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Commit 4c1f5c88 authored by Harrison Metzger's avatar Harrison Metzger Committed by Greg Kroah-Hartman
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USB: fixed bug in usbsevseg using USB autosuspend incorrectly 



This patch fixes a bug with the usbsevseg driver which assumed that USB
autosuspend will always be used.

Signed-off-by: default avatarHarrison Metzger <harrisonmetz@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent cdc04834

drivers/usb/misc/usbsevseg.c

+13 −2
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ struct usb_sevsegdev { 
	u16 textlength;



	u8 shadow_power; /* for PM */

	u8 has_interface_pm;

};



/* sysfs_streq can't replace this completely
@@ -68,12 +69,16 @@ static void update_display_powered(struct usb_sevsegdev *mydev) 
{

	int rc;



	if (!mydev->shadow_power && mydev->powered) {

	if (mydev->powered && !mydev->has_interface_pm) {

		rc = usb_autopm_get_interface(mydev->intf);

		if (rc < 0)

			return;

		mydev->has_interface_pm = 1;

	}



	if (mydev->shadow_power != 1)

		return;



	rc = usb_control_msg(mydev->udev,

			usb_sndctrlpipe(mydev->udev, 0),

			0x12,
@@ -86,8 +91,10 @@ static void update_display_powered(struct usb_sevsegdev *mydev) 
	if (rc < 0)

		dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);



	if (mydev->shadow_power && !mydev->powered)

	if (!mydev->powered && mydev->has_interface_pm) {

		usb_autopm_put_interface(mydev->intf);

		mydev->has_interface_pm = 0;

	}

}



static void update_display_mode(struct usb_sevsegdev *mydev)
@@ -351,6 +358,10 @@ static int sevseg_probe(struct usb_interface *interface, 
	mydev->intf = interface;

	usb_set_intfdata(interface, mydev);



	/* PM */

	mydev->shadow_power = 1; /* currently active */

	mydev->has_interface_pm = 0; /* have not issued autopm_get */



	/*set defaults */

	mydev->textmode = 0x02; /* ascii mode */

	mydev->mode_msb = 0x06; /* 6 characters */