ALSA: au88x0: use explicitly signed char
Commit Message
With char becoming unsigned by default, and with `char` alone being
ambiguous and based on architecture, signed chars need to be marked
explicitly as such. This fixes warnings like:
sound/pci/au88x0/au88x0_core.c:2029 vortex_adb_checkinout() warn: signedness bug returning '(-22)'
sound/pci/au88x0/au88x0_core.c:2046 vortex_adb_checkinout() warn: signedness bug returning '(-12)'
sound/pci/au88x0/au88x0_core.c:2125 vortex_adb_allocroute() warn: 'vortex_adb_checkinout(vortex, (0), en, 0)' is unsigned
sound/pci/au88x0/au88x0_core.c:2170 vortex_adb_allocroute() warn: 'vortex_adb_checkinout(vortex, stream->resources, en, 4)' is unsigned
As well, since one function returns errnos, return an `int` rather than
a `signed char`.
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: alsa-devel@alsa-project.org
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
sound/pci/au88x0/au88x0.h | 6 +++---
sound/pci/au88x0/au88x0_core.c | 2 +-
2 files changed, 4 insertions(+), 4 deletions(-)
Comments
On Mon, Oct 24, 2022 at 06:29:29PM +0200, Jason A. Donenfeld wrote:
> With char becoming unsigned by default, and with `char` alone being
> ambiguous and based on architecture, signed chars need to be marked
> explicitly as such. This fixes warnings like:
It might make sparse to STFU, but it does *not* resolve the underlying
issue:
vortex_adb_checkinout() returns a number in range of 0..31 on success
and -ENOMEM on failure. Quite a few callers don't bother to check...
Hi Al,
On Mon, Oct 24, 2022 at 11:11 PM Al Viro <viro@zeniv.linux.org.uk> wrote:
>
> On Mon, Oct 24, 2022 at 06:29:29PM +0200, Jason A. Donenfeld wrote:
> > With char becoming unsigned by default, and with `char` alone being
> > ambiguous and based on architecture, signed chars need to be marked
> > explicitly as such. This fixes warnings like:
>
> It might make sparse to STFU, but it does *not* resolve the underlying
> issue:
>
> vortex_adb_checkinout() returns a number in range of 0..31 on success
> and -ENOMEM on failure. Quite a few callers don't bother to check...
Yea, I saw that. I assume that the places that don't check don't
*need* to check. But maybe this driver is junk and other bugs lurk.
I'm not sure. Either way, I think this change is certainly an
improvement on the status quo. I don't intend to develop further on
it, but feel free to send patches atop once this lands.
Jason
On Tue, 25 Oct 2022 01:59:50 +0200,
Jason A. Donenfeld wrote:
>
> Hi Al,
>
> On Mon, Oct 24, 2022 at 11:11 PM Al Viro <viro@zeniv.linux.org.uk> wrote:
> >
> > On Mon, Oct 24, 2022 at 06:29:29PM +0200, Jason A. Donenfeld wrote:
> > > With char becoming unsigned by default, and with `char` alone being
> > > ambiguous and based on architecture, signed chars need to be marked
> > > explicitly as such. This fixes warnings like:
> >
> > It might make sparse to STFU, but it does *not* resolve the underlying
> > issue:
> >
> > vortex_adb_checkinout() returns a number in range of 0..31 on success
> > and -ENOMEM on failure. Quite a few callers don't bother to check...
>
> Yea, I saw that. I assume that the places that don't check don't
> *need* to check. But maybe this driver is junk and other bugs lurk.
> I'm not sure. Either way, I think this change is certainly an
> improvement on the status quo. I don't intend to develop further on
> it, but feel free to send patches atop once this lands.
Yes, the driver is likely broken in some other way, too.
Such a corner case doesn't hit usually, and it's unlikely worth to
spend too much time on it.
In anyway, I applied the patch now to for-next branch.
Thanks!
Takashi
@@ -141,7 +141,7 @@ struct snd_vortex {
#ifndef CHIP_AU8810
stream_t dma_wt[NR_WT];
wt_voice_t wt_voice[NR_WT]; /* WT register cache. */
- char mixwt[(NR_WT / NR_WTPB) * 6]; /* WT mixin objects */
+ s8 mixwt[(NR_WT / NR_WTPB) * 6]; /* WT mixin objects */
#endif
/* Global resources */
@@ -235,8 +235,8 @@ static int vortex_alsafmt_aspfmt(snd_pcm_format_t alsafmt, vortex_t *v);
static void vortex_connect_default(vortex_t * vortex, int en);
static int vortex_adb_allocroute(vortex_t * vortex, int dma, int nr_ch,
int dir, int type, int subdev);
-static char vortex_adb_checkinout(vortex_t * vortex, int resmap[], int out,
- int restype);
+static int vortex_adb_checkinout(vortex_t * vortex, int resmap[], int out,
+ int restype);
#ifndef CHIP_AU8810
static int vortex_wt_allocroute(vortex_t * vortex, int dma, int nr_ch);
static void vortex_wt_connect(vortex_t * vortex, int en);
@@ -1998,7 +1998,7 @@ static const int resnum[VORTEX_RESOURCE_LAST] =
out: Mean checkout if != 0. Else mean Checkin resource.
restype: Indicates type of resource to be checked in or out.
*/
-static char
+static int
vortex_adb_checkinout(vortex_t * vortex, int resmap[], int out, int restype)
{
int i, qty = resnum[restype], resinuse = 0;