Bug:HSUART May Stop Functioning When DMA is Activated

[micas-net]

Is it platform specific

generic

Importance or Severity

High

Description of the bug

Intel C3000 CPU report a err，there is a possibility that the serial port function will be abnormal and the CPU will hang.

Steps to Reproduce

When constructing a large amount of serial port data, perform device restart and stability testing.

Actual Behavior and Expected Behavior

Actual Behavior：The serial port will not respond and the CPU will hang.

Expected Behavior：The serial port functions normally and the system runs normally

[micas-net]

This issue fixes by sonic-net/sonic-linux-kernel#476

[judyjoseph]

@saiarcot895 could you take a look at this issue and linux kernel PR ?