* [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()
@ 2012-11-13 7:44 ` Dan Carpenter
0 siblings, 0 replies; 12+ messages in thread
From: Dan Carpenter @ 2012-11-13 7:44 UTC (permalink / raw)
To: Jaroslav Kysela
Cc: Takashi Iwai, Mauro Carvalho Chehab, Ondrej Zary, Hans de Goede,
Rusty Russell, alsa-devel, linux-kernel, kernel-janitors
I don't think this works as intended. '|' higher precedence than ?: so
the bitwize OR "0 | (val & STR_MOST)" is a no-op.
I have re-written it to be more clear.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
I don't have a way to test this.
diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
index 50169bc..7266020 100644
--- a/sound/pci/es1968.c
+++ b/sound/pci/es1968.c
@@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct snd_tea575x *tea)
struct es1968 *chip = tea->private_data;
unsigned long io = chip->io_port + GPIO_DATA;
u16 val = inw(io);
-
- return (val & STR_DATA) ? TEA575X_DATA : 0 |
- (val & STR_MOST) ? TEA575X_MOST : 0;
+ u8 ret;
+
+ ret = 0;
+ if (val & STR_DATA)
+ ret |= TEA575X_DATA;
+ if (val & STR_MOST)
+ ret |= TEA575X_MOST;
+ return ret;
}
static void snd_es1968_tea575x_set_direction(struct snd_tea575x *tea, bool output)
^ permalink raw reply related [flat|nested] 12+ messages in thread
* [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()
@ 2012-11-13 7:44 ` Dan Carpenter
0 siblings, 0 replies; 12+ messages in thread
From: Dan Carpenter @ 2012-11-13 7:44 UTC (permalink / raw)
To: Jaroslav Kysela
Cc: alsa-devel, Ondrej Zary, Mauro Carvalho Chehab, Takashi Iwai,
Rusty Russell, kernel-janitors, linux-kernel, Hans de Goede
I don't think this works as intended. '|' higher precedence than ?: so
the bitwize OR "0 | (val & STR_MOST)" is a no-op.
I have re-written it to be more clear.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
I don't have a way to test this.
diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
index 50169bc..7266020 100644
--- a/sound/pci/es1968.c
+++ b/sound/pci/es1968.c
@@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct snd_tea575x *tea)
struct es1968 *chip = tea->private_data;
unsigned long io = chip->io_port + GPIO_DATA;
u16 val = inw(io);
-
- return (val & STR_DATA) ? TEA575X_DATA : 0 |
- (val & STR_MOST) ? TEA575X_MOST : 0;
+ u8 ret;
+
+ ret = 0;
+ if (val & STR_DATA)
+ ret |= TEA575X_DATA;
+ if (val & STR_MOST)
+ ret |= TEA575X_MOST;
+ return ret;
}
static void snd_es1968_tea575x_set_direction(struct snd_tea575x *tea, bool output)
^ permalink raw reply related [flat|nested] 12+ messages in thread
* Re: [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()
2012-11-13 7:44 ` Dan Carpenter
@ 2012-11-13 7:53 ` Takashi Iwai
-1 siblings, 0 replies; 12+ messages in thread
From: Takashi Iwai @ 2012-11-13 7:53 UTC (permalink / raw)
To: Dan Carpenter
Cc: Jaroslav Kysela, Mauro Carvalho Chehab, Ondrej Zary,
Hans de Goede, Rusty Russell, alsa-devel, linux-kernel,
kernel-janitors
At Tue, 13 Nov 2012 10:44:54 +0300,
Dan Carpenter wrote:
>
> I don't think this works as intended. '|' higher precedence than ?: so
> the bitwize OR "0 | (val & STR_MOST)" is a no-op.
>
> I have re-written it to be more clear.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Thanks, applied now.
Takashi
> ---
> I don't have a way to test this.
>
> diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
> index 50169bc..7266020 100644
> --- a/sound/pci/es1968.c
> +++ b/sound/pci/es1968.c
> @@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct snd_tea575x *tea)
> struct es1968 *chip = tea->private_data;
> unsigned long io = chip->io_port + GPIO_DATA;
> u16 val = inw(io);
> -
> - return (val & STR_DATA) ? TEA575X_DATA : 0 |
> - (val & STR_MOST) ? TEA575X_MOST : 0;
> + u8 ret;
> +
> + ret = 0;
> + if (val & STR_DATA)
> + ret |= TEA575X_DATA;
> + if (val & STR_MOST)
> + ret |= TEA575X_MOST;
> + return ret;
> }
>
> static void snd_es1968_tea575x_set_direction(struct snd_tea575x *tea, bool output)
>
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()
@ 2012-11-13 7:53 ` Takashi Iwai
0 siblings, 0 replies; 12+ messages in thread
From: Takashi Iwai @ 2012-11-13 7:53 UTC (permalink / raw)
To: Dan Carpenter
Cc: Jaroslav Kysela, Mauro Carvalho Chehab, Ondrej Zary,
Hans de Goede, Rusty Russell, alsa-devel, linux-kernel,
kernel-janitors
At Tue, 13 Nov 2012 10:44:54 +0300,
Dan Carpenter wrote:
>
> I don't think this works as intended. '|' higher precedence than ?: so
> the bitwize OR "0 | (val & STR_MOST)" is a no-op.
