target: Handle 0 correctly in transport_get_sectors_6()
SBC-3 says: A TRANSFER LENGTH field set to zero specifies that 256 logical blocks shall be written. Any other value specifies the number of logical blocks that shall be written. The old code was always just returning the value in the TRANSFER LENGTH byte. Fix this to return 256 if the byte is 0. Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: stable@kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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