linux-kernel - Re: [PATCH] drivers/usb/typec/tps6598x.c: fix two bugs

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Date:   Fri, 28 Jun 2019 11:34:17 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, nv@...n.de
Subject: Re: [PATCH] drivers/usb/typec/tps6598x.c: fix two bugs

On Fri, Jun 28, 2019 at 10:12:35AM +0200, Nikolaus Voss wrote:
> 1. Portinfo bit field is 3 bits wide, not 2 bits. This led to
>    a wrong driver configuration for some tps6598x configurations.
> 
> 2. Writing 4CC commands with tps6598x_write_4cc() already has
>    a pointer arg, don't reference it when using as arg to
>    tps6598x_block_write(). Correcting this enforces the constness
>    of the pointer to propagate to tps6598x_block_write(), so add
>    the const qualifier there to avoid the warning.

Like Greg said, if please supply separate patches. Also, if these are
fixes, then please mark them as such with appropriate tags:

        Fixes: ....
        Cc: stable@...


> Signed-off-by: Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
> ---
>  drivers/usb/typec/tps6598x.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/typec/tps6598x.c b/drivers/usb/typec/tps6598x.c
> index c674abe3cf99..a38d1409f15b 100644
> --- a/drivers/usb/typec/tps6598x.c
> +++ b/drivers/usb/typec/tps6598x.c
> @@ -41,7 +41,7 @@
>  #define TPS_STATUS_VCONN(s)		(!!((s) & BIT(7)))
>  
>  /* TPS_REG_SYSTEM_CONF bits */
> -#define TPS_SYSCONF_PORTINFO(c)		((c) & 3)
> +#define TPS_SYSCONF_PORTINFO(c)		((c) & 7)
>  
>  enum {
>  	TPS_PORTINFO_SINK,
> @@ -127,7 +127,7 @@ tps6598x_block_read(struct tps6598x *tps, u8 reg, void *val, size_t len)
>  }
>  
>  static int tps6598x_block_write(struct tps6598x *tps, u8 reg,
> -				void *val, size_t len)
> +				const void *val, size_t len)
>  {
>  	u8 data[TPS_MAX_LEN + 1];
>  
> @@ -173,7 +173,7 @@ static inline int tps6598x_write64(struct tps6598x *tps, u8 reg, u64 val)
>  static inline int
>  tps6598x_write_4cc(struct tps6598x *tps, u8 reg, const char *val)
>  {
> -	return tps6598x_block_write(tps, reg, &val, sizeof(u32));
> +	return tps6598x_block_write(tps, reg, val, 4);
>  }
>  
>  static int tps6598x_read_partner_identity(struct tps6598x *tps)
> -- 
> 2.17.1

thanks,

-- 
heikki