On Thu, 30 Mar 2017, Oliver Neukum wrote:
> Am Donnerstag, den 30.03.2017, 11:55 -0400 schrieb Alan Stern:
> >
> > I'm pretty sure that usb-storage does not do this, at least, not when
> > operating in its normal Bulk-Only-Transport mode. It never tries to
> > read the results of an earlier tr
Am Donnerstag, den 30.03.2017, 11:55 -0400 schrieb Alan Stern:
>
> I'm pretty sure that usb-storage does not do this, at least, not when
> operating in its normal Bulk-Only-Transport mode. It never tries to
> read the results of an earlier transfer after carrying out a later
> transfer to any
Hi Alan,
On Thursday 30 Mar 2017 11:55:18 Alan Stern wrote:
> On Thu, 30 Mar 2017, Mauro Carvalho Chehab wrote:
> > Em Thu, 30 Mar 2017 10:26:32 -0400 (EDT) Alan Stern escreveu:
> >> On Thu, 30 Mar 2017, Oliver Neukum wrote:
> Btw, I'm a lot more concerned about USB storage drivers. When I wa
On Thu, 30 Mar 2017, Mauro Carvalho Chehab wrote:
> Em Thu, 30 Mar 2017 10:26:32 -0400 (EDT)
> Alan Stern escreveu:
>
> > On Thu, 30 Mar 2017, Oliver Neukum wrote:
> >
> > > > Btw, I'm a lot more concerned about USB storage drivers. When I was
> > > > discussing about this issue at the #raspber
Em Thu, 30 Mar 2017 10:26:32 -0400 (EDT)
Alan Stern escreveu:
> On Thu, 30 Mar 2017, Oliver Neukum wrote:
>
> > > Btw, I'm a lot more concerned about USB storage drivers. When I was
> > > discussing about this issue at the #raspberrypi-devel IRC channel,
> > > someone complained that, after swit
On Thu, 30 Mar 2017, Oliver Neukum wrote:
> > Btw, I'm a lot more concerned about USB storage drivers. When I was
> > discussing about this issue at the #raspberrypi-devel IRC channel,
> > someone complained that, after switching from the RPi downstream Kernel
> > to upstream, his USB data storage
Am Donnerstag, den 30.03.2017, 07:28 -0300 schrieb Mauro Carvalho
Chehab:
> Em Thu, 30 Mar 2017 12:34:32 +0300
> Laurent Pinchart escreveu:
>
> >
Hi,
> > > That effectively changes the API. Many network drivers are written with
> > > the assumption that any contiguous buffer is valid. In fact
Em Thu, 30 Mar 2017 15:05:30 +0300
Laurent Pinchart escreveu:
> Hi Mauro,
>
> On Thursday 30 Mar 2017 07:28:00 Mauro Carvalho Chehab wrote:
> > Em Thu, 30 Mar 2017 12:34:32 +0300 Laurent Pinchart escreveu:
> > > On Thursday 30 Mar 2017 10:11:31 Oliver Neukum wrote:
> > >> Am Donnerstag, den
Hi Mauro,
On Thursday 30 Mar 2017 07:28:00 Mauro Carvalho Chehab wrote:
> Em Thu, 30 Mar 2017 12:34:32 +0300 Laurent Pinchart escreveu:
> > On Thursday 30 Mar 2017 10:11:31 Oliver Neukum wrote:
> >> Am Donnerstag, den 30.03.2017, 01:15 +0300 schrieb Laurent Pinchart:
> + may also override P
From: Mauro Carvalho Chehab
> Sent: 30 March 2017 11:28
...
> While debugging this issue, I saw *a lot* of network-generated URB
> traffic from RPi3 Ethernet port drivers that were using non-aligned
> buffers and were subject to the temporary buffer conversion.
Buffers from the network stack will
Em Thu, 30 Mar 2017 12:38:42 +0300
Laurent Pinchart escreveu:
> Hi Mauro,
>
> On Wednesday 29 Mar 2017 22:06:33 Mauro Carvalho Chehab wrote:
> > Em Thu, 30 Mar 2017 01:15:27 +0300 Laurent Pinchart escreveu:
> > > On Wednesday 29 Mar 2017 15:54:21 Mauro Carvalho Chehab wrote:
> > > > Several
Em Thu, 30 Mar 2017 12:34:32 +0300
Laurent Pinchart escreveu:
> Hi Oliver,
>
> On Thursday 30 Mar 2017 10:11:31 Oliver Neukum wrote:
> > Am Donnerstag, den 30.03.2017, 01:15 +0300 schrieb Laurent Pinchart:
> > > > + may also override PAD bytes at the end of the ``transfer_buffer``,
> > > > u
Hi Mauro,
On Wednesday 29 Mar 2017 22:06:33 Mauro Carvalho Chehab wrote:
> Em Thu, 30 Mar 2017 01:15:27 +0300 Laurent Pinchart escreveu:
> > On Wednesday 29 Mar 2017 15:54:21 Mauro Carvalho Chehab wrote:
> > > Several host controllers, commonly found on ARM, like dwc2,
> > > require buffers that a
Hi Oliver,
On Thursday 30 Mar 2017 10:11:31 Oliver Neukum wrote:
> Am Donnerstag, den 30.03.2017, 01:15 +0300 schrieb Laurent Pinchart:
> > > + may also override PAD bytes at the end of the ``transfer_buffer``,
> > > up to the
> > > + size of the CPU word.
> >
> > "May" is quite weak here. If
Am Donnerstag, den 30.03.2017, 01:15 +0300 schrieb Laurent Pinchart:
> > + may also override PAD bytes at the end of the ``transfer_buffer``, up to
> > the
> > + size of the CPU word.
>
> "May" is quite weak here. If some host controller drivers require buffers to
> be aligned, then it's an A
Em Thu, 30 Mar 2017 01:15:27 +0300
Laurent Pinchart escreveu:
> Hi Mauro,
>
> Thank you for the patch.
>
> On Wednesday 29 Mar 2017 15:54:21 Mauro Carvalho Chehab wrote:
> > Several host controllers, commonly found on ARM, like dwc2,
> > require buffers that are CPU-word aligned for they to wor
Hi Mauro,
Thank you for the patch.
On Wednesday 29 Mar 2017 15:54:21 Mauro Carvalho Chehab wrote:
> Several host controllers, commonly found on ARM, like dwc2,
> require buffers that are CPU-word aligned for they to work.
>
> Failing to do that will cause random troubles at the caller
> drivers,
Several host controllers, commonly found on ARM, like dwc2,
require buffers that are CPU-word aligned for they to work.
Failing to do that will cause random troubles at the caller
drivers, causing them to fail.
Document it.
Signed-off-by: Mauro Carvalho Chehab
---
Documentation/driver-api/usb/
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