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![Julia Lawall](/assets/img/avatar_default.png)
Error handling code following a kzalloc should free the allocated data. The semantic match that finds the problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @r exists@ local idexpression x; statement S; expression E; identifier f,f1,l; position p1,p2; expression *ptr != NULL; @@ x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...); ... if (x == NULL) S <... when != x when != if (...) { <+...x...+> } ( x->f1 = E | (x->f1 == NULL || ...) | f(...,x->f1,...) ) ...> ( return \(0\|<+...x...+>\|ptr\); | return@p2 ...; ) @script:python@ p1 << r.p1; p2 << r.p2; @@ print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Cc: David Brownell <david-b@pacbell.net> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
231 lines
5.5 KiB
C
231 lines
5.5 KiB
C
/*
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* A driver for the RTC embedded in the Cirrus Logic EP93XX processors
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* Copyright (c) 2006 Tower Technologies
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*
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#define EP93XX_RTC_DATA 0x000
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#define EP93XX_RTC_MATCH 0x004
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#define EP93XX_RTC_STATUS 0x008
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#define EP93XX_RTC_STATUS_INTR (1<<0)
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#define EP93XX_RTC_LOAD 0x00C
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#define EP93XX_RTC_CONTROL 0x010
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#define EP93XX_RTC_CONTROL_MIE (1<<0)
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#define EP93XX_RTC_SWCOMP 0x108
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#define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000
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#define EP93XX_RTC_SWCOMP_DEL_SHIFT 16
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#define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff
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#define EP93XX_RTC_SWCOMP_INT_SHIFT 0
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#define DRV_VERSION "0.3"
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/*
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* struct device dev.platform_data is used to store our private data
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* because struct rtc_device does not have a variable to hold it.
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*/
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struct ep93xx_rtc {
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void __iomem *mmio_base;
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};
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static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,
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unsigned short *delete)
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{
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struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
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unsigned long comp;
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comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
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if (preload)
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*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
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>> EP93XX_RTC_SWCOMP_INT_SHIFT;
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if (delete)
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*delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
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>> EP93XX_RTC_SWCOMP_DEL_SHIFT;
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return 0;
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}
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static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
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unsigned long time;
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time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
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rtc_time_to_tm(time, tm);
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return 0;
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}
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static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
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{
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struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
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__raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
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return 0;
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}
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static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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unsigned short preload, delete;
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ep93xx_rtc_get_swcomp(dev, &preload, &delete);
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seq_printf(seq, "preload\t\t: %d\n", preload);
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seq_printf(seq, "delete\t\t: %d\n", delete);
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return 0;
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}
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static const struct rtc_class_ops ep93xx_rtc_ops = {
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.read_time = ep93xx_rtc_read_time,
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.set_mmss = ep93xx_rtc_set_mmss,
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.proc = ep93xx_rtc_proc,
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};
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static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned short preload;
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ep93xx_rtc_get_swcomp(dev, &preload, NULL);
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return sprintf(buf, "%d\n", preload);
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}
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static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);
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static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned short delete;
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ep93xx_rtc_get_swcomp(dev, NULL, &delete);
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return sprintf(buf, "%d\n", delete);
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}
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static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);
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static int __init ep93xx_rtc_probe(struct platform_device *pdev)
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{
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struct ep93xx_rtc *ep93xx_rtc;
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struct resource *res;
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struct rtc_device *rtc;
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int err;
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ep93xx_rtc = kzalloc(sizeof(struct ep93xx_rtc), GFP_KERNEL);
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if (ep93xx_rtc == NULL)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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err = -ENXIO;
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goto fail_free;
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}
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res = request_mem_region(res->start, resource_size(res), pdev->name);
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if (res == NULL) {
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err = -EBUSY;
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goto fail_free;
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}
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ep93xx_rtc->mmio_base = ioremap(res->start, resource_size(res));
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if (ep93xx_rtc->mmio_base == NULL) {
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err = -ENXIO;
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goto fail;
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}
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pdev->dev.platform_data = ep93xx_rtc;
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rtc = rtc_device_register(pdev->name,
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&pdev->dev, &ep93xx_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc)) {
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err = PTR_ERR(rtc);
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goto fail;
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}
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platform_set_drvdata(pdev, rtc);
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err = device_create_file(&pdev->dev, &dev_attr_comp_preload);
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if (err)
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goto fail;
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err = device_create_file(&pdev->dev, &dev_attr_comp_delete);
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if (err) {
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device_remove_file(&pdev->dev, &dev_attr_comp_preload);
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goto fail;
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}
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return 0;
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fail:
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if (ep93xx_rtc->mmio_base) {
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iounmap(ep93xx_rtc->mmio_base);
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pdev->dev.platform_data = NULL;
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}
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release_mem_region(res->start, resource_size(res));
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fail_free:
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kfree(ep93xx_rtc);
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return err;
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}
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static int __exit ep93xx_rtc_remove(struct platform_device *pdev)
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{
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struct rtc_device *rtc = platform_get_drvdata(pdev);
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struct ep93xx_rtc *ep93xx_rtc = pdev->dev.platform_data;
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struct resource *res;
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/* cleanup sysfs */
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device_remove_file(&pdev->dev, &dev_attr_comp_delete);
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device_remove_file(&pdev->dev, &dev_attr_comp_preload);
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rtc_device_unregister(rtc);
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iounmap(ep93xx_rtc->mmio_base);
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pdev->dev.platform_data = NULL;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(res->start, resource_size(res));
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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/* work with hotplug and coldplug */
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MODULE_ALIAS("platform:ep93xx-rtc");
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static struct platform_driver ep93xx_rtc_driver = {
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.driver = {
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.name = "ep93xx-rtc",
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.owner = THIS_MODULE,
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},
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.remove = __exit_p(ep93xx_rtc_remove),
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};
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static int __init ep93xx_rtc_init(void)
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{
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return platform_driver_probe(&ep93xx_rtc_driver, ep93xx_rtc_probe);
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}
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static void __exit ep93xx_rtc_exit(void)
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{
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platform_driver_unregister(&ep93xx_rtc_driver);
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}
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("EP93XX RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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module_init(ep93xx_rtc_init);
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module_exit(ep93xx_rtc_exit);
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