Fault-injection capability for MMC IO

configname: CONFIG_FAIL_MMC_REQUEST

Linux Kernel Configuration
└─>Fault-injection capability for MMC IO
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Provide fault-injection capability for MMC IO.
This will make the mmc core return data errors. This is
useful to test the error handling in the mmc block device
and to test how the mmc host driver handles retries from
the block device.