On Wed, Mar 30, 2011 at 10:32 AM, sword li <sword.l.dragon@xxxxxxxxx> wrote: > Hi, All > when I write data to USB general serial, sometimes encounter the problem > "scheduling while atomic" problem, and it is very similar with this: > > http://kerneltrap.org/mailarchive/linux-usb/2010/4/6/6259986 > > and I also find there is a patch: > http://marc.info/?l=linux-usb&m=126405382220848&w=2 > > my kernel is 2.6.32. now with kernel 2.6.38, I find this patch wasn't applied. > so , is the problem resolved? can anyone give me an advice? > Please note that below patch was merged in the kernel to fix this warning. commit 44a0c0190b500ee6bcfc0976fe540f65dee2cd67 Author: Jon Povey <jon.povey@xxxxxxxxxxxxxxx> Date: Mon Jun 14 19:41:04 2010 +0900 USB: g_serial: don't set low_latency flag No longer set low_latency flag as it causes this warning backtrace: WARNING: at kernel/mutex.c:207 __mutex_lock_slowpath+0x6c/0x288() Fix associated locking and wakeups. Signed-off-by: Jon Povey <jon.povey@xxxxxxxxxxxxxxx> Cc: Maulik Mankad <x0082077@xxxxxx> Cc: stable <stable@xxxxxxxxxx> Acked-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx> You can see "git log" of drivers/usb/gadget/u_serial.c for latest kernel to confirm this. Regards, Maulik -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
