UART Baud rate change code flow

UART Baud rate change code flow

[Pankaj Bansal]

Hello Edk2 team,

We are trying to change the UART Baud rate dynamically from UEFI shell using "sermode" command in our ARM64 based platform.
I see the code flow of sermode call as below :

ShellCommandRunSerMode() ->	SerialSetAttributes() ->			SerialPortSetAttributes()
                                                          	SerialSetAttributes() <-
					TerminalDriverBindingStart() ->		SerialSetAttributes()  ->		SerialPortSetAttributes() 
					TerminalDriverBindingStart() <-		SerialSetAttributes()  <- 
					TerminalConInReset() ->		SerialReset () ->			 SerialPortInitialize()
					TerminalConInReset() <-		SerialReset() <- 
					TerminalConInTimerHandler() ->	SerialSetAttributes() -> 		SerialPortSetAttributes() 
					TerminalConInTimerHandler() <- 	SerialSetAttributes()
ShellCommandRunSerMode() <-

I am not able to understand why SerialSetAttributes and SerialReset are being called, while the first call to SerialSetAttributes has not yet completed.
Is this code flow right ? am I missing something ?

Thanks & Regards,
Pankaj Bansal