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    Subject[PATCH 5.7 226/477] usb/ohci-platform: Fix a warning when hibernating
    Date
    From: Qais Yousef <qais.yousef@arm.com>

    [ Upstream commit 1cb3b0095c3d0bb96912bfbbce4fc006d41f367c ]

    The following warning was observed when attempting to suspend to disk
    using a USB flash as a swap device.

    [ 111.779649] ------------[ cut here ]------------
    [ 111.788382] URB (____ptrval____) submitted while active
    [ 111.796646] WARNING: CPU: 3 PID: 365 at drivers/usb/core/urb.c:363 usb_submit_urb+0x3d8/0x590
    [ 111.805417] Modules linked in:
    [ 111.808584] CPU: 3 PID: 365 Comm: kworker/3:2 Not tainted 5.6.0-rc6-00002-gdfd1731f9a3e-dirty #545
    [ 111.817796] Hardware name: ARM Juno development board (r2) (DT)
    [ 111.823896] Workqueue: usb_hub_wq hub_event
    [ 111.828217] pstate: 60000005 (nZCv daif -PAN -UAO)
    [ 111.833156] pc : usb_submit_urb+0x3d8/0x590
    [ 111.837471] lr : usb_submit_urb+0x3d8/0x590
    [ 111.841783] sp : ffff800018de38b0
    [ 111.845205] x29: ffff800018de38b0 x28: 0000000000000003
    [ 111.850682] x27: ffff000970530b20 x26: ffff8000133fd000
    [ 111.856159] x25: ffff8000133fd000 x24: ffff800018de3b38
    [ 111.861635] x23: 0000000000000004 x22: 0000000000000c00
    [ 111.867112] x21: 0000000000000000 x20: 00000000fffffff0
    [ 111.872589] x19: ffff0009704e7a00 x18: ffffffffffffffff
    [ 111.878065] x17: 00000000a7c8f4bc x16: 000000002af33de8
    [ 111.883542] x15: ffff8000133fda88 x14: 0720072007200720
    [ 111.889019] x13: 0720072007200720 x12: 0720072007200720
    [ 111.894496] x11: 0000000000000000 x10: 00000000a5286134
    [ 111.899973] x9 : 0000000000000002 x8 : ffff000970c837a0
    [ 111.905449] x7 : 0000000000000000 x6 : ffff800018de3570
    [ 111.910926] x5 : 0000000000000001 x4 : 0000000000000003
    [ 111.916401] x3 : 0000000000000000 x2 : ffff800013427118
    [ 111.921879] x1 : 9d4e965b4b7d7c00 x0 : 0000000000000000
    [ 111.927356] Call trace:
    [ 111.929892] usb_submit_urb+0x3d8/0x590
    [ 111.933852] hub_activate+0x108/0x7f0
    [ 111.937633] hub_resume+0xac/0x148
    [ 111.941149] usb_resume_interface.isra.10+0x60/0x138
    [ 111.946265] usb_resume_both+0xe4/0x140
    [ 111.950225] usb_runtime_resume+0x24/0x30
    [ 111.954365] __rpm_callback+0xdc/0x138
    [ 111.958236] rpm_callback+0x34/0x98
    [ 111.961841] rpm_resume+0x4a8/0x720
    [ 111.965445] rpm_resume+0x50c/0x720
    [ 111.969049] __pm_runtime_resume+0x4c/0xb8
    [ 111.973276] usb_autopm_get_interface+0x28/0x60
    [ 111.977948] hub_event+0x80/0x16d8
    [ 111.981466] process_one_work+0x2a4/0x748
    [ 111.985604] worker_thread+0x48/0x498
    [ 111.989387] kthread+0x13c/0x140
    [ 111.992725] ret_from_fork+0x10/0x18
    [ 111.996415] irq event stamp: 354
    [ 111.999756] hardirqs last enabled at (353): [<ffff80001019ea1c>] console_unlock+0x504/0x5b8
    [ 112.008441] hardirqs last disabled at (354): [<ffff8000100a95d0>] do_debug_exception+0x1a8/0x258
    [ 112.017479] softirqs last enabled at (350): [<ffff8000100818a4>] __do_softirq+0x4bc/0x568
    [ 112.025984] softirqs last disabled at (343): [<ffff8000101145a4>] irq_exit+0x144/0x150
    [ 112.034129] ---[ end trace dc96030b9cf6c8a3 ]---

    The problem was tracked down to a missing call to
    pm_runtime_set_active() on resume in ohci-platform.

    Link: https://lore.kernel.org/lkml/20200323143857.db5zphxhq4hz3hmd@e107158-lin.cambridge.arm.com/
    Acked-by: Alan Stern <stern@rowland.harvard.edu>
    Signed-off-by: Qais Yousef <qais.yousef@arm.com>
    CC: Tony Prisk <linux@prisktech.co.nz>
    CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    CC: Mathias Nyman <mathias.nyman@intel.com>
    CC: Oliver Neukum <oneukum@suse.de>
    CC: linux-arm-kernel@lists.infradead.org
    CC: linux-usb@vger.kernel.org
    CC: linux-kernel@vger.kernel.org
    Link: https://lore.kernel.org/r/20200518154931.6144-1-qais.yousef@arm.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/usb/host/ohci-platform.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
    index 7addfc2cbadce..4a8456f12a73d 100644
    --- a/drivers/usb/host/ohci-platform.c
    +++ b/drivers/usb/host/ohci-platform.c
    @@ -299,6 +299,11 @@ static int ohci_platform_resume(struct device *dev)
    }

    ohci_resume(hcd, false);
    +
    + pm_runtime_disable(dev);
    + pm_runtime_set_active(dev);
    + pm_runtime_enable(dev);
    +
    return 0;
    }
    #endif /* CONFIG_PM_SLEEP */
    --
    2.25.1


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