linux-kernel - [PATCH 3.16 076/366] powerpc/powernv: Handle unknown OPAL errors in opal_nvram

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Message-ID: <lsq.1539530741.186633498@decadent.org.uk>
Date:   Sun, 14 Oct 2018 16:25:41 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Stewart Smith" <stewart@...ux.ibm.com>,
        "Michael Ellerman" <mpe@...erman.id.au>,
        "Nicholas Piggin" <npiggin@...il.com>,
        "Vasant Hegde" <hegdevasant@...ux.vnet.ibm.com>
Subject: [PATCH 3.16 076/366] powerpc/powernv: Handle unknown OPAL errors
 in opal_nvram_write()

3.16.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Nicholas Piggin <npiggin@...il.com>

commit 741de617661794246f84a21a02fc5e327bffc9ad upstream.

opal_nvram_write currently just assumes success if it encounters an
error other than OPAL_BUSY or OPAL_BUSY_EVENT. Have it return -EIO
on other errors instead.

Fixes: 628daa8d5abf ("powerpc/powernv: Add RTC and NVRAM support plus RTAS fallbacks")
Signed-off-by: Nicholas Piggin <npiggin@...il.com>
Reviewed-by: Vasant Hegde <hegdevasant@...ux.vnet.ibm.com>
Acked-by: Stewart Smith <stewart@...ux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/powerpc/platforms/powernv/opal-nvram.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/powerpc/platforms/powernv/opal-nvram.c
+++ b/arch/powerpc/platforms/powernv/opal-nvram.c
@@ -58,6 +58,10 @@ static ssize_t opal_nvram_write(char *bu
 		if (rc == OPAL_BUSY_EVENT)
 			opal_poll_events(NULL);
 	}
+
+	if (rc)
+		return -EIO;
+
 	*index += count;
 	return count;
 }