this one patch ?

-- 
balbi
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Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Greg KH]

On Thu, Feb 24, 2011 at 11:16:38AM +0200, Felipe Balbi wrote:
> Hi,
> 
> On Thu, Feb 24, 2011 at 10:15:23AM +0100, Alexander Holler wrote:
> > >On Wed, Feb 23, 2011 at 10:26:20AM -0500, Alan Stern wrote:
> > >>In both cases, it appears that the problem is caused by the fact that
> > >>the musb host-controller driver doesn't set the hcd->has_tt flag.
> > >>
> > >>Felipe, you should know where it belongs.  It should be easy enough to
> > >>add.
> > >
> > >Sure Alan, it's attached to this mail. Compile tested only though.
> > >Michael, would you care to give your tested-by ?
> > 
> > I can do, I'm using exactly the same patch since yesterday. ;)
> > 
> > Tested-by: Alexander Holler <holler@ahsoftware.de>
> 
> Thanks a lot Alex, Greg, can you still take this to -rc ? Do you need a
> pull request or you can take this one patch ?

Wait, where does this need to go?  For the final 2.6.38 release and then
also for .37-stable?

Or just .37-stable?

confused.

And no, I don't need a pull request, I can handle one patch through
email :)

thanks,

greg k-h

Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Felipe Balbi]

On Thu, Feb 24, 2011 at 09:18:14AM -0800, Greg KH wrote:
> On Thu, Feb 24, 2011 at 11:16:38AM +0200, Felipe Balbi wrote:
> > Hi,
> > 
> > On Thu, Feb 24, 2011 at 10:15:23AM +0100, Alexander Holler wrote:
> > > >On Wed, Feb 23, 2011 at 10:26:20AM -0500, Alan Stern wrote:
> > > >>In both cases, it appears that the problem is caused by the fact that
> > > >>the musb host-controller driver doesn't set the hcd->has_tt flag.
> > > >>
> > > >>Felipe, you should know where it belongs.  It should be easy enough to
> > > >>add.
> > > >
> > > >Sure Alan, it's attached to this mail. Compile tested only though.
> > > >Michael, would you care to give your tested-by ?
> > > 
> > > I can do, I'm using exactly the same patch since yesterday. ;)
> > > 
> > > Tested-by: Alexander Holler <holler@ahsoftware.de>
> > 
> > Thanks a lot Alex, Greg, can you still take this to -rc ? Do you need a
> > pull request or you can take this one patch ?
> 
> Wait, where does this need to go?  For the final 2.6.38 release and then
> also for .37-stable?
> 
> Or just .37-stable?
> 
> confused.
> 
> And no, I don't need a pull request, I can handle one patch through
> email :)

final .38 and .37-stable :-) Thanks Greg :-)

-- 
balbi

Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Alan Stern]

On Thu, 24 Feb 2011, Felipe Balbi wrote:

> On Thu, Feb 24, 2011 at 09:18:14AM -0800, Greg KH wrote:
> > On Thu, Feb 24, 2011 at 11:16:38AM +0200, Felipe Balbi wrote:
> > > Hi,
> > > 
> > > On Thu, Feb 24, 2011 at 10:15:23AM +0100, Alexander Holler wrote:
> > > > >On Wed, Feb 23, 2011 at 10:26:20AM -0500, Alan Stern wrote:
> > > > >>In both cases, it appears that the problem is caused by the fact that
> > > > >>the musb host-controller driver doesn't set the hcd->has_tt flag.
> > > > >>
> > > > >>Felipe, you should know where it belongs.  It should be easy enough to
> > > > >>add.
> > > > >
> > > > >Sure Alan, it's attached to this mail. Compile tested only though.
> > > > >Michael, would you care to give your tested-by ?
> > > > 
> > > > I can do, I'm using exactly the same patch since yesterday. ;)
> > > > 
> > > > Tested-by: Alexander Holler <holler@ahsoftware.de>
> > > 
> > > Thanks a lot Alex, Greg, can you still take this to -rc ? Do you need a
> > > pull request or you can take this one patch ?
> > 
> > Wait, where does this need to go?  For the final 2.6.38 release and then
> > also for .37-stable?
> > 
> > Or just .37-stable?
> > 
> > confused.
> > 
> > And no, I don't need a pull request, I can handle one patch through
> > email :)
> 
> final .38 and .37-stable :-) Thanks Greg :-)

It's important that this patch appear in .37-stable at the same time as
the $SUBJECT patch.  If that means delaying $SUBJECT for one release, 
so be it -- it was not a very important change.

Alan Stern

Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Alexander Holler]

Hello,

Am 24.02.2011 18:57, schrieb Alan Stern:

> It's important that this patch appear in .37-stable at the same time as
> the $SUBJECT patch.  If that means delaying $SUBJECT for one release,
> so be it -- it was not a very important change.

Too late, 2.6.37.1 is already broken. But the patch could be still 
applied to 2.6.32-longterm, at least the message I've replied to asked 
about objections for that version.

Regards,

Alexander

Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Greg KH]

On Thu, Feb 24, 2011 at 07:11:34PM +0100, Alexander Holler wrote:
> Hello,
> 
> Am 24.02.2011 18:57, schrieb Alan Stern:
> 
> >It's important that this patch appear in .37-stable at the same time as
> >the $SUBJECT patch.  If that means delaying $SUBJECT for one release,
> >so be it -- it was not a very important change.
> 
> Too late, 2.6.37.1 is already broken. But the patch could be still
> applied to 2.6.32-longterm, at least the message I've replied to
> asked about objections for that version.

