vchiq_test: expected callback reason VCHIQ_BULK_TRANSMIT_DONE, got 5

[lategoodbye]

Is this the right place for my bug report?
AFAIU this is more likely a kernel issue than a userspace one.

Describe the bug
If i try to run the functional test of vchiq_test on latest Raspberry Pi OS (64 bit), it aborts with an error.

To reproduce
If i try to run vchiq_test -f 1, i got the following error:
======== iteration 1 ========
vchiq_test: 1540: expected callback reason VCHIQ_BULK_TRANSMIT_DONE, got 5
vchiq_test: 856: func_error != 0

Expected behaviour
vchiq_test should succeed without any error.

Actual behaviour
The functional test of vchiq_test aborts with an error.

System
Copy and paste the results of the raspinfo command in to this section. Alternatively, copy and paste a pastebin link, or add answers to the following questions:

• Which model of Raspberry Pi? Raspberry Pi 4 (4 and 8 GB)
• Which OS and version (cat /etc/rpi-issue)? Raspberry Pi OS (64 bit) (2020-05-27-raspios-buster-arm64)
• Which firmware version (vcgencmd version)? 2020-05-27 12:05 / 369ed4e44cb5a080a2dfa7f854ae4ff46b7c9ef9
• Which kernel version (uname -a)? Linux version 5.4.42-v8+ (dom@buildbot) (gcc version 5.4.0 20160609 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9)) kexec new kernel freeze after show Starting new kernel #1319 SMP PREEMPT Wed May 20 14:18:56 BST 2020

[pelwell]

This bug is already fixed in the current rpi-5.4.y branch by commits d8cbdaa ("staging: vchiq_arm: Clean up 40-bit DMA support") and 79495a5 ("ARM: dts: Update for new VCHIQ BCM2711 DMA support").

[lategoodbye]

Okay, i will test as it's available via rpi-update.

[lategoodbye]

I will retest after this commit is included. The kernel 5.4.44 crashes using vchiq_test.