From: Sascha Hauer <s.hauer@pengutronix.de>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 1/7] driver: introduce less error-prone dev_get_drvdata alternative
Date: Tue, 29 Sep 2020 08:45:38 +0200 [thread overview]
Message-ID: <20200929064538.GO11648@pengutronix.de> (raw)
In-Reply-To: <20200928154247.15619-1-a.fatoum@pengutronix.de>
On Mon, Sep 28, 2020 at 05:42:41PM +0200, Ahmad Fatoum wrote:
> We use dev_get_drvdata to get the driver match data associated with a
> device. This has two shortcomings:
>
> - Linux has dev_get_drvdata too, which returns a private pointer for
> driver specific info to associate with a device. We use dev->priv
> (or more often container_of) for that in barebox instead
>
> - It nearly always involves a cast to a double pointer, which is
> error-prone as size and alignment match need to be ensured
> on the programmer's part and can easily be gotten wrong:
> enum dev_type type
> dev_get_drvdata(dev, (const void **)&type);
>
> Add a new function that instead of using a double pointer argument,
> returns the pointer directly:
>
> - For normal pointer driver data, no cast is necessary
> - For integer driver data casted to a pointer for storage,
> the cast is still necessary, but
but what?
Sascha
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next prev parent reply other threads:[~2020-09-29 6:45 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-28 15:42 Ahmad Fatoum
2020-09-28 15:42 ` [PATCH 2/7] led: pca955x: fix probing from device tree Ahmad Fatoum
2020-09-29 7:19 ` Sascha Hauer
2020-09-30 7:28 ` Ahmad Fatoum
2020-09-28 15:42 ` [PATCH 3/7] dma: apbh: fix out-of-bounds write on 64-bit SoCs Ahmad Fatoum
2020-09-28 15:42 ` [PATCH 4/7] aiodev: lm75: " Ahmad Fatoum
2020-09-28 15:42 ` [PATCH 5/7] mtd: nand-mxs: " Ahmad Fatoum
2020-09-28 16:01 ` Marco Felsch
2020-09-28 16:03 ` Ahmad Fatoum
2020-09-28 16:08 ` Marco Felsch
2020-09-28 15:42 ` [PATCH 6/7] video: imx-hdmi: fix dev_get_drvdata misuse Ahmad Fatoum
2020-09-28 15:42 ` [PATCH 7/7] driver: migrate some from dev_get_drvdata to device_get_match_data Ahmad Fatoum
2020-09-28 15:46 ` [PATCH 1/7] driver: introduce less error-prone dev_get_drvdata alternative Ahmad Fatoum
2020-09-29 6:45 ` Sascha Hauer [this message]
2020-09-29 7:32 ` Sascha Hauer
2020-09-29 9:42 ` Ahmad Fatoum
2020-09-30 7:48 ` Sascha Hauer
2020-09-30 13:13 ` Ahmad Fatoum
2020-10-05 8:31 ` Ahmad Fatoum
2020-10-07 8:43 ` Sascha Hauer
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