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Message-ID: <CAMZ6Rq+KxHxT_vm1rVW0Q6UZpfKo=63mmgn5pSwn40M-Dke9PA@mail.gmail.com>
Date: Wed, 22 Mar 2023 18:42:13 +0900
From: Vincent MAILHOL <mailhol.vincent@...adoo.fr>
To: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Wolfgang Grandegger <wg@...ndegger.com>,
Marc Kleine-Budde <mkl@...gutronix.de>,
linux-can@...r.kernel.org, netdev@...r.kernel.org,
linux-renesas-soc@...r.kernel.org,
Simon Horman <simon.horman@...igine.com>
Subject: Re: [PATCH v4 2/2] can: rcar_canfd: Improve error messages
On Wed. 22 Mar 2023 à 01:26, Geert Uytterhoeven <geert+renesas@...der.be> wrote:
> Improve printed error messages:
> - Replace numerical error codes by mnemotechnic error codes, to
> improve the user experience in case of errors,
> - Drop parentheses around printed numbers, cfr.
> Documentation/process/coding-style.rst,
> - Drop printing of an error message in case of out-of-memory, as the
> core memory allocation code already takes care of this.
>
> Suggested-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Reviewed-by: Simon Horman <simon.horman@...igine.com>
I added a nitpick. If you prefer to keep as-is, OK for me.
Reviewed-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
> ---
> v4:
> - Reviewed-by: Simon Horman <simon.horman@...igine.com>,
>
> v3:
> - Add missing SoB,
>
> v2:
> - This is v2 of "[PATCH] can: rcar_canfd: Print mnemotechnic error
> codes". I haven't added any tags given on v1, as half of the
> printed message changed.
> ---
> drivers/net/can/rcar/rcar_canfd.c | 43 +++++++++++++++----------------
> 1 file changed, 21 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
> index 6df9a259e5e4f92c..ecdb8ffe2f670c9b 100644
> --- a/drivers/net/can/rcar/rcar_canfd.c
> +++ b/drivers/net/can/rcar/rcar_canfd.c
> @@ -1417,20 +1417,20 @@ static int rcar_canfd_open(struct net_device *ndev)
>
> err = phy_power_on(priv->transceiver);
> if (err) {
> - netdev_err(ndev, "failed to power on PHY, error %d\n", err);
> + netdev_err(ndev, "failed to power on PHY, %pe\n", ERR_PTR(err));
^
Nitpick, consider a colon instead of the coma:
netdev_err(ndev, "failed to power on PHY: %pe\n",
ERR_PTR(err));
N.B. This is more a personal preference than an official Linux style.
If you prefer the coma, you can ignore my nitpick and keep it as it is
:)
> return err;
> }
>
> /* Peripheral clock is already enabled in probe */
> err = clk_prepare_enable(gpriv->can_clk);
> if (err) {
> - netdev_err(ndev, "failed to enable CAN clock, error %d\n", err);
> + netdev_err(ndev, "failed to enable CAN clock, %pe\n", ERR_PTR(err));
> goto out_phy;
> }
>
> err = open_candev(ndev);
> if (err) {
> - netdev_err(ndev, "open_candev() failed, error %d\n", err);
> + netdev_err(ndev, "open_candev() failed, %pe\n", ERR_PTR(err));
> goto out_can_clock;
> }
>
> @@ -1731,10 +1731,9 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
> int err = -ENODEV;
>
> ndev = alloc_candev(sizeof(*priv), RCANFD_FIFO_DEPTH);
> - if (!ndev) {
> - dev_err(dev, "alloc_candev() failed\n");
> + if (!ndev)
> return -ENOMEM;
> - }
> +
> priv = netdev_priv(ndev);
>
> ndev->netdev_ops = &rcar_canfd_netdev_ops;
> @@ -1777,8 +1776,8 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
> rcar_canfd_channel_err_interrupt, 0,
> irq_name, priv);
> if (err) {
> - dev_err(dev, "devm_request_irq CH Err(%d) failed, error %d\n",
> - err_irq, err);
> + dev_err(dev, "devm_request_irq CH Err %d failed, %pe\n",
> + err_irq, ERR_PTR(err));
> goto fail;
> }
> irq_name = devm_kasprintf(dev, GFP_KERNEL, "canfd.ch%d_trx",
> @@ -1791,8 +1790,8 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
> rcar_canfd_channel_tx_interrupt, 0,
> irq_name, priv);
> if (err) {
> - dev_err(dev, "devm_request_irq Tx (%d) failed, error %d\n",
> - tx_irq, err);
> + dev_err(dev, "devm_request_irq Tx %d failed, %pe\n",
> + tx_irq, ERR_PTR(err));
> goto fail;
> }
> }
> @@ -1823,7 +1822,7 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
> gpriv->ch[priv->channel] = priv;
> err = register_candev(ndev);
> if (err) {
> - dev_err(dev, "register_candev() failed, error %d\n", err);
> + dev_err(dev, "register_candev() failed, %pe\n", ERR_PTR(err));
> goto fail_candev;
> }
> dev_info(dev, "device registered (channel %u)\n", priv->channel);
> @@ -1967,16 +1966,16 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> rcar_canfd_channel_interrupt, 0,
> "canfd.ch_int", gpriv);
> if (err) {
> - dev_err(dev, "devm_request_irq(%d) failed, error %d\n",
> - ch_irq, err);
> + dev_err(dev, "devm_request_irq %d failed, %pe\n",
> + ch_irq, ERR_PTR(err));
> goto fail_dev;
> }
>
> err = devm_request_irq(dev, g_irq, rcar_canfd_global_interrupt,
> 0, "canfd.g_int", gpriv);
> if (err) {
> - dev_err(dev, "devm_request_irq(%d) failed, error %d\n",
> - g_irq, err);
> + dev_err(dev, "devm_request_irq %d failed, %pe\n",
> + g_irq, ERR_PTR(err));
> goto fail_dev;
> }
> } else {
> @@ -1985,8 +1984,8 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> "canfd.g_recc", gpriv);
>
> if (err) {
> - dev_err(dev, "devm_request_irq(%d) failed, error %d\n",
> - g_recc_irq, err);
> + dev_err(dev, "devm_request_irq %d failed, %pe\n",
> + g_recc_irq, ERR_PTR(err));
> goto fail_dev;
> }
>
> @@ -1994,8 +1993,8 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> rcar_canfd_global_err_interrupt, 0,
> "canfd.g_err", gpriv);
> if (err) {
> - dev_err(dev, "devm_request_irq(%d) failed, error %d\n",
> - g_err_irq, err);
> + dev_err(dev, "devm_request_irq %d failed, %pe\n",
> + g_err_irq, ERR_PTR(err));
> goto fail_dev;
> }
> }
> @@ -2012,14 +2011,14 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> /* Enable peripheral clock for register access */
> err = clk_prepare_enable(gpriv->clkp);
> if (err) {
> - dev_err(dev, "failed to enable peripheral clock, error %d\n",
> - err);
> + dev_err(dev, "failed to enable peripheral clock, %pe\n",
> + ERR_PTR(err));
> goto fail_reset;
> }
>
> err = rcar_canfd_reset_controller(gpriv);
> if (err) {
> - dev_err(dev, "reset controller failed\n");
> + dev_err(dev, "reset controller failed, %pe\n", ERR_PTR(err));
> goto fail_clk;
> }
>
> --
> 2.34.1
>
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