On Mon, 23 May 2005, Henk wrote: > Hi, > > I am wondering if something obvouis is staring me in the face, may be > someone on the list can point me in the right direction... > > I am tring to migrate some working test code, using libusb, to a kernel > module. > However the kernel variants seem to crash at the synchronous > usb_control_msg call, whereas the userspace variants seem to be working: > > /* userspace variant (libusb wrapper) */ > err = usb_control_msg(dev_h, > USB_MSG_OUT, /* requesttype = (1 << 5) | 1 */ > 0x9, /* request */ > 0x200, /* value */ > 0x03, /* index */ > CMD[URB_INIT],URB_LENGTH, /* init string 16 bytes long*/ > TIME_OUT); /* timeout = 1600 */ > > > The variant in the kernel module will crash with something like: > ... host controller process error. something bad > ... host controller halted. very bad > > /* KERNEL variant */ > err = usb_control_msg(chip->udev, usb_sndctrlpipe(chip->udev, 0), > 0x9, /* request */ > (1 << 5) | 1, /* requesttype */ > USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, > 0x200, /* value */ > 0x03, /* index */ > CMD[URB_INIT],URB_LENGTH, /* init string 16 bytes long*/ > HZ); /* timeout = 1600 */ > > > I am in the "probe" phase and not within interrupt context, can someone > see what I am doing wrong here?
You're giving the requesttype argument twice. Also your comment about the length of the timeout is wrong. Alan Stern ------------------------------------------------------- This SF.Net email is sponsored by Oracle Space Sweepstakes Want to be the first software developer in space? Enter now for the Oracle Space Sweepstakes! http://ads.osdn.com/?ad_id=7412&alloc_id=16344&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
