usb mass storage ADSC cmd
Hi there, I am trying to implement a communication between the host and a usb mass storage device using ADSC cmd. The device is using the g_mass_storage gadget driver. So far, broken pipe (-32) from the host side is all what I have got. My questions are: 1. Could the device support ADSC cmd even it is using SCSI transport instead of CBI transport? 2. Is this composite correct for the host to retrieve 1 byte response from the device using ADSC? usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0, // ADSC USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, // type 0, // value 0, // index buf,// recv buf 1, // size 10*HZ); // timeout Thanks, Dave Tian dave.jing.t...@gmail.com ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Delay in Printk Messages.
Hello Arun Kumar,
On Sat, 28. Jun 23:03, Arun Kumar wrote:
> I am able to read my printk messages in the kernel buffer only after
> unloading the module..
> Is there some reason or configuration behind this.
>
> I used a simple kernel module with only init and exit functions, and
> after loading the module i cannot see the message printed by the
> "module_init" function in the output given by "dmesg -c" I can see them
> only after i unload the module.
>
Since you do not provide your code I have to guess that your print
statement looks like this:
pr_debug("Hello World!");
Please notice that printk doesn't flush until a trailing newline is
provided (Linux Device Drivers Chapter 4). So maybe this is what you want:
pr_debug("Hello World!\n");
> i wait for around 15-20 seconds for the init message but it only shows
> up on removing the module.
>
> ___
> Kernelnewbies mailing list
> Kernelnewbies@kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
With best regards
Michael Hornung
___
Kernelnewbies mailing list
Kernelnewbies@kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Delay in Printk Messages.
Try echo "7" > /proc/sys/kernel/printk to enable all console log levels. The numbers are corresponding to below: #define KERN_EMERG "<0>" /* system is unusable*/ #define KERN_ALERT "<1>" /* action must be taken immediately*/ #define KERN_CRIT "<2>" /* critical conditions*/ #define KERN_ERR "<3>" /* error conditions*/ #define KERN_WARNING "<4>" /* warning conditions*/ #define KERN_NOTICE "<5>" /* normal but significant condition*/ #define KERN_INFO "<6>" /* informational*/ #define KERN_DEBUG "<7>" /* debug-level messages*/ The default number is 4, which allows console to show messages only at least in KERN_WARNING. That could be why you cannot see log in KERN_INFO level. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Delay in Printk Messages.
Try 'sysctl kernel.printk=7' where 7 is one of the levels defined in "include/linux/kern_levels.h". On Sat, Jun 28, 2014 at 7:33 PM, Arun Kumar wrote: > I am able to read my printk messages in the kernel buffer only after > unloading the module.. > Is there some reason or configuration behind this. > > I used a simple kernel module with only init and exit functions, and > after loading the module i cannot see the message printed by the > "module_init" function in the output given by "dmesg -c" I can see them > only after i unload the module. > > i wait for around 15-20 seconds for the init message but it only shows > up on removing the module. > > ___ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Delay in Printk Messages.
I am able to read my printk messages in the kernel buffer only after unloading the module.. Is there some reason or configuration behind this. I used a simple kernel module with only init and exit functions, and after loading the module i cannot see the message printed by the "module_init" function in the output given by "dmesg -c" I can see them only after i unload the module. i wait for around 15-20 seconds for the init message but it only shows up on removing the module. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Eudyptula Challenge How To Prepare
Read The LInux Device Drivers Book :) On Sat, Jun 28, 2014 at 10:57 AM, me storage wrote: > Hi > I have been waiting for my Task 04 Result from last 3 days .I know so many > people are waiting more than this.So can one please tell me How to prepare > for the next Task i.e what are the concepts necessary topics for Task 05? > Thanks > > ___ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Kernel memory leak
On Saturday 28 June 2014 12:29 PM, Santhosh Kumar wrote: > > Is there a way to trace the allocations of memory from different buckets of > kmalloc ? You could try out kmemleak - https://www.kernel.org/doc/Documentation/kmemleak.txt ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Kernel memory leak
I am suspecting a memory leak in a kernel module that does layer 2 switching of data packets. In the vmstat -m output the Num and Total keeps going up for the kmalloc-512.. kmalloc-512 15232 15264512 16 Is this a clear indication of leak in the kernel or can there be false positives ? Is there a way to trace the allocations of memory from different buckets of kmalloc ? -Santhosh. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
