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@xxxxxxxxxxxxxxxxxxx>
---
Now that the SCSI runtime-PM patches have been accepted for the
upcoming merge window, it's time to make use of the new mechanism in
usb-storage. That's what this does.
Because this patch depends on those SCSI changes, either it should also
go via James's tree or else the SCSI patches should be imported into
Greg's tree first. James and Greg, which route is easier for you?
Alan Stern
Index: usb-2.6/drivers/usb/storage/usb.c
===================================================================
--- usb-2.6.orig/drivers/usb/storage/usb.c
+++ usb-2.6/drivers/usb/storage/usb.c
@@ -336,6 +336,7 @@ static int usb_stor_control_thread(void
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 * _
/* 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_dri
.pre_reset = usb_stor_pre_reset,
.post_reset = usb_stor_post_reset,
.id_table = usb_storage_usb_ids,
+ .supports_autosuspend = 1,
.soft_unbind = 1,
};
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
