Workqueue and kernel panic on device disconnect
Hi,
I'm trying to use a workqueue in a usb driver for polling the states of
the device buttons.
That works fine, but when I disconnect the device, the kernel sometimes
explodes.
The machine turns off immediately, without saving a backtrace (I will
try to make a photo tomorrow)
The code:
static struct delayed_work poll_work;
static const struct usb_device_id device_table[] = {
{USB_DEVICE(0x1234, 0x5678)},
{}
};
static void poll(struct work_struct *work)
{
schedule_delayed_work(&poll_work,
msecs_to_jiffies(100));
}
MODULE_DEVICE_TABLE(usb, device_table);
static int test_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
INIT_DELAYED_WORK(&poll_work, poll);
schedule_delayed_work(&poll_work,
msecs_to_jiffies(100));
return 0;
}
static void test_disconnect(struct usb_interface *intf)
{
cancel_delayed_work_sync(&poll_work);
}
static struct usb_driver test_driver = {
.name = MODULE_NAME,
.id_table = device_table,
.probe = test_probe,
.disconnect = test_disconnect,
};
static int __init test_mod_init(void)
{
return usb_register(&test_driver);
}
static void __exit test_mod_exit(void)
{
usb_deregister(&test_driver);
}
module_init(test_mod_init);
module_exit(test_mod_exit);
What am I doing wrong ?
Is there anything else I have to do in addition to calling
cancel_delayed_work_sync() in the disconnect fcn ?
Thanks,
Frank Schaefer
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Re: Purpose of using __be16 inside a data structure?
On Mon, Oct 24, 2011 at 12:54:41PM -0700, Kevin O'Gorman wrote: > On Tue, Aug 9, 2011 at 12:25 AM, 陳國成 wrote: > > > Hi all, > > > > Please tell me the difference between using unsigned short and __be16 to > > declear a variable in a data structure. [...] > accomplishes this goal. From the name, I expect this to be a 16-bit type. > It may have other attributes, such as a specific endianness (unusual except Yes, it's for 16-bit big-endian data. -- Jonathan Neuschäfer ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Linux 0.02 version download
On Tue, Oct 25, 2011 at 2:52 PM, Adam Lee wrote: > On Tue, Oct 25, 2011 at 10:04:06AM +0200, Christophe Lucas wrote: >> Le 25/10/2011 09:46, Javier Martinez Canillas a écrit : >> > On Tue, Oct 25, 2011 at 9:36 AM, bob wrote: >> >> He's probably doing os dev and wants something simple to learn. Stick with >> >> 0.01 as 0.02 source is lost. Sad face. >> > >> > Yes I know, but I recommend either use a newer kernel or use an >> > operating system that was written for teaching like: >> > >> > http://pdos.csail.mit.edu/6.828/2011/xv6.html >> > >> > I don't want to imagine how hard could be compiling a 0.01 kernel with >> > GCC 4.5 and find a rootfs that is suitable for it. >> >> Hello, >> >> I know it is in french(sorry), but you can also use : >> >> http://sos.enix.org/fr/PagePrincipale >> http://sos.enix.org/fr/SOSDownload#TOC_0_2_25 >> >> Which is a articles series published in a linux magazin in France. It >> becomes from boot to block-devices. >> > > I found this: http://mirrors.kernel.org/oldlinux/Linux.old/kernel/ > > 0.00/ 20-Jan-2005 07:06 > 0.1x/ 04-May-2004 14:09 > 0.95/ 20-Mar-2004 13:10 > 0.96/ 20-Jan-2004 11:46 > 0.97/ 20-Jan-2004 11:46 > 0.98/ 20-Jan-2004 11:46 > 0.99/ 20-Jan-2004 11:46 > 1.00/ 20-Jan-2004 11:46 > Historic/ 20-Mar-2003 22:38 > > 0.02 lost. If you wanna start from oldlinux, 0.11 will be a good choice, > and there is a book about this: http://mirrors.kernel.org/oldlinux/ Try oskit as it is good for learning: http://www.cs.utah.edu/flux/oskit/ Take care. -- Shahbaz Khan ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Linux 0.02 version download
On Tue, Oct 25, 2011 at 10:04:06AM +0200, Christophe Lucas wrote: > Le 25/10/2011 09:46, Javier Martinez Canillas a écrit : > > On Tue, Oct 25, 2011 at 9:36 AM, bob wrote: > >> He's probably doing os dev and wants something simple to learn. Stick with > >> 0.01 as 0.02 source is lost. Sad face. > > > > Yes I know, but I recommend either use a newer kernel or use an > > operating system that was written for teaching like: > > > > http://pdos.csail.mit.edu/6.828/2011/xv6.html > > > > I don't want to imagine how hard could be compiling a 0.01 kernel with > > GCC 4.5 and find a rootfs that is suitable for it. > > Hello, > > I know it is in french(sorry), but you can also use : > > http://sos.enix.org/fr/PagePrincipale > http://sos.enix.org/fr/SOSDownload#TOC_0_2_25 > > Which is a articles series published in a linux magazin in France. It > becomes from boot to block-devices. > I found this: http://mirrors.kernel.org/oldlinux/Linux.old/kernel/ 0.00/ 20-Jan-2005 07:06 0.1x/ 04-May-2004 14:09 0.95/ 20-Mar-2004 13:10 0.96/ 20-Jan-2004 11:46 0.97/ 20-Jan-2004 11:46 0.98/ 20-Jan-2004 11:46 0.99/ 20-Jan-2004 11:46 1.00/ 20-Jan-2004 11:46 Historic/ 20-Mar-2003 22:38 0.02 lost. If you wanna start from oldlinux, 0.11 will be a good choice, and there is a book about this: http://mirrors.kernel.org/oldlinux/ -- Regards, Adam Lee -- E-mail: adam8...@gmail.com Website: http://www.adam8157.info -- ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Linux 0.02 version download
