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Date: Wed, 21 Apr 2010 15:28:52 -0700
From: Greg KH <gregkh@...e.de>
To: Stefan Bader <stefan.bader@...onical.com>
Cc: linux-kernel@...r.kernel.org, astarikovskiy@...e.de,
ben@...adent.org.uk, len.brown@...el.com, stable@...nel.org,
stable-commits@...r.kernel.org
Subject: Re: patch acpi-ec-allow-multibyte-access-to-ec.patch added to
2.6.33-stable tree
On Wed, Apr 21, 2010 at 02:39:30PM -0700, Stefan Bader wrote:
> gregkh@...e.de wrote:
> > This is a note to let you know that we have just queued up the patch titled
> >
> > Subject: ACPI: EC: Allow multibyte access to EC
> >
> > to the 2.6.33-stable tree. Its filename is
> >
> > acpi-ec-allow-multibyte-access-to-ec.patch
> >
> > A git repo of this tree can be found at
> > http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> >
> >
> > From ben@...adent.org.uk Wed Apr 21 12:11:57 2010
> > From: Alexey Starikovskiy <astarikovskiy@...e.de>
> > Date: Sat, 10 Apr 2010 02:18:35 +0100
> > Subject: ACPI: EC: Allow multibyte access to EC
> > To: stable@...nel.org
> > Cc: Len Brown <len.brown@...el.com>, 563313@...s.debian.org, Alexey Starikovskiy <astarikovskiy@...e.de>
> > Message-ID: <1270862315.2176.69.camel@...alhost>
> >
> >
> > From: Alexey Starikovskiy <astarikovskiy@...e.de>
> >
> > commit dadf28a10c3eb29421837a2e413ab869ebd upstream
> >
> > http://bugzilla.kernel.org/show_bug.cgi?id=14667
> >
> > [bwh: Backport to 2.6.32; same applies to 2.6.33]
> >
> > Signed-off-by: Alexey Starikovskiy <astarikovskiy@...e.de>
> > Signed-off-by: Len Brown <len.brown@...el.com>
> > Cc: Ben Hutchings <ben@...adent.org.uk>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> >
> > ---
> > drivers/acpi/acpica/exprep.c | 12 ++++++++++++
> > drivers/acpi/ec.c | 35 +++++++++--------------------------
> > 2 files changed, 21 insertions(+), 26 deletions(-)
> >
> > --- a/drivers/acpi/acpica/exprep.c
> > +++ b/drivers/acpi/acpica/exprep.c
> > @@ -468,6 +468,18 @@ acpi_status acpi_ex_prep_field_value(str
> >
> > acpi_ut_add_reference(obj_desc->field.region_obj);
> >
> > + /* allow full data read from EC address space */
> > + if (obj_desc->field.region_obj->region.space_id ==
> > + ACPI_ADR_SPACE_EC) {
> > + if (obj_desc->common_field.bit_length > 8)
> > + obj_desc->common_field.access_bit_width =
> > + ACPI_ROUND_UP(obj_desc->common_field.
> > + bit_length, 8);
> > + obj_desc->common_field.access_byte_width =
> > + ACPI_DIV_8(obj_desc->common_field.
> > + access_bit_width);
> > + }
> > +
> > ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
> > "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",
> > obj_desc->field.start_field_bit_offset,
> > --- a/drivers/acpi/ec.c
> > +++ b/drivers/acpi/ec.c
> > @@ -589,12 +589,12 @@ static u32 acpi_ec_gpe_handler(void *dat
> >
> > static acpi_status
> > acpi_ec_space_handler(u32 function, acpi_physical_address address,
> > - u32 bits, acpi_integer *value,
> > + u32 bits, acpi_integer *value64,
> > void *handler_context, void *region_context)
> > {
> > struct acpi_ec *ec = handler_context;
> > - int result = 0, i;
> > - u8 temp = 0;
> > + int result = 0, i, bytes = bits / 8;
> > + u8 *value = (u8 *)value64;
> >
> > if ((address > 0xFF) || !value || !handler_context)
> > return AE_BAD_PARAMETER;
> > @@ -602,32 +602,15 @@ acpi_ec_space_handler(u32 function, acpi
> > if (function != ACPI_READ && function != ACPI_WRITE)
> > return AE_BAD_PARAMETER;
> >
> > - if (bits != 8 && acpi_strict)
> > - return AE_BAD_PARAMETER;
> > -
> > - if (EC_FLAGS_MSI)
> > + if (EC_FLAGS_MSI || bits > 8)
> > acpi_ec_burst_enable(ec);
> >
> > - if (function == ACPI_READ) {
> > - result = acpi_ec_read(ec, address, &temp);
> > - *value = temp;
> > - } else {
> > - temp = 0xff & (*value);
> > - result = acpi_ec_write(ec, address, temp);
> > - }
> > -
> > - for (i = 8; unlikely(bits - i > 0); i += 8) {
> > - ++address;
> > - if (function == ACPI_READ) {
> > - result = acpi_ec_read(ec, address, &temp);
> > - (*value) |= ((acpi_integer)temp) << i;
> > - } else {
> > - temp = 0xff & ((*value) >> i);
> > - result = acpi_ec_write(ec, address, temp);
> > - }
> > - }
> > + for (i = 0; i < bytes; ++i, ++address, ++value)
> > + result = (function == ACPI_READ) ?
> > + acpi_ec_read(ec, address, value) :
> > + acpi_ec_write(ec, address, *value);
> >
> > - if (EC_FLAGS_MSI)
> > + if (EC_FLAGS_MSI || bits > 8)
> > acpi_ec_burst_disable(ec);
> >
> > switch (result) {
> >
> >
> > Patches currently in stable-queue which might be from astarikovskiy@...e.de are
> >
> > queue-2.6.33/acpi-ec-allow-multibyte-access-to-ec.patch
> > --
> > To unsubscribe from this list: send the line "unsubscribe stable-commits" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
>
> Hi Greg,
>
> make sure to also pick the following one as it fixes a regression caused by the
> mulitbyte access patch.
>
> commit 2060c44576c79086ff24718878d7edaa7384a985
> Author: Alexey Starikovskiy <astarikovskiy@...e.de>
> Date: Fri Apr 16 15:36:40 2010 -0400
>
> ACPI: EC: Limit burst to 64 bits
Thanks, I didn't see that one.
I've now queued it up.
greg k-h
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