Hi, I'm getting the following crash when unloading ohci-hcd module on custom 460EX platform:
-bash-3.2# rmmod ohci-hcd ppc-of-ohci 4bffd0000.usb: remove, state 1 usb usb1: USB disconnect, address 1 usb 1-1: USB disconnect, address 2 ppc-of-ohci 4bffd0000.usb: USB bus 1 deregistered Trying to install chip for IRQ-1 ------------[ cut here ]------------ Badness at c0044dd8 [verbose debug info unavailable] NIP: c0044dd8 LR: c0044dd8 CTR: c0106bb4 REGS: dfa27cf0 TRAP: 0700 Not tainted (2.6.28-rc9) MSR: 00029000 <EE,ME> CR: 22000082 XER: 20000004 TASK = df874c30[468] 'rmmod' THREAD: dfa26000 GPR00: c0044dd8 dfa27da0 df874c30 00000024 00001a85 ffffffff c01071f0 00020000 GPR08: 00000001 c0232c74 00001a85 00000001 24000084 1004a180 00000000 00000000 GPR16: 101017e8 1009e4f0 100f0000 10043008 00000000 bfae0070 10001be4 bfae007c GPR24: bfae0078 00000000 bfae0080 00000880 00000000 ffffffff e4fa79a8 00000000 NIP [c0044dd8] set_irq_chip+0x4c/0x98 LR [c0044dd8] set_irq_chip+0x4c/0x98 Call Trace: [dfa27da0] [c0044dd8] set_irq_chip+0x4c/0x98 (unreliable) [dfa27dc0] [c0044e84] set_irq_chip_and_handler+0x1c/0x40 [dfa27de0] [c0003570] irq_dispose_mapping+0x5c/0x158 [dfa27e00] [e4fa2d70] ohci_hcd_ppc_of_remove+0x34/0x70 [ohci_hcd] [dfa27e20] [c011f9dc] of_platform_device_remove+0x30/0x44 [dfa27e30] [c010d4f0] __device_release_driver+0x84/0xb0 [dfa27e40] [c010d588] driver_detach+0x6c/0xa8 [dfa27e60] [c010c5b8] bus_remove_driver+0x9c/0xd8 [dfa27e80] [c010dacc] driver_unregister+0x48/0x5c [dfa27ea0] [c011fae0] of_unregister_driver+0x14/0x24 [dfa27eb0] [e4fa4cc0] ohci_hcd_mod_exit+0x28/0x400 [ohci_hcd] [dfa27ed0] [c0040b50] sys_delete_module+0x1ac/0x218 [dfa27f40] [c000cab8] ret_from_syscall+0x0/0x3c Instruction dump: 7f830040 7c9f2378 409c0018 1c03003c 3d20c022 39291594 7fc04a15 40a20020 3c60c01d 7d645b78 3863fbe8 4bfd954d <0fe00000> 3860ffea 48000030 2f840000 This happens because by the moment irq_dispose_mapping(hcd->irq) is invoked from ohci_hcd_ppc_of_remove() (in drivers/usb/host/ohci-ppc-of.c) hcd->irq is set to -1 by ohci_stop(). I'm not sure what is the correct way to fix the crash. I've modified ohci_stop() not to free irq and set hcd->irq to -1 if CONFIG_USB_OHCI_HCD_PPC_OF is defined, and that fixed the crash. But maybe this is not the best way to fix it. Felix. -- View this message in context: http://www.nabble.com/Kernel-crash-on-ohci-hcd-unloading-in-2.6.28-rc9-tp21116726p21116726.html Sent from the linuxppc-dev mailing list archive at Nabble.com. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
