8139cp WARNING: at lib/dma-debug.c:803 check_unmap+0x41a/0x650()

[Zdenek Kabelac <zdenek.kabelac@gmail.com>]

Hi

I'm getting this warning message from my kvm machine (created with
this network card -net nic,model=rtl8139)

WARNING: at lib/dma-debug.c:803 check_unmap+0x41a/0x650()

Hardware name:

8139cp 0000:00:03.0: DMA-API: device driver frees DMA memory with
different size [device address=0x000000001ebda0b2] [map size=1536
bytes] [unmap size=1538 bytes]

Modules linked in: dm_crypt crypto_blkcipher crypto_algapi loop
virtio_balloon uhci_hcd ehci_hcd dm_mod psmouse i2c_piix4 8139cp evdev
virtio_pci virtio_ring serio_raw virtio mii i2c_core usbcore rtc_cmos
rtc_core rtc_lib floppy button

Pid: 0, comm: swapper Not tainted 2.6.31-rc5-00472-g3d32107 #4

Call Trace:

 <IRQ>  [<ffffffff8104c4fb>] warn_slowpath_common+0x7b/0xc0

 [<ffffffff8104c5a1>] warn_slowpath_fmt+0x41/0x50

 [<ffffffff811e881a>] check_unmap+0x41a/0x650

 [<ffffffff8107accc>] ? trace_hardirqs_on_caller+0x7c/0x1a0

 [<ffffffff811e8ca9>] debug_dma_unmap_page+0x59/0x60

 [<ffffffffa0096ce1>] cp_rx_poll+0x301/0x550 [8139cp]

 [<ffffffff812f9050>] net_rx_action+0x170/0x270

 [<ffffffff812f8fce>] ? net_rx_action+0xee/0x270

 [<ffffffff81052e7c>] __do_softirq+0xbc/0x200

 [<ffffffff8100d2dc>] call_softirq+0x1c/0x50

 [<ffffffff8100eb65>] do_softirq+0x75/0xb0

 [<ffffffff81052935>] irq_exit+0x95/0xa0

 [<ffffffff81386001>] smp_apic_timer_interrupt+0x71/0x9c

 [<ffffffff8100ccb3>] apic_timer_interrupt+0x13/0x20

 <EOI>  [<ffffffff81014513>] ? default_idle+0x53/0xe0

 [<ffffffff81014511>] ? default_idle+0x51/0xe0

 [<ffffffff8100ae80>] ? cpu_idle+0x70/0xc0

 [<ffffffff81379eea>] ? start_secondary+0x189/0x18e

---[ end trace d222049dbdb8d58c ]---

Mapped at:

 [<ffffffff811e98a6>] debug_dma_map_page+0x86/0x170

 [<ffffffffa00965d7>] cp_init_rings+0x167/0x230 [8139cp]

 [<ffffffffa009689d>] cp_open+0xdd/0x220 [8139cp]

 [<ffffffff812f81b1>] dev_open+0xa1/0x100

 [<ffffffff812f7fe6>] dev_change_flags+0x96/0x1c0

NET: Registered protocol family 10



Zdenek