[BUG] cardbus/hotplugging still broken in 2.5.56

[BUG] cardbus/hotplugging still broken in 2.5.56

[Mikael Pettersson]

Cardbus/hotplugging is still broken in 2.5.56. Inserting a
card fails due a bogus 'resource conflict', and ejecting it
oopses the kernel. It's been this way since 2.5.4x-something.

Dell Latitude, Texas PCI1131 cardbus bridge, 3c575_cb NIC.

Early boot log:

Linux Kernel Card Services 3.1.22
  options:  [pci] [cardbus] [pm]
PCI: Found IRQ 11 for device 00:03.0
PCI: Sharing IRQ 11 with 00:03.1
PCI: Sharing IRQ 11 with 00:07.2
PCI: Found IRQ 11 for device 00:03.1
PCI: Sharing IRQ 11 with 00:03.0
PCI: Sharing IRQ 11 with 00:07.2
...
Yenta IRQ list 0618, PCI irq11
Socket status: 30000006
Yenta IRQ list 0618, PCI irq11
Socket status: 30000006
...
cs: IO port probe 0x0c00-0x0cff: clean.
cs: IO port probe 0x0100-0x04ff: excluding 0x210-0x217 0x220-0x22f 0x378-0x37f 0x388-0x38f 0x3c0-0x3df 0x4d0-0x4d7
cs: IO port probe 0x0a00-0x0aff: clean.

So far so good.
Now insert the 3x575_cb NIC:

cs: cb_alloc(bus 5): vendor 0x10b7, device 0x5057
PCI: Device 05:00.0 not available because of resource collisions

Now eject the NIC:

Unable to handle kernel NULL pointer dereference at virtual address 00000004
 printing eip:
c019cd1b
*pde = 00000000
Oops: 0002
CPU:    0
EIP:    0060:[<c019cd1b>]    Not tainted
EFLAGS: 00010246
EIP is at device_del+0x23/0x74
eax: 00000000   ebx: c7eff44c   ecx: c02b2048   edx: 00000000
esi: c7f6d44c   edi: c7eff400   ebp: c7ef2000   esp: c7fb7f0c
ds: 007b   es: 007b   ss: 0068
Process events/0 (pid: 3, threadinfo=c7fb6000 task=c1150c80)
Stack: c7eff44c 00000000 c019cd77 c7eff44c c7eff400 c01970a6 c7eff44c c7eff400 
       c01e5356 c7eff400 c7ef2000 c7ef2000 c01e72e0 c7feb7e0 c01e277a c7ef2000 
       c7ef2000 c7ef2000 c7ef200c c7ef2000 00000080 c01e72e0 c7feb7e0 c01e2aa5 
Call Trace:
 [<c019cd77>] device_unregister+0xb/0x16
 [<c01970a6>] pci_remove_device+0xe/0x38
 [<c01e5356>] cb_free+0x2a/0x60
 [<c01e72e0>] yenta_bh+0x0/0x24
 [<c01e277a>] shutdown_socket+0x76/0xe0
 [<c01e72e0>] yenta_bh+0x0/0x24
 [<c01e2aa5>] do_shutdown+0x5d/0x64
 [<c01e2ae6>] parse_events+0x3a/0xd8
 [<c01e72fe>] yenta_bh+0x1e/0x24
 [<c011fbbd>] worker_thread+0x18d/0x240
 [<c011fa30>] worker_thread+0x0/0x240
 [<c01e72e0>] yenta_bh+0x0/0x24
 [<c01136a4>] default_wake_function+0x0/0x34
 [<c01136a4>] default_wake_function+0x0/0x34
 [<c0106ddd>] kernel_thread_helper+0x5/0xc

Code: 89 50 04 89 02 89 1b 89 5b 04 ff 05 48 20 2b c0 7e 73 8d 76 

Doubleplusuncool.

