From 999680c4ed80e21e014e94c9bdb79c45a5a5a853 Mon Sep 17 00:00:00 2001
From: John Keeping <john@metanate.com>
Date: Mon, 27 Mar 2023 12:01:08 +0100
Subject: [PATCH] rockchip: misc: fix misc_read() return check
misc_read() is documented to return the number of bytes read or a
negative error value. The Rockchip drivers currently do not implement
this correctly and instead return zero on success or a negative error
value.
In preparation for fixing the drivers, fix the condition here to only
error on negative values.
Suggested-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: John Keeping <john@metanate.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
---
arch/arm/mach-rockchip/misc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/mach-rockchip/misc.c b/arch/arm/mach-rockchip/misc.c
index 849014d2fb..7d03f0c2b6 100644
--- a/arch/arm/mach-rockchip/misc.c
+++ b/arch/arm/mach-rockchip/misc.c
@@ -83,7 +83,7 @@ int rockchip_cpuid_from_efuse(const u32 cpuid_offset,
/* read the cpu_id range from the efuses */
ret = misc_read(dev, cpuid_offset, cpuid, cpuid_length);
- if (ret) {
+ if (ret < 0) {
debug("%s: reading cpuid from the efuses failed\n",
__func__);
return -1;
--
2.39.5