lkml.org 
[lkml]   [2022]   [Jun]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH AUTOSEL 5.15 15/51] USB: hcd-pci: Fully suspend across freeze/thaw cycle
    Date
    From: Evan Green <evgreen@chromium.org>

    [ Upstream commit 63acaa8e9c65dc34dc249440216f8e977f5d2748 ]

    The documentation for the freeze() method says that it "should quiesce
    the device so that it doesn't generate IRQs or DMA". The unspoken
    consequence of not doing this is that MSIs aimed at non-boot CPUs may
    get fully lost if they're sent during the period where the target CPU is
    offline.

    The current callbacks for USB HCD do not fully quiesce interrupts,
    specifically on XHCI. Change to use the full suspend/resume flow for
    freeze/thaw to ensure interrupts are fully quiesced. This fixes issues
    where USB devices fail to thaw during hibernation because XHCI misses
    its interrupt and cannot recover.

    Acked-by: Alan Stern <stern@rowland.harvard.edu>
    Signed-off-by: Evan Green <evgreen@chromium.org>
    Link: https://lore.kernel.org/r/20220421103751.v3.2.I8226c7fdae88329ef70957b96a39b346c69a914e@changeid
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/usb/core/hcd-pci.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
    index d630cccd2e6e..5af810cd8a58 100644
    --- a/drivers/usb/core/hcd-pci.c
    +++ b/drivers/usb/core/hcd-pci.c
    @@ -616,10 +616,10 @@ const struct dev_pm_ops usb_hcd_pci_pm_ops = {
    .suspend_noirq = hcd_pci_suspend_noirq,
    .resume_noirq = hcd_pci_resume_noirq,
    .resume = hcd_pci_resume,
    - .freeze = check_root_hub_suspended,
    + .freeze = hcd_pci_suspend,
    .freeze_noirq = check_root_hub_suspended,
    .thaw_noirq = NULL,
    - .thaw = NULL,
    + .thaw = hcd_pci_resume,
    .poweroff = hcd_pci_suspend,
    .poweroff_noirq = hcd_pci_suspend_noirq,
    .restore_noirq = hcd_pci_resume_noirq,
    --
    2.35.1
    \
     
     \ /
      Last update: 2022-06-07 21:29    [W:4.086 / U:0.180 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site