From feb0fb39695b9f627c3f15a39fea8ee090e2f8fc Mon Sep 17 00:00:00 2001 From: Evan Green Date: Thu, 21 Apr 2022 10:39:27 -0700 Subject: [PATCH] USB: hcd-pci: Fully suspend across freeze/thaw cycle [ 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 Signed-off-by: Evan Green Link: https://lore.kernel.org/r/20220421103751.v3.2.I8226c7fdae88329ef70957b96a39b346c69a914e@changeid Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- 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 d630cccd2e6ea..5af810cd8a58f 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,