It's too late for that release as well, as it's already included in the
last .32 stable release.  I'll revert it there also for now.

thanks,

greg k-h

Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Greg KH]

On Thu, Feb 24, 2011 at 12:57:20PM -0500, Alan Stern wrote:
> On Thu, 24 Feb 2011, Felipe Balbi wrote:
> 
> > On Thu, Feb 24, 2011 at 09:18:14AM -0800, Greg KH wrote:
> > > On Thu, Feb 24, 2011 at 11:16:38AM +0200, Felipe Balbi wrote:
> > > > Hi,
> > > > 
> > > > On Thu, Feb 24, 2011 at 10:15:23AM +0100, Alexander Holler wrote:
> > > > > >On Wed, Feb 23, 2011 at 10:26:20AM -0500, Alan Stern wrote:
> > > > > >>In both cases, it appears that the problem is caused by the fact that
> > > > > >>the musb host-controller driver doesn't set the hcd->has_tt flag.
> > > > > >>
> > > > > >>Felipe, you should know where it belongs.  It should be easy enough to
> > > > > >>add.
> > > > > >
> > > > > >Sure Alan, it's attached to this mail. Compile tested only though.
> > > > > >Michael, would you care to give your tested-by ?
> > > > > 
> > > > > I can do, I'm using exactly the same patch since yesterday. ;)
> > > > > 
> > > > > Tested-by: Alexander Holler <holler@ahsoftware.de>
> > > > 
> > > > Thanks a lot Alex, Greg, can you still take this to -rc ? Do you need a
> > > > pull request or you can take this one patch ?
> > > 
> > > Wait, where does this need to go?  For the final 2.6.38 release and then
> > > also for .37-stable?
> > > 
> > > Or just .37-stable?
> > > 
> > > confused.
> > > 
> > > And no, I don't need a pull request, I can handle one patch through
> > > email :)
> > 
> > final .38 and .37-stable :-) Thanks Greg :-)
> 
> It's important that this patch appear in .37-stable at the same time as
> the $SUBJECT patch.  If that means delaying $SUBJECT for one release, 
> so be it -- it was not a very important change.

Ok, I'll drop this from the next .37-stable release until this happens.

thanks for letting me know.

greg k-h

Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Greg KH]

On Thu, Feb 24, 2011 at 10:12:46AM -0800, Greg KH wrote:
> On Thu, Feb 24, 2011 at 12:57:20PM -0500, Alan Stern wrote:
> > On Thu, 24 Feb 2011, Felipe Balbi wrote:
> > 
> > > On Thu, Feb 24, 2011 at 09:18:14AM -0800, Greg KH wrote:
> > > > On Thu, Feb 24, 2011 at 11:16:38AM +0200, Felipe Balbi wrote:
> > > > > Hi,
> > > > > 
> > > > > On Thu, Feb 24, 2011 at 10:15:23AM +0100, Alexander Holler wrote:
> > > > > > >On Wed, Feb 23, 2011 at 10:26:20AM -0500, Alan Stern wrote:
> > > > > > >>In both cases, it appears that the problem is caused by the fact that
> > > > > > >>the musb host-controller driver doesn't set the hcd->has_tt flag.
> > > > > > >>
> > > > > > >>Felipe, you should know where it belongs.  It should be easy enough to
> > > > > > >>add.
> > > > > > >
> > > > > > >Sure Alan, it's attached to this mail. Compile tested only though.
> > > > > > >Michael, would you care to give your tested-by ?
> > > > > > 
> > > > > > I can do, I'm using exactly the same patch since yesterday. ;)
> > > > > > 
> > > > > > Tested-by: Alexander Holler <holler@ahsoftware.de>
> > > > > 
> > > > > Thanks a lot Alex, Greg, can you still take this to -rc ? Do you need a
> > > > > pull request or you can take this one patch ?
> > > > 
> > > > Wait, where does this need to go?  For the final 2.6.38 release and then
> > > > also for .37-stable?
> > > > 
> > > > Or just .37-stable?
> > > > 
> > > > confused.
> > > > 
> > > > And no, I don't need a pull request, I can handle one patch through
> > > > email :)
> > > 
> > > final .38 and .37-stable :-) Thanks Greg :-)
> > 
> > It's important that this patch appear in .37-stable at the same time as
> > the $SUBJECT patch.  If that means delaying $SUBJECT for one release, 
> > so be it -- it was not a very important change.
> 
> Ok, I'll drop this from the next .37-stable release until this happens.

Oops, wait, that's going to be hard as it's already in 2.6.37.1.

Oh, I guess I can revert it for the .2 release in a few hours, and then
add it back in for .3...

I'll go do that.

thanks,

greg k-h

Re: [024/115] USB: prevent buggy hubs from crashing the USB stack

[Michael Jones]

On 02/24/2011 09:57 AM, Felipe Balbi wrote:
> Hi,
> 
> On Wed, Feb 23, 2011 at 10:26:20AM -0500, Alan Stern wrote:
>> In both cases, it appears that the problem is caused by the fact that 
>> the musb host-controller driver doesn't set the hcd->has_tt flag.
>>
>> Felipe, you should know where it belongs.  It should be easy enough to 
>> add.
> 
> Sure Alan, it's attached to this mail. Compile tested only though.
> Michael, would you care to give your tested-by ?
> 

Alexander already did, but I can do now, too.  Thanks for the fix.

Tested-by: Michael Jones <michael.jones@matrix-vision.de>

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