linux-kernel - [PATCH 3.16 067/410] EDAC, octeon: Fix an uninitialized variable warning

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Date:   Thu, 07 Jun 2018 15:05:21 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "linux-edac" <linux-edac@...r.kernel.org>,
        "David Daney" <david.daney@...ium.com>, linux-mips@...ux-mips.org,
        "James Hogan" <jhogan@...nel.org>, "Borislav Petkov" <bp@...e.de>
Subject: [PATCH 3.16 067/410] EDAC, octeon: Fix an uninitialized variable
 warning

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

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

From: James Hogan <jhogan@...nel.org>

commit 544e92581a2ac44607d7cc602c6b54d18656f56d upstream.

Fix an uninitialized variable warning in the Octeon EDAC driver, as seen
in MIPS cavium_octeon_defconfig builds since v4.14 with Codescape GNU
Tools 2016.05-03:

  drivers/edac/octeon_edac-lmc.c In function ‘octeon_lmc_edac_poll_o2’:
  drivers/edac/octeon_edac-lmc.c:87:24: warning: ‘((long unsigned int*)&int_reg)[1]’ may \
    be used uninitialized in this function [-Wmaybe-uninitialized]
    if (int_reg.s.sec_err || int_reg.s.ded_err) {
                        ^
Iinitialise the whole int_reg variable to zero before the conditional
assignments in the error injection case.

Signed-off-by: James Hogan <jhogan@...nel.org>
Acked-by: David Daney <david.daney@...ium.com>
Cc: linux-edac <linux-edac@...r.kernel.org>
Cc: linux-mips@...ux-mips.org
Fixes: 1bc021e81565 ("EDAC: Octeon: Add error injection support")
Link: http://lkml.kernel.org/r/20171113161206.20990-1-james.hogan@mips.com
Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/edac/octeon_edac-lmc.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/edac/octeon_edac-lmc.c
+++ b/drivers/edac/octeon_edac-lmc.c
@@ -79,6 +79,7 @@ static void octeon_lmc_edac_poll_o2(stru
 	if (!pvt->inject)
 		int_reg.u64 = cvmx_read_csr(CVMX_LMCX_INT(mci->mc_idx));
 	else {
+		int_reg.u64 = 0;
 		if (pvt->error_type == 1)
 			int_reg.s.sec_err = 1;
 		if (pvt->error_type == 2)