Commit f283925f authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman

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: default avatarAlan Stern <stern@rowland.harvard.edu>
Cc: James Bottomley <James.Bottomley@suse.de>
Cc: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 185c9bcf
...@@ -336,6 +336,7 @@ static int usb_stor_control_thread(void * __us) ...@@ -336,6 +336,7 @@ static int usb_stor_control_thread(void * __us)
else { else {
US_DEBUG(usb_stor_show_command(us->srb)); US_DEBUG(usb_stor_show_command(us->srb));
us->proto_handler(us->srb, us); us->proto_handler(us->srb, us);
usb_mark_last_busy(us->pusb_dev);
} }
/* lock access to the state */ /* lock access to the state */
...@@ -845,6 +846,7 @@ static int usb_stor_scan_thread(void * __us) ...@@ -845,6 +846,7 @@ static int usb_stor_scan_thread(void * __us)
/* Should we unbind if no devices were detected? */ /* Should we unbind if no devices were detected? */
} }
usb_autopm_put_interface(us->pusb_intf);
complete_and_exit(&us->scanning_done, 0); complete_and_exit(&us->scanning_done, 0);
} }
...@@ -968,6 +970,7 @@ int usb_stor_probe2(struct us_data *us) ...@@ -968,6 +970,7 @@ int usb_stor_probe2(struct us_data *us)
goto BadDevice; goto BadDevice;
} }
usb_autopm_get_interface_no_resume(us->pusb_intf);
wake_up_process(th); wake_up_process(th);
return 0; return 0;
...@@ -1040,6 +1043,7 @@ static struct usb_driver usb_storage_driver = { ...@@ -1040,6 +1043,7 @@ static struct usb_driver usb_storage_driver = {
.pre_reset = usb_stor_pre_reset, .pre_reset = usb_stor_pre_reset,
.post_reset = usb_stor_post_reset, .post_reset = usb_stor_post_reset,
.id_table = usb_storage_usb_ids, .id_table = usb_storage_usb_ids,
.supports_autosuspend = 1,
.soft_unbind = 1, .soft_unbind = 1,
}; };
......
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