linux-kernel - Re: [RFC PATCH 0/4] can: bxcan: add support for ST bxCAN controller

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Message-ID: <20220817211604.o44ojny342ynk7zg@pengutronix.de>
Date:   Wed, 17 Aug 2022 23:16:04 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Dario Binacchi <dario.binacchi@...rulasolutions.com>
Cc:     linux-kernel@...r.kernel.org,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Amarula patchwork <linux-amarula@...rulasolutions.com>,
        michael@...rulasolutions.com,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-can@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [RFC PATCH 0/4] can: bxcan: add support for ST bxCAN controller

I've stripped down the Cc list a bit...

On 17.08.2022 16:35:25, Dario Binacchi wrote:
> The series adds support for the basic extended CAN controller (bxCAN)
> found in many low- to middle-end STM32 SoCs.
>
> The driver has been tested on the stm32f469i-discovery board with a
> kernel version 5.19.0-rc2 in loopback + silent mode:

I've had no time for a in depth review, but here are some warnings by
the standard checker tools:

Please fix these sparse errors:

| drivers/net/can/bxcan/bxcan-drv.c:641:39: warning: incorrect type in initializer (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:641:39:    expected struct bxcan_regs *regs
| drivers/net/can/bxcan/bxcan-drv.c:641:39:    got struct bxcan_regs [noderef] __iomem *regs
| drivers/net/can/bxcan/bxcan-drv.c:650:15: warning: incorrect type in argument 1 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:650:15:    expected void const volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:650:15:    got unsigned int *
| drivers/net/can/bxcan/bxcan-drv.c:667:20: warning: incorrect type in argument 1 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:667:20:    expected void volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:667:20:    got unsigned int *
| drivers/net/can/bxcan/bxcan-drv.c:672:17: warning: incorrect type in argument 2 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:672:17:    expected void volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:672:17:    got unsigned int *
| drivers/net/can/bxcan/bxcan-drv.c:675:9: warning: incorrect type in argument 2 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:675:9:    expected void volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:675:9:    got unsigned int *
| drivers/net/can/bxcan/bxcan-drv.c:677:15: warning: incorrect type in argument 1 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:677:15:    expected void const volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:677:15:    got unsigned int *
| drivers/net/can/bxcan/bxcan-drv.c:703:14: warning: incorrect type in argument 1 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:703:14:    expected void const volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:703:14:    got unsigned int *
| drivers/net/can/bxcan/bxcan-drv.c:709:15: warning: incorrect type in argument 1 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:709:15:    expected void const volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:709:15:    got unsigned int *
| drivers/net/can/bxcan/bxcan-drv.c:718:50: warning: incorrect type in argument 1 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:718:50:    expected void const volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:718:50:    got unsigned int *
| drivers/net/can/bxcan/bxcan-drv.c:730:39: warning: incorrect type in initializer (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:730:39:    expected struct bxcan_regs *regs
| drivers/net/can/bxcan/bxcan-drv.c:730:39:    got struct bxcan_regs [noderef] __iomem *regs
| drivers/net/can/bxcan/bxcan-drv.c:735:24: warning: incorrect type in argument 1 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:735:24:    expected void const volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:735:24:    got unsigned int *
| drivers/net/can/bxcan/bxcan-drv.c:742:17: warning: incorrect type in argument 2 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:742:17:    expected void volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:742:17:    got unsigned int *
| drivers/net/can/bxcan/bxcan-drv.c:747:28: warning: incorrect type in argument 1 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:747:28:    expected void volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:747:28:    got unsigned int *
| drivers/net/can/bxcan/bxcan-drv.c:802:39: warning: incorrect type in initializer (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:802:39:    expected struct bxcan_regs *regs
| drivers/net/can/bxcan/bxcan-drv.c:802:39:    got struct bxcan_regs [noderef] __iomem *regs
| drivers/net/can/bxcan/bxcan-drv.c:810:15: warning: incorrect type in argument 1 (different address spaces)
| drivers/net/can/bxcan/bxcan-drv.c:810:15:    expected void const volatile [noderef] __iomem *addr
| drivers/net/can/bxcan/bxcan-drv.c:810:15:    got unsigned int *

(To enable sparse checking, do a "make C=1" to compile.)

Please fix these checkpatch warnings:

| WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
| #74:
| new file mode 100644

Please create a MAINTAINERS entry.

| WARNING: Using vsprintf specifier '%px' potentially exposes the kernel memory layout, if you don't really need the address please consider using '%p'.
| #307: FILE: drivers/net/can/bxcan/bxcan-core.c:179:
| +       dev_info(&pdev->dev, "regs: %px\n", priv->base);

Please remove the print of the base address.

| WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
| #356: FILE: drivers/net/can/bxcan/bxcan-core.h:21:
| +static inline void bxcan_rmw(volatile void __iomem *addr, u32 clear, u32 set)

remove the volatile.

| WARNING: Using vsprintf specifier '%px' potentially exposes the kernel memory layout, if you don't really need the address please consider using '%p'.
| #1273: FILE: drivers/net/can/bxcan/bxcan-drv.c:899:
| +       }
| +
| +       dev_info(dev, "regs: %px, clk: %d Hz, IRQs: %d, %d, %d\n",
| +                priv->regs, priv->can.clock.freq, tx_irq, rx_irq,
| +                sce_irq);

Remote the print of the regs.

regards,
Marc

--
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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