linux-kernel - Re: [PATCH] phy: usb: free the buffer after reading a given nvmem cell

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Date:   Tue, 6 Sep 2022 08:38:11 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Vincent Shih <vincent.sunplus@...il.com>
Cc:     kishon@...com, vkoul@...nel.org, linux-usb@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
        wells.lu@...plus.com
Subject: Re: [PATCH] phy: usb: free the buffer after reading a given nvmem
 cell

On Tue, Sep 06, 2022 at 02:23:02PM +0800, Vincent Shih wrote:
> Use kfree() to free the buffer after calling nvmem_cell_read() to
> read a given nvmem cell.
> 
> Fixes:99d9ccd97385("phy: usb: Add USB2.0 phy driver for Sunplus SP7021")

This is not a commit in Linus's tree, are you sure it is right?

And the format is not quite correct, you need some spaces in the line.

> Signed-off-by: Vincent Shih <vincent.sunplus@...il.com>
> ---
>  drivers/phy/sunplus/phy-sunplus-usb2.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/phy/sunplus/phy-sunplus-usb2.c b/drivers/phy/sunplus/phy-sunplus-usb2.c
> index 5269968..c8540e1 100644
> --- a/drivers/phy/sunplus/phy-sunplus-usb2.c
> +++ b/drivers/phy/sunplus/phy-sunplus-usb2.c
> @@ -13,6 +13,7 @@
>  #include <linux/bitfield.h>
>  #include <linux/clk.h>
>  #include <linux/delay.h>
> +#include <linux/err.h>
>  #include <linux/io.h>
>  #include <linux/module.h>
>  #include <linux/nvmem-consumer.h>
> @@ -92,13 +93,15 @@ static int update_disc_vol(struct sp_usbphy *usbphy)
>  	otp_v = nvmem_cell_read(cell, &otp_l);
>  	nvmem_cell_put(cell);
>  
> -	if (otp_v) {
> +	if (!IS_ERR(otp_v)) {
>  		set = *(otp_v + 1);
>  		set = (set << (sizeof(char) * 8)) | *otp_v;
>  		set = (set >> usbphy->disc_vol_addr_off) & J_DISC;
> +		
> +		kfree(otp_v);
>  	}
> -
> -	if (!otp_v || set == 0)
> +	
> +	if (IS_ERR(otp_v) || (set == 0))
>  		set = OTP_DISC_LEVEL_DEFAULT;
>  
>  	val = readl(usbphy->phy_regs + CONFIG7);
> @@ -294,3 +297,4 @@ module_platform_driver(sunplus_usb_phy_driver);
>  MODULE_AUTHOR("Vincent Shih <vincent.shih@...plus.com>");
>  MODULE_DESCRIPTION("Sunplus USB 2.0 phy driver");
>  MODULE_LICENSE("GPL");
> +

Why the extra blank line?

thanks,

greg k-h