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Date: Fri, 13 Jun 2008 11:23:16 -0600
From: Bjorn Helgaas <bjorn.helgaas@...com>
To: Jiri Slaby <jirislaby@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org
Subject: Re: pnp changes -> suspend oops [Was: 2.6.26-rc5-mm2]
On Friday 13 June 2008 10:05:00 am Jiri Slaby wrote:
> On 06/12/2008 11:57 PM, Bjorn Helgaas wrote:
> > On Thursday 12 June 2008 03:39:14 pm Jiri Slaby wrote:
> >> On 06/12/2008 11:22 PM, Bjorn Helgaas wrote:
> >>> On Thursday 12 June 2008 03:10:04 pm Jiri Slaby wrote:
> >>>> On 06/11/2008 09:03 PM, Bjorn Helgaas wrote:
> >>>>> Before you go to all the trouble of bisecting it, can you turn on
> >>>>> CONFIG_PNP_DEBUG and try the following debug patch? I think this
> >>>>> will prevent the oops, but it's just papering over the real problem,
> >>>>> so please capture the complete dmesg log.
> >>>> ACPI: PCI interrupt for device 0000:00:02.0 disabled
> >>>> serial 00:07: disabled
> >>>> serial 00:06: disabled
> >>>> ACPI handle has no context!
> >>>> ACPI: PCI interrupt for device 0000:00:1d.7 disabled
> >>>> ...
> >>>> serial 00:06: no dma resource to encode!
> >>>> serial 00:06: activated
> >>>> serial 00:07: no dma resource to encode!
> >>>> serial 00:07: activated
> >>>> ACPI: PCI Interrupt 0000:00:02.0[A] -> GSI 16 (level, low) -> IRQ 16
> >>> Interesting. I wonder why a serial device would have a DMA resource.
> >>> We encode resources by following a template from _CRS, so evidently
> >>> that template had a DMA resource. Or something deeper is wrong.
> >>>
> >>> Can you send me the rest of that dmesg log?
> >> Below.
> >
> > Thanks, but it looks like CONFIG_PNP_DEBUG is not turned on. Can
> > you turn that on and capture the log again, please?
>
> Here it goes:
Thanks a lot! Your BIOS clearly claims that at least one of your
serial ports can be configured with DMA:
pnp 00:07: dependent set 5 (acceptable) io min 0x3f8 max 0x3f8 align 1 size 8 flags 0x1
pnp 00:07: dependent set 5 (acceptable) irq 3 4 5 6 7 10 11 12 flags 0x1
pnp 00:07: dependent set 5 (acceptable) dma 0 1 2 3 (bitmask 0xf) flags 0x0
That's wierd, but whatever, we still have to be careful to give the
BIOS back what it expects, and I think that means we have to keep
track of that disabled DMA resource in pnpacpi_allocated_resource().
Can you please replace the debug patch with the one below and send me
the results again?
Index: work10/drivers/pnp/pnpacpi/rsparser.c
===================================================================
--- work10.orig/drivers/pnp/pnpacpi/rsparser.c 2008-06-11 12:46:28.000000000 -0600
+++ work10/drivers/pnp/pnpacpi/rsparser.c 2008-06-13 11:13:21.000000000 -0600
@@ -240,6 +240,7 @@ static acpi_status pnpacpi_allocated_res
struct acpi_resource_fixed_memory32 *fixed_memory32;
struct acpi_resource_extended_irq *extended_irq;
int i, flags;
+ u8 channel;
switch (res->type) {
case ACPI_RESOURCE_TYPE_IRQ:
@@ -259,13 +260,13 @@ static acpi_status pnpacpi_allocated_res
case ACPI_RESOURCE_TYPE_DMA:
dma = &res->data.dma;
- if (dma->channel_count > 0) {
- flags = dma_flags(dma->type, dma->bus_master,
- dma->transfer);
- if (dma->channels[0] == (u8) -1)
- flags |= IORESOURCE_DISABLED;
