平台驱动程序模板无法正常工作 [英] A platform driver template not working as it should
问题描述
我正在尝试创建一个简单的平台驱动程序，但是我不知道为什么它不起作用.这是我尝试构建的代码.
Insmod很干净，但是与rmmod一起存在一些隐秘消息.
以及我应该添加什么细节，以便该编辑器满足.........
I am trying to create a simple platform driver but i don't know why its not working. Here is the code that i am trying to build.
Insmod is clean but there are some cryptic messages along with rmmod.
and what details i should add so this editor satisfies.........
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
MODULE_LICENSE("GPL");
static struct platform_device *dev;
static int my_probe(struct platform_device *pdev)
{
printk("probe called, means device and driver are now associated\n");
return 0;
}
static struct platform_driver my_driver = {
.driver = {
.name = "m_driver",
},
.probe = my_probe,
};
static int __init my_init(void)
{
int ret;
/*register a platform driver*/
ret = platform_driver_register(&my_driver);
if(ret == 0 )
printk("<1>" "platform driver registered\n");
dev = platform_device_alloc("m_driver", -1);
if (!dev)
return -ENOMEM;
ret = platform_device_add(dev);
if (ret != 0) {
printk("<1>" "platform driver could not be added\n");
goto undo_malloc;
}
printk("<1>" "platform driver installed\n");
undo_malloc:
platform_device_put(dev);
return ret;
}
module_init(my_init);
static void __exit my_cleanup(void)
{
/* Unregister driver */
platform_driver_unregister(&my_driver);
platform_device_unregister(dev);
printk("<1>" "over\n");
return;
}
module_exit(my_cleanup);
Few part of the code is commented just to keep things minimal.After insmod ,in rmmod the dmesg is filled with messages as rmmod tainted and call trace and addresses .What i am doing wrong?
这是rmmod日志表单终端
This is the rmmod log form terminal
WARNING: at /build/buildd/linux-3.2.0/fs/sysfs/inode.c:324 sysfs_hash_and_remove+0x92/0xa0()
[ 3106.861968] Hardware name: VMware Virtual Platform
[ 3106.861972] sysfs: can not remove 'driver', no directory
[ 3106.861976] Modules linked in: uiyn(O-) test1(O-) isofs vmwgfx ttm drm bnep rfcomm bluetooth snd_ens1371 gameport snd_ac97_codec ac97_bus snd_pcm ppdev snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq vmw_balloon psmouse snd_timer snd_seq_device serio_raw uvcvideo videodev snd soundcore snd_page_alloc i2c_piix4 parport_pc mac_hid shpchp lp parport pcnet32 mptspi mptscsih mptbase floppy [last unloaded: uiyn]
[ 3106.862043] Pid: 2600, comm: rmmod Tainted: G D W O 3.2.0-29-generic-pae #46-Ubuntu
[ 3106.862047] Call Trace:
[ 3106.862058] [<c105a182>] warn_slowpath_common+0x72/0xa0
[ 3106.862069] [<c11a59f2>] ? sysfs_hash_and_remove+0x92/0xa0
[ 3106.862077] [<c11a59f2>] ? sysfs_hash_and_remove+0x92/0xa0
[ 3106.862084] [<c105a253>] warn_slowpath_fmt+0x33/0x40
[ 3106.862090] [<c11a59f2>] sysfs_hash_and_remove+0x92/0xa0
[ 3106.862099] [<c11a7b50>] sysfs_remove_link+0x20/0x30
[ 3106.862112] [<c13842da>] driver_sysfs_remove+0x2a/0x30
[ 3106.862119] [<c1384304>] __device_release_driver+0x24/0xb0
[ 3106.862126] [<c13843b4>] device_release_driver+0x24/0x40
[ 3106.862133] [<c1383f2a>] bus_remove_device+0x5a/0x80
[ 3106.862140] [<c1381c47>] device_del+0xe7/0x150
[ 3106.862147] [<c13860a8>] platform_device_del+0x18/0x70
[ 3106.862153] [<c13863b0>] platform_device_unregister+0x10/0x20
[ 3106.862163] [<e0a6e02a>] my_cleanup+0xe/0xfe4 [uiyn]
[ 3106.862170] [<e0a6e01c>] ? my_probe+0x1c/0x1c [uiyn]
[ 3106.862179] [<c1094be5>] sys_delete_module+0x135/0x230
[ 3106.862189] [<c111b63a>] ? do_munmap+0x16a/0x200
[ 3106.862197] [<c15ac7df>] sysenter_do_call+0x12/0x28
[ 3106.862208] ---[ end trace 8a59e3572e4fd8eb ]---
[ 3106.863592] over
我检查了/sys/modules并且这些模块仍然在rmmod之后，因此我每次都要更改名称.我需要知道 1)如果我正在做一些明显的错误 2)有没有办法了解这个错误日志 3)我的内核版本是否与此矿有关:3.2.0-29 任何提示都会有所帮助.
I checked /sys/modules and these modules are still after rmmod ,there so i have to change name everytime.I need to know 1) If I am doing some obvious error 2) Is there a way to understand this error logs 3) Is my kernel version have to do with this mine: 3.2.0-29 Any hint will be helpful..
推荐答案
代码中有两次更正.
1)在my_init()中，您应该在此处添加return函数，以避免在成功添加设备的情况下调用platform_device_put().
1) In my_init() you should add return function here to avoid calling platform_device_put() in case of success of device adding.
返回ret； //如果成功添加了设备，则返回.
ret = platform_device_add(dev);
if (ret != 0) {
printk("<1>" "platform driver could not be added\n");
goto undo_malloc;
}
printk("<1>" "platform driver installed\n");
return ret; // if device is added succesfully then return.
undo_malloc:
platform_device_put(dev);
return ret;
2)在my_cleanup()中始终先注销所有设备，然后再注销驱动程序...
2) in my_cleanup() always unregistered all devices first and then unregistered your driver...
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