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 16:17:14 +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 Fri, 19 Nov 2021 16:16:12 +0000
Mauro Carvalho Chehab <mchehab@...nel.org> escreveu:

> 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>

Ah, the SoB and the "From:" should use your real name.

Regards,
Mauro


> > ---
> >   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 };