>
> I have re-written it to be more clear.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Thanks, applied now.
Takashi
> ---
> I don't have a way to test this.
>
> diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
> index 50169bc..7266020 100644
> --- a/sound/pci/es1968.c
> +++ b/sound/pci/es1968.c
> @@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct snd_tea575x *tea)
> struct es1968 *chip = tea->private_data;
> unsigned long io = chip->io_port + GPIO_DATA;
> u16 val = inw(io);
> -
> - return (val & STR_DATA) ? TEA575X_DATA : 0 |
> - (val & STR_MOST) ? TEA575X_MOST : 0;
> + u8 ret;
> +
> + ret = 0;
> + if (val & STR_DATA)
> + ret |= TEA575X_DATA;
> + if (val & STR_MOST)
> + ret |= TEA575X_MOST;
> + return ret;
> }
>
> static void snd_es1968_tea575x_set_direction(struct snd_tea575x *tea, bool output)
>
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()
2012-11-13 7:44 ` Dan Carpenter
@ 2012-11-13 8:03 ` Joe Perches
-1 siblings, 0 replies; 12+ messages in thread
From: Joe Perches @ 2012-11-13 8:03 UTC (permalink / raw)
To: Dan Carpenter
Cc: Jaroslav Kysela, Takashi Iwai, Mauro Carvalho Chehab, Ondrej Zary,
Hans de Goede, Rusty Russell, alsa-devel, linux-kernel,
kernel-janitors
On Tue, 2012-11-13 at 10:44 +0300, Dan Carpenter wrote:
> I don't think this works as intended. '|' higher precedence than ?: so
> the bitwize OR "0 | (val & STR_MOST)" is a no-op.
>
> I have re-written it to be more clear.
[]
> diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
[]
> @@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct snd_tea575x *tea)
> struct es1968 *chip = tea->private_data;
> unsigned long io = chip->io_port + GPIO_DATA;
> u16 val = inw(io);
> -
> - return (val & STR_DATA) ? TEA575X_DATA : 0 |
> - (val & STR_MOST) ? TEA575X_MOST : 0;
> + u8 ret;
> +
> + ret = 0;
> + if (val & STR_DATA)
> + ret |= TEA575X_DATA;
> + if (val & STR_MOST)
> + ret |= TEA575X_MOST;
> + return ret;
Cute. smatch I presume? Tools are useful.
Moving the close parentheses is a pretty common style too
return (val & STR_DATA ? TEA575X_DATA : 0) |
(val & STR_MOST ? TEA575X_MOST : 0);
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()
@ 2012-11-13 8:03 ` Joe Perches
0 siblings, 0 replies; 12+ messages in thread
From: Joe Perches @ 2012-11-13 8:03 UTC (permalink / raw)
To: Dan Carpenter
Cc: Jaroslav Kysela, Takashi Iwai, Mauro Carvalho Chehab, Ondrej Zary,
Hans de Goede, Rusty Russell, alsa-devel, linux-kernel,
kernel-janitors
On Tue, 2012-11-13 at 10:44 +0300, Dan Carpenter wrote:
> I don't think this works as intended. '|' higher precedence than ?: so
> the bitwize OR "0 | (val & STR_MOST)" is a no-op.
>
> I have re-written it to be more clear.
[]
> diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
[]
> @@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct snd_tea575x *tea)
> struct es1968 *chip = tea->private_data;
> unsigned long io = chip->io_port + GPIO_DATA;
> u16 val = inw(io);
> -
> - return (val & STR_DATA) ? TEA575X_DATA : 0 |
> - (val & STR_MOST) ? TEA575X_MOST : 0;
> + u8 ret;
> +
> + ret = 0;
> + if (val & STR_DATA)
> + ret |= TEA575X_DATA;
> + if (val & STR_MOST)
> + ret |= TEA575X_MOST;
> + return ret;
Cute. smatch I presume? Tools are useful.
