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Message-ID: <d1088f1a-d9d2-68c9-ca2f-cf314f057aba@intel.com>
Date: Wed, 18 Jan 2023 07:24:30 +0200
From: "Neftin, Sasha" <sasha.neftin@...el.com>
To: Tom Rix <trix@...hat.com>, <jesse.brandeburg@...el.com>,
<anthony.l.nguyen@...el.com>, <davem@...emloft.net>,
<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
<richardcochran@...il.com>, <nathan@...nel.org>,
<ndesaulniers@...gle.com>, <vinicius.gomes@...el.com>,
<jeffrey.t.kirsher@...el.com>
CC: <netdev@...r.kernel.org>, <llvm@...ts.linux.dev>,
<intel-wired-lan@...ts.osuosl.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-wired-lan] [PATCH] igc: return an error if the mac type is
unknown in igc_ptp_systim_to_hwtstamp()
On 1/14/2023 16:04, Tom Rix wrote:
> clang static analysis reports
> drivers/net/ethernet/intel/igc/igc_ptp.c:673:3: warning: The left operand of
> '+' is a garbage value [core.UndefinedBinaryOperatorResult]
> ktime_add_ns(shhwtstamps.hwtstamp, adjust);
> ^ ~~~~~~~~~~~~~~~~~~~~
>
> igc_ptp_systim_to_hwtstamp() silently returns without setting the hwtstamp
> if the mac type is unknown. This should be treated as an error.
>
> Fixes: 81b055205e8b ("igc: Add support for RX timestamping")
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
> drivers/net/ethernet/intel/igc/igc_ptp.c | 14 +++++++++-----
> 1 file changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
> index c34734d432e0..4e10ced736db 100644
> --- a/drivers/net/ethernet/intel/igc/igc_ptp.c
> +++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
> @@ -417,10 +417,12 @@ static int igc_ptp_verify_pin(struct ptp_clock_info *ptp, unsigned int pin,
> *
> * We need to convert the system time value stored in the RX/TXSTMP registers
> * into a hwtstamp which can be used by the upper level timestamping functions.
> + *
> + * Returns 0 on success.
> **/
> -static void igc_ptp_systim_to_hwtstamp(struct igc_adapter *adapter,
> - struct skb_shared_hwtstamps *hwtstamps,
> - u64 systim)
> +static int igc_ptp_systim_to_hwtstamp(struct igc_adapter *adapter,
> + struct skb_shared_hwtstamps *hwtstamps,
> + u64 systim)
> {
> switch (adapter->hw.mac.type) {
> case igc_i225:
> @@ -430,8 +432,9 @@ static void igc_ptp_systim_to_hwtstamp(struct igc_adapter *adapter,
> systim & 0xFFFFFFFF);
> break;
> default:
> - break;
> + return -EINVAL;
> }
> + return 0;
> }
>
> /**
> @@ -652,7 +655,8 @@ static void igc_ptp_tx_hwtstamp(struct igc_adapter *adapter)
>
> regval = rd32(IGC_TXSTMPL);
> regval |= (u64)rd32(IGC_TXSTMPH) << 32;
> - igc_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval);
> + if (igc_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval))
> + return;
>
> switch (adapter->link_speed) {
> case SPEED_10:
Acked-by: Sasha Neftin <sasha.neftin@...el.com>
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