Hi Alan, hi all, > > I can also produce the freeze on 3.17, with some extra steps: > > Okay, that's worth knowing. > > > (after boot there's just the ehci-pci bus with no device) > > - unbind ehci-pci > > - bind ehci-pci > > During both the unbind and the bind, the debugging lines you added to > ehci-hcd.c should show up. Do they? I'm afraid my statement wasn't entirely accurate. I was using a precompiled kernel 3.17.8 (not 3.17 plain) without my debugging lines. >From the regular kernel debug output, I get: (first unbind) ehci-pci 0000:00:1d.0: remove, state 4 usb usb1: USB disconnect, device number 1 ehci-pci 0000:00:1d.0: USB bus 1 deregistered (bind) ehci-pci 0000:00:1d.0: EHCI Host Controller ehci-pci 0000:00:1d.0: new USB bus registered, assigned bus number 1 ehci-pci 0000:00:1d.0: debug port 2 ehci-pci 0000:00:1d.0: cache line size of 64 is not supported ehci-pci 0000:00:1d.0: irq 23, io mem 0x90918000 ehci-pci 0000:00:1d.0: USB 2.0 started, EHCI 1.00 usb usb1: New USB device found, idVendor=1d6b, idProduct=0002 usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb1: Product: EHCI Host Controller usb usb1: Manufacturer: Linux 3.17.8-031708-generic ehci_hcd usb usb1: SerialNumber 0000:00:1d.0 hub 1-0:1.0: USB hub found hub 1-0:1.0: 8 ports detected usb 1-1: new high-speed USB device number 2 using ehci-pci usb 1-1: New USB device found, idVendor=8087, idProduct=07e6 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 hub 1-1:1.0: USB hub found hub 1-1:1.0: 4 ports detected (second unbind) ehci-pci 0000:00:1d.0: remove, state 4 usb usb1: USB disconnect, device number 1 usb 1-1: USB disconnect, device number 2 (freeze) I compiled a kernel 3.17(.0) with my additional debug lines... and this one does NOT freeze! The output is: (first unbind) ehci-pci 0000:00:1d.0: remove, state 4 ehci-pci 0000:00:1d.0: roothub graceful disconnect usb usb1: USB disconnect, device number 1 ehci-pci 0000:00:1d.0: shutdown urb ffff880072bf4300 ep1in-intr usb_remove_hcd: calling stop ehci-pci 0000:00:1d.0: stop ehci_silence_controller: entry ehci_halt: entry ehci_halt: after spin_lock_irq ehci_halt: about to readl prematurely ehci_halt: premature readl returned 10001 ehci_halt: after first ehci_writel ehci_halt: before ehci_readl ehci_halt: after ehci_readl, before ehci_writel ehci_halt: after second ehci_writel ehci_halt: after spin_unlock_irq ehci_halt: after_synchronize_irq, before ehci_handshake ehci_silence_controller: after ehci_silence_controller ehci-pci 0000:00:1d.0: reset command 0010002 (park)=0 ithresh=1 period=1024 Reset HALT ehci-pci 0000:00:1d.0: ehci_stop completed status 1000 Halt usb_remove_hcd: returned from stop usb_remove_hcd: after del_timer_sync ehci-pci 0000:00:1d.0: USB bus 1 deregistered (bind) ehci-pci 0000:00:1d.0: EHCI Host Controller ehci-pci 0000:00:1d.0: new USB bus registered, assigned bus number 1 ehci-pci 0000:00:1d.0: debug port 2 ehci-pci 0000:00:1d.0: cache line size of 64 is not supported ehci-pci 0000:00:1d.0: reset hcs_params 0x200008 dbg=2 cc=0 pcc=0 ordered !ppc ports=8 ehci-pci 0000:00:1d.0: reset hcc_params 36881 caching frame 1024 64 bit addr ehci_halt: entry ehci_halt: after