linux-kernel - Re: [PATCH] media: dvb: mt352, change i2c read buffer from stack, to kernel space

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Date:   Fri, 19 Nov 2021 16:16:12 +0000
From:   Mauro Carvalho Chehab <mchehab@...nel.org>
To:     rkardell <rkardell@...a.se>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: dvb: mt352, change i2c read buffer from stack,
 to kernel space

Em Thu, 7 Oct 2021 13:44:06 +0200
rkardell <rkardell@...a.se> escreveu:

> Solve problem with initialization of Mega Sky 580 USB DVB (and other 
> using mt352), error when reading i2c id.

This patch is full of 0xa0 characters instead of spaces, causing it
to be rejected. Probably either your e-mailer of your text editor is doing
something wrong. Please fix and resend.

Thanks!
Mauro

> 
> 
> Signed-off-by: rkl099 <rkardell@...a.se>
> ---
>   drivers/media/dvb-frontends/mt352.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/dvb-frontends/mt352.c 
> b/drivers/media/dvb-frontends/mt352.c
> index 399d5c519..d7f33558d 100644
> --- a/drivers/media/dvb-frontends/mt352.c
> +++ b/drivers/media/dvb-frontends/mt352.c
> @@ -69,7 +69,7 @@ static int mt352_read_register(struct mt352_state* 
> state, u8 reg)
>   {
>          int ret;
>          u8 b0 [] = { reg };
> -       u8 b1 [] = { 0 };
> +    u8 *b1=kmalloc(1,GFP_KERNEL);
>          struct i2c_msg msg [] = { { .addr = state->config.demod_address,
>                                      .flags = 0,
>                                      .buf = b0, .len = 1 },
> @@ -82,12 +82,15 @@ static int mt352_read_register(struct mt352_state* 
> state, u8 reg)
>          if (ret != 2) {
>                  printk("%s: readreg error (reg=%d, ret==%i)\n",
>                         __func__, reg, ret);
> +               kfree(b1);
>                  return ret;
>          }
> -
> -       return b1[0];
> +    ret=b1[0];
> +    kfree(b1);
> +       return ret;
>   }
> 
> +
>   static int mt352_sleep(struct dvb_frontend* fe)
>   {
>          static u8 mt352_softdown[] = { CLOCK_CTL, 0x20, 0x08 };