Re: [linux-safety] [PATCH] misc: hisi_hikey_usb: use PTR_ERR_OR_ZERO

From: Lukas Bulwahn
Date: Tue Oct 27 2020 - 02:59:35 EST




On Mon, 26 Oct 2020, Sudip Mukherjee wrote:

> Coccinelle suggested using PTR_ERR_OR_ZERO() and looking at the code,
> we can use PTR_ERR_OR_ZERO() instead of checking IS_ERR() and then
> doing 'return 0'.
>
> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>

A nice small local clean up.

Here is my test report:

Build requires HISI_HIKEY_USB in config:

Symbol: HISI_HIKEY_USB [=n]
Type: tristate
Defined at drivers/misc/Kconfig:459
Prompt: USB GPIO Hub on HiSilicon Hikey 960/970 Platform
Depends on: (OF [=n] && GPIOLIB [=n] || COMPILE_TEST [=n]) &&
USB_ROLE_SWITCH [=n]

Build Preparation:

make defconfig
./scripts/config -e CONFIG_OF
./scripts/config -e CONFIG_GPIOLIB
./scripts/config -e CONFIG_USB_ROLE_SWITCH
./scripts/config -e CONFIG_HISI_HIKEY_USB
make olddefconfig

Build on next-20201027:

make
md5sum ./drivers/misc/hisi_hikey_usb.o
770db9ff0c1ca193eda2207a28deee4a ./drivers/misc/hisi_hikey_usb.o
objdump -d ./drivers/misc/hisi_hikey_usb.o > hisi_hikey_usb.next-20201027.objdump

Build with patch on next-20201027:

make clean && make
md5sum ./drivers/misc/hisi_hikey_usb.o
770db9ff0c1ca193eda2207a28deee4a ./drivers/misc/hisi_hikey_usb.o

objdump -d ./drivers/misc/hisi_hikey_usb.o > hisi_hikey_usb.cleanup-on-next-20201027.objdump

Compare objdump:

diff hisi_hikey_usb.next-20201027.objdump hisi_hikey_usb.cleanup-on-next-20201027.objdump

Summary:

'{md5sum,objdump -d} ./drivers/misc/hisi_hikey_usb.o' are identical before
and after patch.

So, no functional change and no change in object code.

Tested-by: Lukas Bulwahn <lukas.bulwahn@xxxxxxxxx>

> ---
> drivers/misc/hisi_hikey_usb.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/misc/hisi_hikey_usb.c b/drivers/misc/hisi_hikey_usb.c
> index cc93569e601c..989d7d129469 100644
> --- a/drivers/misc/hisi_hikey_usb.c
> +++ b/drivers/misc/hisi_hikey_usb.c
> @@ -168,10 +168,7 @@ static int hisi_hikey_usb_parse_kirin970(struct platform_device *pdev,
>
> hisi_hikey_usb->reset = devm_gpiod_get(&pdev->dev, "hub_reset_en_gpio",
> GPIOD_OUT_HIGH);
> - if (IS_ERR(hisi_hikey_usb->reset))
> - return PTR_ERR(hisi_hikey_usb->reset);
> -
> - return 0;
> + return PTR_ERR_OR_ZERO(hisi_hikey_usb->reset);
> }
>
> static int hisi_hikey_usb_probe(struct platform_device *pdev)
> --
> 2.11.0
>
>
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