- pnp_add_dma_resource(dev, dma->channels[0], flags);
+ channel = dma->channels[0];
+ flags = dma_flags(dma->type, dma->bus_master, dma->transfer);
+ if (dma->channel_count == 0 || dma->channels[0] == (u8) -1) {
+ channel = -1;
+ flags = IORESOURCE_DISABLED;
}
+ pnp_add_dma_resource(dev, channel, flags);
break;
case ACPI_RESOURCE_TYPE_IO:
@@ -749,6 +750,11 @@ static void pnpacpi_encode_irq(struct pn
struct acpi_resource_irq *irq = &resource->data.irq;
int triggering, polarity, shareable;
+ if (!p) {
+ dev_err(&dev->dev, " no irq resource to encode!\n");
+ return;
+ }
+
decode_irq_flags(dev, p->flags, &triggering, &polarity, &shareable);
irq->triggering = triggering;
irq->polarity = polarity;
@@ -771,6 +777,11 @@ static void pnpacpi_encode_ext_irq(struc
struct acpi_resource_extended_irq *extended_irq = &resource->data.extended_irq;
int triggering, polarity, shareable;
+ if (!p) {
+ dev_err(&dev->dev, " no extended irq resource to encode!\n");
+ return;
+ }
+
decode_irq_flags(dev, p->flags, &triggering, &polarity, &shareable);
extended_irq->producer_consumer = ACPI_CONSUMER;
extended_irq->triggering = triggering;
@@ -791,6 +802,11 @@ static void pnpacpi_encode_dma(struct pn
{
struct acpi_resource_dma *dma = &resource->data.dma;
+ if (!p) {
+ dev_err(&dev->dev, " no dma resource to encode!\n");
+ return;
+ }
+
/* Note: pnp_assign_dma will copy pnp_dma->flags into p->flags */
switch (p->flags & IORESOURCE_DMA_SPEED_MASK) {
case IORESOURCE_DMA_TYPEA:
@@ -832,6 +848,11 @@ static void pnpacpi_encode_io(struct pnp
{
struct acpi_resource_io *io = &resource->data.io;
+ if (!p) {
+ dev_err(&dev->dev, " no io resource to encode!\n");
+ return;
+ }
+
/* Note: pnp_assign_port will copy pnp_port->flags into p->flags */
io->io_decode = (p->flags & IORESOURCE_IO_16BIT_ADDR) ?
ACPI_DECODE_16 : ACPI_DECODE_10;
@@ -851,6 +872,11 @@ static void pnpacpi_encode_fixed_io(stru
{
struct acpi_resource_fixed_io *fixed_io = &resource->data.fixed_io;
+ if (!p) {
+ dev_err(&dev->dev, " no fixed io resource to encode!\n");
+ return;
+ }
+
fixed_io->address = p->start;
fixed_io->address_length = p->end - p->start + 1;
@@ -864,6 +890,11 @@ static void pnpacpi_encode_mem24(struct
{
struct acpi_resource_memory24 *memory24 = &resource->data.memory24;
+ if (!p) {
+ dev_err(&dev->dev, " no mem24 resource to encode!\n");
+ return;
+ }
+
/* Note: pnp_assign_mem will copy pnp_mem->flags into p->flags */
memory24->write_protect =
(p->flags & IORESOURCE_MEM_WRITEABLE) ?
@@ -884,6 +915,11 @@ static void pnpacpi_encode_mem32(struct
{
struct acpi_resource_memory32 *memory32 = &resource->data.memory32;
+ if (!p) {
+ dev_err(&dev->dev, " no mem32 resource to encode!\n");
+ return;
+ }
+
memory32->write_protect =
(p->flags & IORESOURCE_MEM_WRITEABLE) ?
ACPI_READ_WRITE_MEMORY : ACPI_READ_ONLY_MEMORY;
@@ -903,6 +939,11 @@ static void pnpacpi_encode_fixed_mem32(s
{
struct acpi_resource_fixed_memory32 *fixed_memory32 = &resource->data.fixed_memory32;
+ if (!p) {
+ dev_err(&dev->dev, " no fixed_mem32 resource to encode!\n");
+ return;
+ }
+
fixed_memory32->write_protect =
(p->flags & IORESOURCE_MEM_WRITEABLE) ?
ACPI_READ_WRITE_MEMORY : ACPI_READ_ONLY_MEMORY;
--
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