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staging: usbip: vhci_hcd: fixed suspend-resume loop 

USB autosuspend suspends vhci_hcd. In this process hcd_bus_suspend gets
executed which puts vhci_hcd in suspend state and calls vhci_hub_status.
vhci_hub_status function checks hub state and if it is in suspend state,
usb_hcd_resume_root_hub gets executed which resumes hub and if hub is
idle, again autosuspend puts it in suspend state and this goes on.

vhci_hub_status should resume hub only when hub port is in suspend state
and hub port status has changed.

Signed-off-by: navin patidar <navinp@cdac.in>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
navin patidar 2012-09-06 16:49:50 +05:30 committed by Greg Kroah-Hartman
parent 236742de5b
commit 107f04bbce
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/usbip/vhci_hcd.c
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@ -220,7 +220,7 @@ static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
pr_info("changed %d\n", changed);
if (hcd->state == HC_STATE_SUSPENDED)
if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1))
usb_hcd_resume_root_hub(hcd);
done: