On Tue, 2018-07-10 at 20:24 +0200, Greg Kroah-Hartman wrote:
4.4-stable review patch. If anyone has any objections, please let me know.
From: Richard Weinberger richard@nod.at
commit 781932375ffc6411713ee0926ccae8596ed0261c upstream.
Fastmap cannot track the LEB unmap operation, therefore it can happen that after an interrupted erasure the mapping still looks good from Fastmap's point of view, while reading from the PEB will cause an ECC error and confuses the upper layer.
Instead of teaching users of UBI how to deal with that, we read back the VID header and check for errors. If the PEB is empty or shows ECC errors we fixup the mapping and schedule the PEB for erasure.
[...]
Isn't there a risk here, that a read error leads to erasing data that might be recoverable if the read is retried?
Ben.