On 11/23/2011 08:43 AM, Josh Boyer wrote:
Hi,
We have a report of the pata_jmicron driver hitting the following
warning in the 3.1.x kernel series:
WARNING: at drivers/pci/search.c:44 pci_find_upstream_pcie_bridge+0x56/0x6f()
Hardware name: System Product Name
Modules linked in: pata_jmicron(+)
Pid: 256, comm: modprobe Not tainted 3.1.1-1.fc16.x86_64 #1
Call Trace:
[<ffffffff81057a1e>] warn_slowpath_common+0x83/0x9b
[<ffffffff81057a50>] warn_slowpath_null+0x1a/0x1c
[<ffffffff81241643>] pci_find_upstream_pcie_bridge+0x56/0x6f
[<ffffffff814b45d4>] get_domain_for_dev.part.9.constprop.13+0x2e/0x47f
[<ffffffff814b4bf9>] __get_valid_domain_for_dev+0x2c/0xa0
[<ffffffff813c1ca3>] __intel_map_single+0x5a/0x172
[<ffffffff811103e8>] ? alloc_pages_current+0xc7/0xd8
[<ffffffff813c1eb7>] intel_alloc_coherent+0xc7/0xee
[<ffffffff812e7612>] ? dmam_noncoherent_release+0x1b/0x1b
[<ffffffff812e757c>] dma_alloc_coherent+0x80/0x82
[<ffffffff812e7721>] dmam_alloc_coherent+0x58/0x9c
[<ffffffff81317e88>] ata_bmdma_port_start+0x43/0x58
[<ffffffff81309ef6>] ata_host_start+0xdd/0x168
[<ffffffff813184fd>] ? __ata_sff_interrupt+0x179/0x179
[<ffffffff81318709>] ata_pci_sff_activate_host+0x36/0x1e0
[<ffffffff813c2b1f>] ? pcibios_set_master+0x88/0x8f
[<ffffffff81318bc7>] ata_pci_bmdma_init_one+0xc2/0xf8
[<ffffffffa0000032>] jmicron_init_one+0x32/0x34 [pata_jmicron]
[<ffffffff8123fce7>] local_pci_probe+0x44/0x75
[<ffffffff8124084a>] pci_device_probe+0xd0/0xff
[<ffffffff812dea17>] driver_probe_device+0x131/0x213
[<ffffffff812deb53>] __driver_attach+0x5a/0x7e
[<ffffffff812deaf9>] ? driver_probe_device+0x213/0x213
[<ffffffff812dda9f>] bus_for_each_dev+0x53/0x89
[<ffffffff812de5f6>] driver_attach+0x1e/0x20
[<ffffffff812de21a>] bus_add_driver+0xd1/0x224
[<ffffffffa0002000>] ? 0xffffffffa0001fff
[<ffffffff812deff7>] driver_register+0x98/0x105
[<ffffffffa0002000>] ? 0xffffffffa0001fff
[<ffffffff8124110d>] __pci_register_driver+0x56/0xc1
[<ffffffffa0002000>] ? 0xffffffffa0001fff
[<ffffffffa000201e>] jmicron_init+0x1e/0x20 [pata_jmicron]
[<ffffffff81002099>] do_one_initcall+0x7f/0x136
[<ffffffff8108a595>] sys_init_module+0x88/0x1d0
[<ffffffff814bd8c2>] system_call_fastpath+0x16/0x1b
That boils down to the following check:
/* PCI device should connect to a PCIe bridge */
if (pdev->pcie_type != PCI_EXP_TYPE_PCI_BRIDGE) {
/* Busted hardware? */
WARN_ON_ONCE(1);
return NULL;
}
I don't recall seeing reports of this on the 3.0 kernel. Should we add
some debugging code to print out what pdev->pcie_type is set to here?
Without knowing that, I can't tell if it's actually finding something weird
about the hardware, or memory corruption that seems to hit here.
The user has hit it about 3 times thus far, so they can at least recreate
it fairly easily.
Any other ideas?
Well, I don't think it has anything to do with the driver. It seems like
the code is trying to go from the PCI device up the chain of PCI bridges
until it finds a PCI-E device that's a bridge. The warning indicates
that the first PCI-E device it found didn't seem to be a bridge.
Can we get the output of "lspci -vv" on this machine?
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