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[24.205.208.113]) by smtp.gmail.com with ESMTPSA id o17-20020a9d5c11000000b005b2611a13edsm6324116otk.61.2022.03.13.08.02.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Mar 2022 08:02:19 -0700 (PDT) From: trix@redhat.com To: jesse.brandeburg@intel.com, anthony.l.nguyen@intel.com, davem@davemloft.net, kuba@kernel.org, nathan@kernel.org, ndesaulniers@google.com Cc: intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Tom Rix Subject: [PATCH] igb: zero hwtstamp by default Date: Sun, 13 Mar 2022 08:02:10 -0700 Message-Id: <20220313150210.1508203-1-trix@redhat.com> X-Mailer: git-send-email 2.26.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tom Rix Clang static analysis reports this representative issue igb_ptp.c:997:3: warning: The left operand of '+' is a garbage value ktime_add_ns(shhwtstamps.hwtstamp, adjust); ^ ~~~~~~~~~~~~~~~~~~~~ shhwtstamps.hwtstamp is set by a call to igb_ptp_systim_to_hwtstamp(). In the switch-statement for the hw type, the hwtstamp is zeroed for matches but not the default case. Move the memset out of switch-statement. This degarbages the default case and reduces the size. Some whitespace cleanup of empty lines Signed-off-by: Tom Rix --- drivers/net/ethernet/intel/igb/igb_ptp.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c index 6580fcddb4be5..02fec948ce642 100644 --- a/drivers/net/ethernet/intel/igb/igb_ptp.c +++ b/drivers/net/ethernet/intel/igb/igb_ptp.c @@ -165,23 +165,21 @@ static void igb_ptp_systim_to_hwtstamp(struct igb_adapter *adapter, unsigned long flags; u64 ns; + memset(hwtstamps, 0, sizeof(*hwtstamps)); + switch (adapter->hw.mac.type) { case e1000_82576: case e1000_82580: case e1000_i354: case e1000_i350: spin_lock_irqsave(&adapter->tmreg_lock, flags); - ns = timecounter_cyc2time(&adapter->tc, systim); - spin_unlock_irqrestore(&adapter->tmreg_lock, flags); - memset(hwtstamps, 0, sizeof(*hwtstamps)); hwtstamps->hwtstamp = ns_to_ktime(ns); break; case e1000_i210: case e1000_i211: - memset(hwtstamps, 0, sizeof(*hwtstamps)); /* Upper 32 bits contain s, lower 32 bits contain ns. */ hwtstamps->hwtstamp = ktime_set(systim >> 32, systim & 0xFFFFFFFF); -- 2.26.3