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USB: usb-storage: implement autosuspend 

This patch (as1400) adds runtime-PM support to usb-storage.  It
utilizes the SCSI layer's runtime-PM implementation, so its scope is
limited.  Currently the only effect is that disk-like devices (such as
card readers or flash drives) will be autosuspended if they aren't
mounted and their device files aren't open.  This would apply, for
example, to card readers that don't contain a memory card.

Unfortunately this won't interact very well with the removable-media
polling normally carried out by hal or DeviceKit.  Maybe those
programs can be changed to use a longer polling interval, or maybe the
default autosuspend time for usb-storage should be set to something
below 1 second.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: James Bottomley <James.Bottomley@suse.de>
Cc: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2010-07-28 17:12:39 -04:00 committed by Greg Kroah-Hartman
parent 185c9bcfde
commit f283925fe9
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/storage/usb.c
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@ -336,6 +336,7 @@ static int usb_stor_control_thread(void * __us)
else {
US_DEBUG(usb_stor_show_command(us->srb));
us->proto_handler(us->srb, us);
usb_mark_last_busy(us->pusb_dev);
}
/* lock access to the state */
@ -845,6 +846,7 @@ static int usb_stor_scan_thread(void * __us)
/* Should we unbind if no devices were detected? */
}
usb_autopm_put_interface(us->pusb_intf);
complete_and_exit(&us->scanning_done, 0);
}
@ -968,6 +970,7 @@ int usb_stor_probe2(struct us_data *us)
goto BadDevice;
}
usb_autopm_get_interface_no_resume(us->pusb_intf);
wake_up_process(th);
return 0;
@ -1040,6 +1043,7 @@ static struct usb_driver usb_storage_driver = {
.pre_reset = usb_stor_pre_reset,
.post_reset = usb_stor_post_reset,
.id_table = usb_storage_usb_ids,
.supports_autosuspend = 1,
.soft_unbind = 1,
};