spin_lock_irq ehci_halt: about to readl prematurely ehci_halt: premature readl returned 80000 ehci_halt: after first ehci_writel ehci_halt: before ehci_readl ehci_halt: after ehci_readl, before ehci_writel ehci_halt: after second ehci_writel ehci_halt: after spin_unlock_irq ehci_halt: after_synchronize_irq, before ehci_handshake ehci-pci 0000:00:1d.0: reset command 0010002 (park)=0 ithresh=1 period=1024 Reset HALT ehci-pci 0000:00:1d.0: cache line size of 64 is not supported ehci-pci 0000:00:1d.0: supports USB remote wakeup ehci-pci 0000:00:1d.0: irq 23, io mem 0x90918000 ehci-pci 0000:00:1d.0: init command 0010001 (park)=0 ithresh=1 period=1024 RUN ehci-pci 0000:00:1d.0: USB 2.0 started, EHCI 1.00 usb usb1: New USB device found, idVendor=1d6b, idProduct=0002 usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb1: Product: EHCI Host Controller usb usb1: Manufacturer: Linux 3.17.0-w ehci_hcd usb usb1: SerialNumber 0000:00:1d.0 hub 1-0:1.0: USB hub found hub 1-0:1.0: 8 ports detected ehci-pci 0000:00:1d.0: GetStatus port:1 status 001803 0 ACK POWER sig=j CSC CONNECT ehci-pci 0000:00:1d.0: port 1 reset complete, port enabled ehci-pci 0000:00:1d.0: GetStatus port:1 status 001005 0 ACK POWER sig=se0 PE CONNECT usb 1-1: new high-speed USB device number 2 using ehci-pci ehci-pci 0000:00:1d.0: port 1 reset complete, port enabled ehci-pci 0000:00:1d.0: GetStatus port:1 status 001005 0 ACK POWER sig=se0 PE CO N usb 1-1: New USB device found, idVendor=8087, idProduct=07e6 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 hub 1-1:1.0: USB hub found hub 1-1:1.0: 4 ports detected usb 1-1: ep 81: reserve intr @ 8+64 (1.0+256) [1/0 us] mask 0001 usb 1-1: link qh256-0001/ffff88007516dcc0 start 1 [1/0 us] (second unbind) ehci-pci 0000:00:1d.0: remove, state 1 ehci-pci 0000:00:1d.0: roothub graceful disconnect usb usb1: USB disconnect, device number 1 usb 1-1: USB disconnect, device number 2 usb 1-1: unlink qh256-0001/ffff88007516dcc0 start 1 [1/0 us] ehci-pci 0000:00:1d.0: shutdown urb ffff88007516dc00 ep1in-intr usb_remove_hcd: calling stop ehci-pci 0000:00:1d.0: stop ehci_silence_controller: entry ehci_halt: entry ehci_halt: after spin_lock_irq ehci_halt: about to readl prematurely ehci_halt: premature readl returned 10001 ehci_halt: after first ehci_writel ehci_halt: before ehci_readl ehci_halt: after ehci_readl, before ehci_writel ehci_halt: after second ehci_writel ehci_halt: after spin_unlock_irq ehci_halt: after_synchronize_irq, before ehci_handshake ehci_silence_controller: after ehci_silence_controller ehci_stop: after ehci_silence_controller ehci-pci 0000:00:1d.0: reset command 0010002 (park)=0 ithresh=1 period=1024 Reset HALT ehci-pci 0000:00:1d.0: ehci_stop completed status 1000 Halt usb_remove_hcd: returned from stop usb_remove_hcd: after del_timer_sync ehci-pci 0000:00:1d.0: USB bus 1 deregistered I cannot yet tell whether the difference between freeze and non-freeze is due to code changes, or because I used a different kernel config. (It brings down compilation times from 3h to 2h.) So next I'll compile 3.17.8 with my config. cheers and thanks, Roland -- 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