/Mikael

Re: [BUG] cardbus/hotplugging still broken in 2.5.56

[John Bradford]

> Cardbus/hotplugging is still broken in 2.5.56. Inserting a
> card fails due a bogus 'resource conflict', and ejecting it
> oopses the kernel. It's been this way since 2.5.4x-something.

This is a known issue, somebody else reported it to the mailing list
yesterday, and I've put it in my bug db:

http://grabjohn.com/kernelbugdatabase/index.php?action=21&id=18

John.

Re: [BUG] cardbus/hotplugging still broken in 2.5.56

[Zwane Mwaikambo]

yOn Sat, 11 Jan 2003, Mikael Pettersson wrote:

> Cardbus/hotplugging is still broken in 2.5.56. Inserting a
> card fails due a bogus 'resource conflict', and ejecting it
> oopses the kernel. It's been this way since 2.5.4x-something.
> 
> Dell Latitude, Texas PCI1131 cardbus bridge, 3c575_cb NIC.

I think its a matter of resource collisions only and the oops is 
inadequate cleanup on failure. I've tested cardbus/hotplugging on a TI PCI1211 and 
Tulip 21142 based NIC. Perhaps find the last working kernel?

	Zwane
-- 
function.linuxpower.ca

Re: [BUG] cardbus/hotplugging still broken in 2.5.56

[Bas Vermeulen]

On Sat, 11 Jan 2003, Zwane Mwaikambo wrote:

> yOn Sat, 11 Jan 2003, Mikael Pettersson wrote:
> 
> > Cardbus/hotplugging is still broken in 2.5.56. Inserting a
> > card fails due a bogus 'resource conflict', and ejecting it
> > oopses the kernel. It's been this way since 2.5.4x-something.
> > 
> > Dell Latitude, Texas PCI1131 cardbus bridge, 3c575_cb NIC.
> 
> I think its a matter of resource collisions only and the oops is 
> inadequate cleanup on failure. I've tested cardbus/hotplugging on a TI PCI1211 and 
> Tulip 21142 based NIC. Perhaps find the last working kernel?

I've got the same problem as the one above, with a Realtek rtl8139.
The problem I'm seeing is that 

dev->resource[0].start == 0x00000000 and dev->resource[0].end == 0xff

which will not jive with various checks in pcibios_enable_device()

It's still working in 2.4.21-pre3, and the last kernel I was able to boot 
succesfully was 2.5.48, although I know for a fact that 2.5.54 already had 
the problem. 

Hardware on my laptop (Inspiron 8000) is a TI PCI1445 cardbus bridge.

Bas Vermeulen

-- 
"God, root, what is difference?" 
	-- Pitr, User Friendly

"God is more forgiving." 
	-- Dave Aronson

Re: [BUG] cardbus/hotplugging still broken in 2.5.56

[Mikael Pettersson]

Zwane Mwaikambo writes:
 > yOn Sat, 11 Jan 2003, Mikael Pettersson wrote:
 > 
 > > Cardbus/hotplugging is still broken in 2.5.56. Inserting a
 > > card fails due a bogus 'resource conflict', and ejecting it
 > > oopses the kernel. It's been this way since 2.5.4x-something.
 > > 
 > > Dell Latitude, Texas PCI1131 cardbus bridge, 3c575_cb NIC.
 > 
 > I think its a matter of resource collisions only and the oops is 
 > inadequate cleanup on failure. I've tested cardbus/hotplugging on a TI PCI1211 and 
 > Tulip 21142 based NIC. Perhaps find the last working kernel?

I did some tests yesterday, and 2.5.49 was the last kernel to work at all:
boot, insert NIC, and it goes up. But the last few 2.5.4x all seemed to
handle ejection incorrectly: ejecting and reinserting the NIC did _not_
successfully enable it, and manually down/up eth0 didn't help.

