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From a2892bf5db7520689fa9cb1d1589fa804bd9dc1a Mon Sep 17 00:00:00 2001
From: Bing Song <bing.song@nxp.com>
Date: Tue, 18 Aug 2020 15:26:51 +0800
Subject: [PATCH] tinycompress: pass NULL buffer with 0 size to driver.
The NULL buffer with 0 size to indecate driver drain input data with
non-block mode. The defaul drain is block mode.
Upstream-Status: Inappropriate [i.MX specific]
Signed-off-by: Bing Song <bing.song@nxp.com>
---
src/lib/compress.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/lib/compress.c b/src/lib/compress.c
index bba4fcf..d66df0b 100644
--- a/src/lib/compress.c
+++ b/src/lib/compress.c
@@ -315,7 +315,8 @@ int compress_write(struct compress *compress, const void *buf, unsigned int size
fds.events = POLLOUT;
/*TODO: treat auto start here first */
- while (size) {
+ /* NULL buffer with 0 size for non-block drain */
+ do {
if (ioctl(compress->fd, SNDRV_COMPRESS_AVAIL, &avail))
return oops(compress, errno, "cannot get avail");
@@ -357,7 +358,7 @@ int compress_write(struct compress *compress, const void *buf, unsigned int size
size -= written;
cbuf += written;
total += written;
- }
+ } while (size);
return total;
}
--
2.17.1
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