On 09/10/2019 06:12 AM, Kalle Valo wrote:
greearb@xxxxxxxxxxxxxxx wrote:
My wave-1 firmware often crashes when I am bringing down
AP vdevs, and sometimes at least some machines lockup hard
after spewing IOMMU errors.
I don't see the same issue in STA mode, so I suspect beacons
are the issue.
Moving the beacon buf deletion to later in the vdev teardown
logic appears to help this problem. Firmware still crashes
often, but several iterations did not show IOMMU errors and
machine didn't hang.
I'm not really fond of fixing issues just by luck but after a quick look at the
code I can't see any harm in this change either. So I guess it's ok.
But can you provide the exact hardware and firmware you used for testing, I'll
add it to the commit log. I want to document that in every commit:
I used Compex WLE900VX hardware, and the firmware was ath10k-ct something or other,
it has been a long time, so I don't recall the exact firmware version.
The real fix for this is to have the firmware do proper beacon tx completion
logic so that the driver can know when it can safely free buffers. I implemented
this in my ath10k-ct firmware/driver, but unless you want to start accepting patches for my
firmware, then that will not help upstream ath10k.
Thanks,
Ben
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
