On 12/23/14 19:26, kott wrote:
Hello -
I am seeing this fault when i plugin a external usb device, and was
wondering if this indicates DMA/Cache coherency problem
-----
_ehci_append_qh: 0xf3dd2300 to 0xf3dc3c00
Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex ehci0 (usb_def_mtx) r = 0 (0xc73ece74) locked @
sys/dev/usb/usb_transfer.c
exclusive sleep mutex USB device mutex (USB device mutex) r = 0 (0xc73da850)
locked @ /sys/dev/usb/usb_transfer.c
Stopped at usb_pc_cpu_flush+0xc: ldr r2, [r0, #0x018]
----------------------------
Thanks
kott
Hi,
The flush is supposed to call some other functions which write the
memory cache to RAM. It should not panic like that. Can you get the
complete backtrace. I guess that some memory content might have been
lost due to missing or wrong cache sync operations. What is the value of
"r0" ?
--HPS
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