Hi all,
Unlike the unlink path that is called from the VFS layer, we need to
call d_delete() ourselves when a variable is deleted in
efivarfs_file_write().
Failure to do so means we can access a stale struct efivar_entry when
reading/writing the file, which can result in the following oops,
I still get an oops from Linghu Xiang's open/unlink test with this patch
applied, running on OVMF. I'll investigate further..
Cheers,
Jeremy
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