提交 f283925f 编写于 作者: A Alan Stern 提交者: 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: NAlan Stern <stern@rowland.harvard.edu>
Cc: James Bottomley <James.Bottomley@suse.de>
Cc: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
上级 185c9bcf
......@@ -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,
};
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册