Moving the close parentheses is a pretty common style too
return (val & STR_DATA ? TEA575X_DATA : 0) |
(val & STR_MOST ? TEA575X_MOST : 0);
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()
2012-11-13 8:03 ` Joe Perches
(?)
@ 2012-11-14 8:27 ` Dan Carpenter
-1 siblings, 0 replies; 12+ messages in thread
From: Dan Carpenter @ 2012-11-14 8:27 UTC (permalink / raw)
To: Joe Perches
Cc: alsa-devel, Ondrej Zary, Mauro Carvalho Chehab, Takashi Iwai,
Rusty Russell, kernel-janitors, linux-kernel, Hans de Goede
On Tue, Nov 13, 2012 at 12:03:10AM -0800, Joe Perches wrote:
> On Tue, 2012-11-13 at 10:44 +0300, Dan Carpenter wrote:
> > I don't think this works as intended. '|' higher precedence than ?: so
> > the bitwize OR "0 | (val & STR_MOST)" is a no-op.
> >
> > I have re-written it to be more clear.
> []
> > diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
> []
> > @@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct snd_tea575x *tea)
> > struct es1968 *chip = tea->private_data;
> > unsigned long io = chip->io_port + GPIO_DATA;
> > u16 val = inw(io);
> > -
> > - return (val & STR_DATA) ? TEA575X_DATA : 0 |
> > - (val & STR_MOST) ? TEA575X_MOST : 0;
> > + u8 ret;
> > +
> > + ret = 0;
> > + if (val & STR_DATA)
> > + ret |= TEA575X_DATA;
> > + if (val & STR_MOST)
> > + ret |= TEA575X_MOST;
> > + return ret;
>
> Cute. smatch I presume? Tools are useful.
Yep. This is a smatch thing.
>
> Moving the close parentheses is a pretty common style too
>
> return (val & STR_DATA ? TEA575X_DATA : 0) |
> (val & STR_MOST ? TEA575X_MOST : 0);
That would work as well, of course. I don't have a strong
preference either way.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()
@ 2012-11-14 8:27 ` Dan Carpenter
0 siblings, 0 replies; 12+ messages in thread
From: Dan Carpenter @ 2012-11-14 8:27 UTC (permalink / raw)
To: Joe Perches
Cc: Jaroslav Kysela, Takashi Iwai, Mauro Carvalho Chehab, Ondrej Zary,
Hans de Goede, Rusty Russell, alsa-devel, linux-kernel,
kernel-janitors
On Tue, Nov 13, 2012 at 12:03:10AM -0800, Joe Perches wrote:
> On Tue, 2012-11-13 at 10:44 +0300, Dan Carpenter wrote:
> > I don't think this works as intended. '|' higher precedence than ?: so
> > the bitwize OR "0 | (val & STR_MOST)" is a no-op.
> >
> > I have re-written it to be more clear.
> []
> > diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
> []
> > @@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct snd_tea575x *tea)
> > struct es1968 *chip = tea->private_data;
> > unsigned long io = chip->io_port + GPIO_DATA;
> > u16 val = inw(io);
> > -
> > - return (val & STR_DATA) ? TEA575X_DATA : 0 |
> > - (val & STR_MOST) ? TEA575X_MOST : 0;
> > + u8 ret;
> > +
> > + ret = 0;
> > + if (val & STR_DATA)
> > + ret |= TEA575X_DATA;
> > + if (val & STR_MOST)
> > + ret |= TEA575X_MOST;
> > + return ret;
>
> Cute. smatch I presume? Tools are useful.
Yep. This is a smatch thing.
>
> Moving the close parentheses is a pretty common style too
>
> return (val & STR_DATA ? TEA575X_DATA : 0) |
> (val & STR_MOST ? TEA575X_MOST : 0);
That would work as well, of course. I don't have a strong
preference either way.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()
@ 2012-11-14 8:27 ` Dan Carpenter
0 siblings, 0 replies; 12+ messages in thread
From: Dan Carpenter @ 2012-11-14 8:27 UTC (permalink / raw)
To: Joe Perches
Cc: alsa-devel, Ondrej Zary, Mauro Carvalho Chehab, Takashi Iwai,
Rusty Russell, kernel-janitors, linux-kernel, Hans de Goede
On Tue, Nov 13, 2012 at 12:03:10AM -0800, Joe Perches wrote:
> On Tue, 2012-11-13 at 10:44 +0300, Dan Carpenter wrote:
> > I don't think this works as intended. '|' higher precedence than ?: so
> > the bitwize OR "0 | (val & STR_MOST)" is a no-op.
> >
> > I have re-written it to be more clear.
