From: David Laight <David.Laight@ACULAB.COM>
To: 'Mark Brown' <broonie@kernel.org>
Cc: 'Shengjiu Wang' <shengjiu.wang@nxp.com>,
"shengjiu.wang@gmail.com" <shengjiu.wang@gmail.com>,
"Xiubo.Lee@gmail.com" <Xiubo.Lee@gmail.com>,
"festevam@gmail.com" <festevam@gmail.com>,
"nicoleotsuka@gmail.com" <nicoleotsuka@gmail.com>,
"lgirdwood@gmail.com" <lgirdwood@gmail.com>,
"perex@perex.cz" <perex@perex.cz>,
"tiwai@suse.com" <tiwai@suse.com>,
"alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH -next 2/5] ASoC: fsl_asrc: force cast the asrc_format type
Date: Tue, 19 Jul 2022 10:34:44 +0000 [thread overview]
Message-ID: <20cfcc8e59a74166846cff028cd2c4e8@AcuMS.aculab.com> (raw)
In-Reply-To: <YtaEpf6Cd7KH7wH4@sirena.org.uk>
From: Mark Brown
> Sent: 19 July 2022 11:17
>
> On Tue, Jul 19, 2022 at 10:01:54AM +0000, David Laight wrote:
> > From: Shengjiu Wang
>
> > > - ret = of_property_read_u32(np, "fsl,asrc-format", &asrc->asrc_format);
> > > + ret = of_property_read_u32(np, "fsl,asrc-format", (u32 *)&asrc->asrc_format);
>
> > Ugg, you really shouldn't need to do that.
> > It means that something is badly wrong somewhere.
> > Casting pointers to integer types is just asking for a bug.
>
> That's casting one pointer type to another pointer type.
It is casting the address of some type to a 'u32 *'.
This will then be dereferenced by the called function.
So the original type better be 32 bits.
I'm also guessing that sparse was complaining about endianness?
It isn't at all clear that these casts actually fix it.
(Mark: You'll be glad to hear that the office aircon is
broken again - two weeks lead time on the spare part.)
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2022-07-19 10:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-19 9:27 [PATCH -next 0/5] ASoC: fsl: Fix sparse warning Shengjiu Wang
2022-07-19 9:27 ` [PATCH -next 1/5] ASoC: fsl_sai: Don't use plain integer as NULL pointer Shengjiu Wang
2022-07-19 9:27 ` [PATCH -next 2/5] ASoC: fsl_asrc: force cast the asrc_format type Shengjiu Wang
2022-07-19 10:01 ` David Laight
2022-07-19 10:17 ` Mark Brown
2022-07-19 10:34 ` David Laight [this message]
2022-07-19 9:27 ` [PATCH -next 3/5] ASoC: fsl-asoc-card: " Shengjiu Wang
2022-07-19 9:27 ` [PATCH -next 4/5] ASoC: fsl_easrc: use snd_pcm_format_t type for sample_format Shengjiu Wang
2022-07-19 9:27 ` [PATCH -next 5/5] ASoC: imx-card: use snd_pcm_format_t type for asrc_format Shengjiu Wang
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