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Since hardware inflate does not support Z_PACKET_FLUSH option (used exclusively by kernel PPP driver), always switch to software like we already do for Z_BLOCK flush option. Without this patch, PPP might get Z_DATA_ERROR return code from zlib_inflate() and disable zlib compression for the packets. Link: https://lkml.kernel.org/r/20230126131428.1222214-9-zaslonko@linux.ibm.com Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Acked-by: Ilya Leoshkevich <iii@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>