> []
> > diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
> []
> > @@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct snd_tea575x *tea)
> > struct es1968 *chip = tea->private_data;
> > unsigned long io = chip->io_port + GPIO_DATA;
> > u16 val = inw(io);
> > -
> > - return (val & STR_DATA) ? TEA575X_DATA : 0 |
> > - (val & STR_MOST) ? TEA575X_MOST : 0;
> > + u8 ret;
> > +
> > + ret = 0;
> > + if (val & STR_DATA)
> > + ret |= TEA575X_DATA;
> > + if (val & STR_MOST)
> > + ret |= TEA575X_MOST;
> > + return ret;
>
> Cute. smatch I presume? Tools are useful.
Yep. This is a smatch thing.
>
> Moving the close parentheses is a pretty common style too
>
> return (val & STR_DATA ? TEA575X_DATA : 0) |
> (val & STR_MOST ? TEA575X_MOST : 0);
That would work as well, of course. I don't have a strong
preference either way.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()
2012-11-13 7:44 ` Dan Carpenter
@ 2012-11-14 21:24 ` Ondrej Zary
-1 siblings, 0 replies; 12+ messages in thread
From: Ondrej Zary @ 2012-11-14 21:24 UTC (permalink / raw)
To: Dan Carpenter
Cc: Jaroslav Kysela, Takashi Iwai, Mauro Carvalho Chehab,
Hans de Goede, Rusty Russell, alsa-devel, linux-kernel,
kernel-janitors
On Tuesday 13 November 2012 08:44:54 Dan Carpenter wrote:
> I don't think this works as intended. '|' higher precedence than ?: so
> the bitwize OR "0 | (val & STR_MOST)" is a no-op.
>
> I have re-written it to be more clear.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> I don't have a way to test this.
Thanks for the patch. I tested it and it works.
The same way as without the patch...weird. DATA pin reading works because
that's required for the chip detection. Stereo indication (MOST pin) works
too.
>
> diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
> index 50169bc..7266020 100644
> --- a/sound/pci/es1968.c
> +++ b/sound/pci/es1968.c
> @@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct
> snd_tea575x *tea) struct es1968 *chip = tea->private_data;
> unsigned long io = chip->io_port + GPIO_DATA;
> u16 val = inw(io);
> -
> - return (val & STR_DATA) ? TEA575X_DATA : 0 |
> - (val & STR_MOST) ? TEA575X_MOST : 0;
> + u8 ret;
> +
> + ret = 0;
> + if (val & STR_DATA)
> + ret |= TEA575X_DATA;
> + if (val & STR_MOST)
> + ret |= TEA575X_MOST;
> + return ret;
> }
>
> static void snd_es1968_tea575x_set_direction(struct snd_tea575x *tea, bool
> output) --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
--
Ondrej Zary
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()
@ 2012-11-14 21:24 ` Ondrej Zary
0 siblings, 0 replies; 12+ messages in thread
From: Ondrej Zary @ 2012-11-14 21:24 UTC (permalink / raw)
To: Dan Carpenter
Cc: Jaroslav Kysela, Takashi Iwai, Mauro Carvalho Chehab,
Hans de Goede, Rusty Russell, alsa-devel, linux-kernel,
kernel-janitors
On Tuesday 13 November 2012 08:44:54 Dan Carpenter wrote:
> I don't think this works as intended. '|' higher precedence than ?: so
> the bitwize OR "0 | (val & STR_MOST)" is a no-op.
>
> I have re-written it to be more clear.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> I don't have a way to test this.
Thanks for the patch. I tested it and it works.
The same way as without the patch...weird. DATA pin reading works because
that's required for the chip detection. Stereo indication (MOST pin) works
too.
>
> diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
> index 50169bc..7266020 100644
> --- a/sound/pci/es1968.c
> +++ b/sound/pci/es1968.c
> @@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct
> snd_tea575x *tea) struct es1968 *chip = tea->private_data;
> unsigned long io = chip->io_port + GPIO_DATA;
> u16 val = inw(io);
> -
> - return (val & STR_DATA) ? TEA575X_DATA : 0 |
> - (val & STR_MOST) ? TEA575X_MOST : 0;
> + u8 ret;
> +
> + ret = 0;
> + if (val & STR_DATA)
> + ret |= TEA575X_DATA;
> + if (val & STR_MOST)
> + ret |= TEA575X_MOST;
> + return ret;
> }
>
> static void snd_es1968_tea575x_set_direction(struct snd_tea575x *tea, bool
> output) --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
--
Ondrej Zary
^ permalink raw reply [flat|nested] 12+ messages in thread