Le 25/10/2011 09:46, Javier Martinez Canillas a écrit : > On Tue, Oct 25, 2011 at 9:36 AM, bob wrote: >> He's probably doing os dev and wants something simple to learn. Stick with >> 0.01 as 0.02 source is lost. Sad face. > > Yes I know, but I recommend either use a newer kernel or use an > operating system that was written for teaching like: > > http://pdos.csail.mit.edu/6.828/2011/xv6.html > > I don't want to imagine how hard could be compiling a 0.01 kernel with > GCC 4.5 and find a rootfs that is suitable for it. > > Best regards, > Hello, I know it is in french(sorry), but you can also use : http://sos.enix.org/fr/PagePrincipale http://sos.enix.org/fr/SOSDownload#TOC_0_2_25 Which is a articles series published in a linux magazin in France. It becomes from boot to block-devices. Best regards, -- Christophe ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Linux 0.02 version download
On Tue, Oct 25, 2011 at 9:36 AM, bob wrote: > He's probably doing os dev and wants something simple to learn. Stick with > 0.01 as 0.02 source is lost. Sad face. Yes I know, but I recommend either use a newer kernel or use an operating system that was written for teaching like: http://pdos.csail.mit.edu/6.828/2011/xv6.html I don't want to imagine how hard could be compiling a 0.01 kernel with GCC 4.5 and find a rootfs that is suitable for it. Best regards, -- Javier Martínez Canillas (+34) 682 39 81 69 Barcelona, Spain ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Linux 0.02 version download
He's probably doing os dev and wants something simple to learn. Stick with 0.01 as 0.02 source is lost. Sad face. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Is there a tool which can generate a small and simple source tree after config?
On Sun, Oct 23, 2011 at 6:29 PM, jiangtao.jit wrote: > Hi: > Hi jiangtao, > While reading the kernel code > 1. the huge amount of files make me scared > there are too many alike functions in different files > sometimes I can't figure out which one was really compiled > 2. too many macros in the definition of a struct or functions declaration > confused me a lot > I tried to follow the generated file autoconf.h to guess the final face > but it's really a difficult thing > > Is there a tool which can generate a small and simple source tree after > config? > not pre-processor Not that I'm aware of. > just generate a small source tree contains the files and dirs which really > will be compiled > and no macros like CONFIG_SMP etc. > according to the configuration > > or some other way to understand the architecture of the final working source > tree? > The Linux kernel is a very complex beast yet it is highly modularized. I recommend you to focus on the specific subsystem that you need to work and don't worry about the rest. To know if a specific file is included in your kernel I usually do this (it works for me but I'm not sure if is the right way to do it): For example if I want to know if the driver to support nand memories on ARM OMAP platforms is included in my kernel. 1- Find the file that implements the driver (drivers/mtd/nand/omap2.c) 2- See which Kconfig symbol determines its compilation: $ fgrep omap2 drivers/mtd/nand/Makefile obj-$(CONFIG_MTD_NAND_OMAP2)+= omap2.o 3- Look if that symbol is included in my config file: $ fgrep MTD_NAND_OMAP2 .config CONFIG_MTD_NAND_OMAP2=y Then I know that my kernels includes that file. Hope it helps, -- Javier Martínez Canillas (+34) 682 39 81 69 Barcelona, Spain ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Linux 0.02 version download
On Tue, Oct 25, 2011 at 4:40 AM, Venkateswarlu P wrote: > I want to download Linux 0.02 version > I anybody knows plese send the link > I already tried in the google > Hi Venkateswarlu, Why do you need such an ancient Linux kernel? If you want to learn from the source code I recommend you a more newer one since people can help you if you have questions about the code. Best regards, -- Javier Martínez Canillas (+34) 682 39 81 69 Barcelona, Spain ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Is there a way to build a cross reference with kernel file
Hello Jimmy, On Mon, Oct 24, 2011 at 5:00 PM, Jimmy Pan wrote: > It seems we can use ctags, while, I don't really know how to implement it. > I don't want to use the online cross reference every time... > Thanks. > Emacs + etags + cscope is for my the best approach to navigate the kernel. A few months ago I wrote a blog post about this, you could take a look: http://martinezjavier.blogspot.com/2011/07/emacs-configuration-for-linux-kernel.html Hope it helps, -- Javier Martínez Canillas (+34) 682 39 81 69 Barcelona, Spain ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
