[PATCH AUTOSEL 4.14 57/73] MD: fix invalid stored role for a disk

From: Shaohua Li [ Upstream commit d595567dc4f0c1d90685ec1e2e296e2cad2643ac ] If we change the number of array's device after device is removed from array, then add the device back to array, we can see that device is added as active role instead of spare which we expected. Please see the below

[PATCH AUTOSEL 4.14 57/73] MD: fix invalid stored role for a disk

From: Shaohua Li [ Upstream commit d595567dc4f0c1d90685ec1e2e296e2cad2643ac ] If we change the number of array's device after device is removed from array, then add the device back to array, we can see that device is added as active role instead of spare which we expected. Please see the below