On Tue, Aug 28, 2012 at 11:10:45AM +0530, megha dey wrote: > In host mode,while continuously connecting and disconnecting a USB > device,sometimes enumeration does not happen(kernel 3.0.31).We see > that the hub_thread is blocked in the schedule() function.The > following is the function trace: > > [ 34.859924] task PC stack pid father > [ 34.865203] khubd D c05e9cb4 0 420 2 0x00000000 > [ 34.871704] [<c05e9cb4>] (__schedule+0x3d4/0x934) from [<c05ea388>] > (schedule+0x58/0x70) > [ 34.879882] [<c05ea388>] (schedule+0x58/0x70) from [<c034ab70>] > (rpm_resume+0x130/0x50c) > [ 34.888031] [<c034ab70>] (rpm_resume+0x130/0x50c) from [<c034acb4>] > (rpm_resume+0x274/0x50c) > [ 34.896545] [<c034acb4>] (rpm_resume+0x274/0x50c) from [<c034bc70>] > (__pm_runtime_resume+0x58/0x70) > [ 34.905670] [<c034bc70>] (__pm_runtime_resume+0x58/0x70) from > [<c03ae220>] (usb_autopm_get_interface+0x28/0x7c) > [ 34.915832] [<c03ae220>] (usb_autopm_get_interface+0x28/0x7c) from > [<c03a6428>] (hub_thread+0x118/0x15bc) > [ 34.925506] [<c03a6428>] (hub_thread+0x118/0x15bc) from > [<c00b7af0>] (kthread+0x94/0x9c) > [ 34.933685] [<c00b7af0>] (kthread+0x94/0x9c) from [<c005e208>] > (kernel_thread_exit+0x0/0x8) > > This happens in the case wherein there is a race condition between the > suspend (following the disconnect) and the resume (on > re-connection).Was a similar issue observed in this kernel? Are there > any patches available? > > Also,this issue is not seen on kernel3.4.However ,I require some > suggestions to resolve this issue on kernel3.0.31. Why not just use the 3.4 kernel instead? greg k-h -- 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
