From: Arnd Bergmann <arnd@arndb.de>
Date: Mon, 17 Jun 2019 15:04:49 +0200
Subject: qed: Fix -Wmaybe-uninitialized false positive
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Patch-mainline: v5.3-rc1
Git-commit: 815deee0e34503dee7e74fb5ba4ea4a9b3a56750
References: bsc#1136460 jsc#SLE-4691 bsc#1136461 jsc#SLE-4692

A previous attempt to shut up the uninitialized variable use
warning was apparently insufficient. When CONFIG_PROFILE_ANNOTATED_BRANCHES
is set, gcc-8 still warns, because the unlikely() check in DP_NOTICE()
causes it to no longer track the state of all variables correctly:

drivers/net/ethernet/qlogic/qed/qed_dev.c: In function 'qed_llh_set_ppfid_affinity':
drivers/net/ethernet/qlogic/qed/qed_dev.c:798:47: error: 'abs_ppfid' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  addr = NIG_REG_PPF_TO_ENGINE_SEL + abs_ppfid * 0x4;
                                     ~~~~~~~~~~^~~~~

This is not a nice workaround, but always initializing the output from
qed_llh_abs_ppfid() at least shuts up the false positive reliably.

Fixes: 79284adeb99e ("qed: Add llh ppfid interface and 100g support for offload protocols")
Fixes: 8e2ea3ea9625 ("qed: Fix static checker warning")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/qlogic/qed/qed_dev.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/ethernet/qlogic/qed/qed_dev.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_dev.c
@@ -652,6 +652,7 @@ static int qed_llh_abs_ppfid(struct qed_
 		DP_NOTICE(cdev,
 			  "ppfid %d is not valid, available indices are 0..%hhd\n",
 			  ppfid, p_llh_info->num_ppfid - 1);
+		*p_abs_ppfid = 0;
 		return -EINVAL;
 	}