spi/mpc8xxx: fix buffer overrun on large transfers
It fixes an issue when sending-only or receiving-only more than PAGE_SIZE bytes. Signed-off-by: Nchristophe leroy <christophe.leroy@c-s.fr> Acked-by: NJoakim Tjernlund <Joakim.Tjernlund@transmode.se> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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