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From:   Mario Limonciello <mario.limonciello@amd.com>
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        Alessandro Zummo <a.zummo@towertech.it>,
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CC:     "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
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        <x86@kernel.org>, <dhaval.giani@gmail.com>,
        "Mario Limonciello" <mario.limonciello@amd.com>
Subject: [PATCH v2 1/4] rtc: mc146818-lib: Adjust failure return code for mc146818_get_time()
Date:   Mon, 20 Nov 2023 08:15:52 -0600
Message-ID: <20231120141555.458-2-mario.limonciello@amd.com>
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mc146818_get_time() calls mc146818_avoid_UIP() to avoid fetching the
time while RTC update is in progress (UIP). When this fails, the return
code is -EIO, but actually there was no IO failure.

The reason for the return from mc146818_avoid_UIP() is that the UIP
wasn't cleared in the time period. Adjust the return code to -ETIMEDOUT
to match the behavior.

Cc: stable@vger.kernel.org
Fixes: 2a61b0ac5493 ("rtc: mc146818-lib: refactor mc146818_get_time")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
v1->v2:
 * Add stable and fixes tag
---
 drivers/rtc/rtc-mc146818-lib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-mc146818-lib.c b/drivers/rtc/rtc-mc146818-lib.c
index f1c09f1db044..43a28e82674e 100644
--- a/drivers/rtc/rtc-mc146818-lib.c
+++ b/drivers/rtc/rtc-mc146818-lib.c
@@ -138,7 +138,7 @@ int mc146818_get_time(struct rtc_time *time)
 
 	if (!mc146818_avoid_UIP(mc146818_get_time_callback, &p)) {
 		memset(time, 0, sizeof(*time));
-		return -EIO;
+		return -ETIMEDOUT;
 	}
 
 	if (!(p.ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
-- 
2.34.1