/Mikael

Re: [BUG] cardbus/hotplugging still broken in 2.5.56

[Jens Taprogge]

[-- Attachment #1: Type: text/plain, Size: 551 bytes --]

The cardbus problems are caused by 

ChangeSet@1.797.145.6  2002-11-25 18:31:10-08:00 davej@codemonkey.org.uk

as far as I can tell. 

pci_enable_device() will fail at least on i386 (see
arch/i386/pci/i386.c: pcibios_enable_resource (line 260)) if the
resources have not been assigned previously. Hence the ostensible
resource collisions.

The attached patch should fix the problem.

I have send the patch to Dave Jones some time ago but did not hear from
him yet.

I am not subscribed to the list so please cc me on replys. 

Jens

-- 
Jens Taprogge

[-- Attachment #2: cardbus_fix_2.5.52.patch --]
[-- Type: text/plain, Size: 1498 bytes --]

diff -ur linux-2.5.51/drivers/pcmcia/cardbus.c linux-2.5.51_jlt/drivers/pcmcia/cardbus.c
--- linux-2.5.51/drivers/pcmcia/cardbus.c	2002-12-10 03:45:52.000000000 +0100
+++ linux-2.5.51_jlt/drivers/pcmcia/cardbus.c	2002-12-10 22:19:46.000000000 +0100
@@ -229,6 +229,17 @@
     
 =====================================================================*/
 
+static void cb_free_resources(struct pci_dev *dev)
+{
+	int i;
+
+	for (i = 0; i < 7; i++) {
+		struct resource *res = dev->resource + i;
+		if (res->parent)
+			release_resource(res);
+	}
+}
+
 int cb_alloc(socket_info_t * s)
 {
 	struct pci_bus *bus;
@@ -283,25 +294,31 @@
 		dev->hdr_type = hdr & 0x7f;
 
 		pci_setup_device(dev);
-		if (pci_enable_device(dev))
-			continue;
 
 		strcpy(dev->dev.bus_id, dev->slot_name);
 
 		/* FIXME: Do we need to enable the expansion ROM? */
 		for (r = 0; r < 7; r++) {
 			struct resource *res = dev->resource + r;
-			if (res->flags)
-				pci_assign_resource(dev, r);
+			if (res->flags && pci_assign_resource(dev, r) < 0) {
+				cb_free_resources(dev);
+				continue;
+			}
 		}
 
 		/* Does this function have an interrupt at all? */
 		pci_readb(dev, PCI_INTERRUPT_PIN, &irq_pin);
-		if (irq_pin) {
+		if (irq_pin)
 			dev->irq = irq;
-			pci_writeb(dev, PCI_INTERRUPT_LINE, irq);
+
+		if (pci_enable_device(dev)) {
+			cb_free_resources(dev);
+			continue;
 		}
 
+		if (irq_pin)
+			pci_writeb(dev, PCI_INTERRUPT_LINE, irq);
+		
 		device_register(&dev->dev);
 		pci_insert_device(dev, bus);
 	}

Re: [BUG] cardbus/hotplugging still broken in 2.5.56

[Mikael Pettersson]

Jens Taprogge writes:
 > The cardbus problems are caused by 
 > 
 > ChangeSet@1.797.145.6  2002-11-25 18:31:10-08:00 davej@codemonkey.org.uk
 > 
 > as far as I can tell. 
 > 
 > pci_enable_device() will fail at least on i386 (see
 > arch/i386/pci/i386.c: pcibios_enable_resource (line 260)) if the
 > resources have not been assigned previously. Hence the ostensible
 > resource collisions.
 > 
 > The attached patch should fix the problem.
 > 
 > I have send the patch to Dave Jones some time ago but did not hear from
 > him yet.
 > 
 > I am not subscribed to the list so please cc me on replys. 

Thanks. Your patch fixed the cardbus hotplug issue perfectly on my laptop.
It survives multiple insert/eject cycles without any problems.

The patch posted by Yaacov Akiba Slama today also fixed cardbus hotplug
for me, but with his patch the kernel still prints "PCI: No IRQ known for
interrupt pin A of device xx:xx.x. Please try using pci=biosirq" when the
cardbus NIC is inserted; Jens Taprogge's patch silenced that warning.

/Mikael