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[Launchpad Bug Tracker <1939855@xxxxxxxxxxxxxxxxxx>]

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[Impact]

When we run the command, ethtool -d <interface_name> with Intel cards (ice driver), the kernel crashes because of the ice driver.
The same works fine with HWE kernel (5.11). Here, we do not see any crash.

[FIXES]

ice: Fix bad register reads
The "ethtool -d" handler reads registers in the ice_regs_dump_list array
and returns read values back to the userspace.

commitID:  1fba4a8a92706c89716449b1aab1b6879f438d34

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-
next.git/commit/drivers/net/ethernet/intel/ice?id=1fba4a8a92706c89716449b1aab1b6879f438d34

[TESTING]

Install Focal on a system with an E810 network device.
Ensure the network device has an IP address and has connectivity
Run ethtool -d <interface_name>
Expected result: Prints a register dump for the specified network device

[REGRESSION RISK]

The regression risk is low

[OTHER INFO]

I have added the fix, built the kernel and tested the fix.

https://code.launchpad.net/~mreed8855/ubuntu/+source/linux/+git/focal/+ref/e810_ethtool_fix_next

** Affects: ubuntu-translations
     Importance: Undecided
         Status: Incomplete

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Focal)
     Importance: High
         Status: Fix Released


** Tags: focal verification-done-focal
-- 
[SRU] Ice driver causes the kernel to crash with Ubuntu 20.04.2 with ethtool specific register commands
https://bugs.launchpad.net/bugs/1939855
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