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authorYinbo Zhu <zhuyinbo@loongson.cn>2022-09-02 14:36:39 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-09-05 13:08:00 +0200
commitf3d478858bec4f5dbba410f9b1db1b2505344188 (patch)
tree30a0b84f4a134f49a423d17e6e66306cc7dd575a /fs/befs/super.c
parenta956f91247da3fe71e4d5f7da1f6dd8bae7c3c21 (diff)
downloadlinux-f3d478858bec4f5dbba410f9b1db1b2505344188.tar.bz2
usb: ohci-platform: fix usb disconnect issue after s4
The ohci retaining bogus hardware states cause usb disconnect devices connected before hibernation(s4), this issue occur when ohci-platform driver build as a module and the built-in ohci-platform driver will re probe and re enumerate the devices, so there will be no such problem. Avoid retaining bogus hardware states during resume-from-hibernation. Previously we had reset the hardware as part of preparing to reinstate the snapshot image. But we can do better now with the new PM framework, since we know exactly which resume operations are from hibernation. According to the commit 'cd1965db054e ("USB: ohci: move ohci_pci_{ suspend,resume} to ohci-hcd.c")' and commit '6ec4beb5c701 ("USB: new flag for resume-from-hibernation")', the flag "hibernated" is for resume-from-hibernation and it should be true when usb resume from disk. When this flag "hibernated" is set, the drivers will reset the hardware to get rid of any existing state and make sure resume from hibernation re-enumerates everything for ohci. Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn> Link: https://lore.kernel.org/r/20220902063639.17875-1-zhuyinbo@loongson.cn Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/befs/super.c')
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