From 0458d5b4c9cc4ca0f62625d0144ddc4b4bc97a3c Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Fri, 4 May 2007 11:52:20 -0400 Subject: USB: add USB-Persist facility This patch (as886) adds the controversial USB-persist facility, allowing USB devices to persist across a power loss during system suspend. The facility is controlled by a new Kconfig option (with appropriate warnings about the potential dangers); when the option is off the behavior will remain the same as it is now. But when the option is on, people will be able to use suspend-to-disk and keep their USB filesystems intact -- something particularly valuable for small machines where the root filesystem is on a USB device! Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/storage/usb.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'drivers/usb/storage') diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c index df5dc186aef5..be4cd8fe4ce6 100644 --- a/drivers/usb/storage/usb.c +++ b/drivers/usb/storage/usb.c @@ -236,7 +236,7 @@ static void storage_pre_reset(struct usb_interface *iface) mutex_lock(&us->dev_mutex); } -static void storage_post_reset(struct usb_interface *iface) +static void storage_post_reset(struct usb_interface *iface, int reset_resume) { struct us_data *us = usb_get_intfdata(iface); @@ -249,7 +249,11 @@ static void storage_post_reset(struct usb_interface *iface) /* FIXME: Notify the subdrivers that they need to reinitialize * the device */ - mutex_unlock(&us->dev_mutex); + + /* If this is a reset-resume then the pre_reset routine wasn't + * called, so we don't need to unlock the mutex. */ + if (!reset_resume) + mutex_unlock(&us->dev_mutex); } /* -- cgit v1.2.3