a823e76138
Since we cannot make sure the 'pdata->num_leds' will always be none zero here, and then if it equals to zero, the kmemdup() will return ZERO_SIZE_PTR, which equals to ((void *)16). So this patch fix this with just doing the zero check before calling kmemdup(). Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/*
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* Copyright (C) 2011 Pengutronix
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* Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License version 2 as published by the
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* Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/leds.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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/**
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* gpio_led_register_device - register a gpio-led device
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* @pdata: the platform data used for the new device
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*
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* Makes a copy of pdata and pdata->leds and registers a new leds-gpio device
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* with the result. This allows to have pdata and pdata-leds in .init.rodata
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* and so saves some bytes compared to a static struct platform_device with
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* static platform data.
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*
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* Returns the registered device or an error pointer.
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*/
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struct platform_device *__init gpio_led_register_device(
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int id, const struct gpio_led_platform_data *pdata)
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{
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struct platform_device *ret;
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struct gpio_led_platform_data _pdata = *pdata;
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if (!pdata->num_leds)
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return ERR_PTR(-EINVAL);
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_pdata.leds = kmemdup(pdata->leds,
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pdata->num_leds * sizeof(*pdata->leds), GFP_KERNEL);
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if (!_pdata.leds)
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return ERR_PTR(-ENOMEM);
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ret = platform_device_register_resndata(NULL, "leds-gpio", id,
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NULL, 0, &_pdata, sizeof(_pdata));
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if (IS_ERR(ret))
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kfree(_pdata.leds);
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return ret;
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}
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