From 0dbae46550363c88cf073aafc0e0b244b9f43555 Mon Sep 17 00:00:00 2001
From: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Date: Thu, 26 Jan 2023 14:14:24 +0100
Subject: lib/zlib: fix DFLTCC ignoring flush modes when avail_in == 0

This commit is based on:
  https://github.com/zlib-ng/zlib-ng/commit/40acb3f

Link: https://lkml.kernel.org/r/20230126131428.1222214-5-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>
---
 lib/zlib_dfltcc/dfltcc_deflate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'lib/zlib_dfltcc')

diff --git a/lib/zlib_dfltcc/dfltcc_deflate.c b/lib/zlib_dfltcc/dfltcc_deflate.c
index dc85ec890163..211d344710d5 100644
--- a/lib/zlib_dfltcc/dfltcc_deflate.c
+++ b/lib/zlib_dfltcc/dfltcc_deflate.c
@@ -142,7 +142,8 @@ again:
         /* Clear history. */
         if (flush == Z_FULL_FLUSH)
             param->hl = 0;
-        *result = need_more;
+        /* Trigger block post-processing if necessary. */
+        *result = no_flush ? need_more : block_done;
         return 1;
     }
 
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