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USB: add USB-Persist facility

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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 <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2007-05-04 11:52:20 -04:00
committed by Greg Kroah-Hartman
parent ce7cd137fc
commit 0458d5b4c9
10 changed files with 353 additions and 79 deletions
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8
drivers/usb/storage/usb.c
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@@ -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);
}
/*