I am writing a USB driver modeled on the drivers/usb/usb-skeleton.c version 2.6.30 but it gets the following warning. I wonder if it is a generic issue, perhaps the skeleton is not maintained any more? Alternatively perhaps I haven't implemented things properly. If so is there a reference explain the right way? I couldn't find anything on google. Looking at another driver (e.g.drivers/usb/serial/aircable.c) it appears this isn't done anymore and flags are used in the callback functions along with permanently assigned urbs? If so perhaps this should be updated? Suggestions appreciated. Thanks Andrew ... usb 1-5: jtag_release() usb 1-5: jtag_open() usb 1-5: jtag_read(file=ded6e3c0, buf=092f8440, count=512,..) usb 1-5: jtag_flush() usb 1-5: jtag_release() usb 1-5: jtag_open() usb 1-5: jtag_write(file=df0ebe40, buf=093783f0, count=2506,..) usb 1-5: jtag_flush() usb 1-5: jtag_release() ------------[ cut here ]------------ WARNING: at /tmp/9789a690-d005-11df-8a73-00241dc62196/voyage-linux-2.6.30/arch/x86/include/asm/dma-mapping.h:294 hcd_buffer_free+0x85/0xb9 [usbcore]() Hardware name: POULSBO Modules linked in: ctam_ftdi ipv6 tun e1000e ata_piix usb_storage ff_memless intel_agp agpgart loop hwmon_vid hostap_pci hostap lib80211 natsemi serio_raw p cspkr asix pl2303 usbnet ftdi_sio usbserial usbhid i2c_isch hid evdev ext3 jbd mbcache sd_mod pata_sch ata_generic libata uhci_hcd ehci_hcd scsi_mod ide_pci _generic r8169 mii usbcore amd74xx lm90 led_class ide_generic ide_core [last unloaded: ctam_ftdi] Pid: 2234, comm: loadFPGA Tainted: G W 2.6.30.10-robin-z5xx #1 Call Trace: [<c0126a04>] ? warn_slowpath_common+0x5e/0x8a [<c0126a3a>] ? warn_slowpath_null+0xa/0xc [<dff512d1>] ? hcd_buffer_free+0x85/0xb9 [usbcore] [<e043b328>] ? jtag_write_bulk_callback+0x55/0x61 [ctam_ftdi] [<dff4c1e2>] ? usb_hcd_giveback_urb+0x60/0x8f [usbcore] [<dfffde94>] ? ehci_urb_done+0x9d/0xa9 [ehci_hcd] [<dffff42d>] ? qh_completions+0x359/0x3e9 [ehci_hcd] [<dffff552>] ? ehci_work+0x95/0x782 [ehci_hcd] [<e016f5c1>] ? serial_write+0x72/0x7d [usbserial] [<c0175aa5>] ? handle_mm_fault+0x293/0x5f4 [<e00024f9>] ? ehci_irq+0x171/0x1c4 [ehci_hcd] [<dff4beca>] ? usb_hcd_irq+0x2f/0x6c [usbcore] [<c0156287>] ? handle_IRQ_event+0x4e/0x101 [<c0157510>] ? handle_fasteoi_irq+0x66/0x97 [<c0104def>] ? handle_irq+0x17/0x1b [<c010485d>] ? do_IRQ+0x38/0x76 [<c0103569>] ? common_interrupt+0x29/0x30 ---[ end trace 7b48bc9372419b94 ]--- usb 1-5: jtag_open() usb 1-5: jtag_flush() usb 1-5: jtag_read(file=de7748c0, buf=09a63000, count=512,..) usb 1-5: jtag_flush() usb 1-5: jtag_release() -- 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
