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lib/zlib: DFLTCC always switch to software inflate for Z_PACKET_FLUSH option

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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>
This commit is contained in:
Mikhail Zaslonko 2023-01-26 14:14:28 +01:00 committed by Andrew Morton
parent 9010dbc007
commit f65c35d333
1 changed files with 4 additions and 2 deletions
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6
lib/zlib_dfltcc/dfltcc_inflate.c
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@ -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;