[SRU][F:linux-bluefield][PATCH v1 0/1] UBUNTU: SAUCE: ipmb_host.c: Fix slow transactions

[Asmaa Mnebhi]

BugLink: https://bugs.launchpad.net/bugs/1922393

SRU Justification:

[Impact]

* The previous ipmb_host patch broke the customer tests. They requested to make the ipmb_host response time as long as before. In the case where the I2C bus is made very busy, the ipmb_host driver just drops slow/delayed responses. This fix elongates the timeout of the response.
* Fixes a crash which occurs after powercycling certain BlueField-2 systems.
* The crash is due to the handshake which takes too long to wait for a response at boot time.

[Fix]

* Before executing the IPMB handshake which loads the ipmb_host driver, detect if there is a slave detected and make sure that the slave can respond.
* Free current_msg pointer right after sending the message so that sent transactions are independent of the response transactions.

[Test Case]

* soft reset
* powercycle
* run ipmitool commands
* remove and load module manually

[Regression Potential]

* The regression can be considered as low, since:
* it restores previous stable code for the customer
* and fixes a crash occurring after powercycling certain BlueField-2 systems.