mtd: cfi: cmdset_0001: Do not allow read/write to suspend erase block.
Currently it is possible to read and/or write to suspend EB's. Writing /dev/mtdX or /dev/mtdblockX from several processes may break the flash state machine. Signed-off-by: NJoakim Tjernlund <joakim.tjernlund@infinera.com> Cc: <stable@vger.kernel.org> Reviewed-by: NRichard Weinberger <richard@nod.at> Signed-off-by: NBoris Brezillon <boris.brezillon@bootlin.com>
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