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Subject[PATCH 8/8] lib/zlib: DFLTCC always switch to software inflate for Z_PACKET_FLUSH option
Date
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.

Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
lib/zlib_dfltcc/dfltcc_inflate.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/zlib_dfltcc/dfltcc_inflate.c b/lib/zlib_dfltcc/dfltcc_inflate.c
index 5786030c6dc2..437cd34c8490 100644
--- a/lib/zlib_dfltcc/dfltcc_inflate.c
+++ b/lib/zlib_dfltcc/dfltcc_inflate.c
@@ -95,8 +95,10 @@ dfltcc_inflate_action dfltcc_inflate(
struct dfltcc_param_v0 *param = &dfltcc_state->param;
dfltcc_cc cc;

- if (flush == Z_BLOCK) {
- /* DFLTCC does not support stopping on block boundaries */
+ if (flush == Z_BLOCK || flush == Z_PACKET_FLUSH) {
+ /* DFLTCC does not support stopping on block boundaries (Z_BLOCK flush option)
+ * as well as the use of Z_PACKET_FLUSH option (used exclusively by PPP driver)
+ */
if (dfltcc_inflate_disable(strm)) {
*ret = Z_STREAM_ERROR;
return DFLTCC_INFLATE_BREAK;
--
2.34.1
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