[PATCH net] mcs7780: Silence uninitialized variable warning

[PATCH net] mcs7780: Silence uninitialized variable warning

[Dan Carpenter]

My static checker complains that, if the allocation in mcs_get_reg()
fails, it means we use "rval" without initializing it.  Small
allocations never fail in current kernels so it's not a major concern
but it's simple enough to silence the warning.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/net/irda/mcs7780.c b/drivers/net/irda/mcs7780.c
index 765de3bedb88..64b29880e534 100644
--- a/drivers/net/irda/mcs7780.c
+++ b/drivers/net/irda/mcs7780.c
@@ -585,7 +585,7 @@ static int mcs_speed_change(struct mcs_cb *mcs)
 	int rst = 0;
 	int cnt = 0;
 	__u16 nspeed;
-	__u16 rval;
+	__u16 rval = -1;
 
 	nspeed = mcs_speed_set[(mcs->new_speed >> 8) & 0x0f];
 

Re: [PATCH net] mcs7780: Silence uninitialized variable warning

[David Miller]

From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Fri, 28 Jul 2017 17:45:11 +0300

> -	__u16 rval;
> +	__u16 rval = -1;

Fixing a bogus warning by assigning a signed constant to an
unsigned variable doesn't really make me all that happy.

I don't think I'll apply this, sorry.

Re: [PATCH net] mcs7780: Silence uninitialized variable warning

[Dan Carpenter]

On Sat, Jul 29, 2017 at 11:28:55PM -0700, David Miller wrote:
> From: Dan Carpenter <dan.carpenter@oracle.com>
> Date: Fri, 28 Jul 2017 17:45:11 +0300
> 
> > -	__u16 rval;
> > +	__u16 rval = -1;
> 
> Fixing a bogus warning by assigning a signed constant to an
> unsigned variable doesn't really make me all that happy.
> 
> I don't think I'll apply this, sorry.

There's no guarantee that small kmallocs will always succeed in future
kernels so it's not *totally* bogus.

regards,
dan carpenter

Re: [PATCH net] mcs7780: Silence uninitialized variable warning

[David Miller]

From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon, 31 Jul 2017 10:41:40 +0300

> On Sat, Jul 29, 2017 at 11:28:55PM -0700, David Miller wrote:
>> From: Dan Carpenter <dan.carpenter@oracle.com>
>> Date: Fri, 28 Jul 2017 17:45:11 +0300
>> 
>> > -	__u16 rval;
>> > +	__u16 rval = -1;
>> 
>> Fixing a bogus warning by assigning a signed constant to an
>> unsigned variable doesn't really make me all that happy.
>> 
>> I don't think I'll apply this, sorry.
> 
> There's no guarantee that small kmallocs will always succeed in future
> kernels so it's not *totally* bogus.

Perhaps the burdon of initializing the value belongs in
mcs_get_reg(), and you can set it properly to 0xffff
instead of -1.

Ok?

Re: [PATCH net] mcs7780: Silence uninitialized variable warning

[Dan Carpenter]

On Mon, Jul 31, 2017 at 10:37:16AM -0700, David Miller wrote:
> From: Dan Carpenter <dan.carpenter@oracle.com>
> Date: Mon, 31 Jul 2017 10:41:40 +0300
> 
> > On Sat, Jul 29, 2017 at 11:28:55PM -0700, David Miller wrote:
> >> From: Dan Carpenter <dan.carpenter@oracle.com>
> >> Date: Fri, 28 Jul 2017 17:45:11 +0300
> >> 
> >> > -	__u16 rval;
> >> > +	__u16 rval = -1;
> >> 
> >> Fixing a bogus warning by assigning a signed constant to an
> >> unsigned variable doesn't really make me all that happy.
> >> 
> >> I don't think I'll apply this, sorry.
> > 
> > There's no guarantee that small kmallocs will always succeed in future
> > kernels so it's not *totally* bogus.
> 
> Perhaps the burdon of initializing the value belongs in
> mcs_get_reg(), and you can set it properly to 0xffff
> instead of -1.
> 
> Ok?

Sure.  I will resend.

thanks,
dan carpenter