From af0de1303c4e8f44fadd7b4c593f09f22324b04f Mon Sep 17 00:00:00 2001 From: Oliver Neukum Date: Thu, 17 Oct 2019 15:25:47 +0200 Subject: usb: hso: obey DMA rules in tiocmget The serial state information must not be embedded into another data structure, as this interferes with cache handling for DMA on architectures without cache coherence.. That would result in data corruption on some architectures Allocating it separately. v2: fix syntax error Signed-off-by: Oliver Neukum Signed-off-by: David S. Miller --- drivers/net/usb/hso.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) (limited to 'drivers/net/usb/hso.c') diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c index a505b2ab88b8..74849da031fa 100644 --- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -186,7 +186,7 @@ struct hso_tiocmget { int intr_completed; struct usb_endpoint_descriptor *endp; struct urb *urb; - struct hso_serial_state_notification serial_state_notification; + struct hso_serial_state_notification *serial_state_notification; u16 prev_UART_state_bitmap; struct uart_icount icount; }; @@ -1432,7 +1432,7 @@ static int tiocmget_submit_urb(struct hso_serial *serial, usb_rcvintpipe(usb, tiocmget->endp-> bEndpointAddress & 0x7F), - &tiocmget->serial_state_notification, + tiocmget->serial_state_notification, sizeof(struct hso_serial_state_notification), tiocmget_intr_callback, serial, tiocmget->endp->bInterval); @@ -1479,7 +1479,7 @@ static void tiocmget_intr_callback(struct urb *urb) /* wIndex should be the USB interface number of the port to which the * notification applies, which should always be the Modem port. */ - serial_state_notification = &tiocmget->serial_state_notification; + serial_state_notification = tiocmget->serial_state_notification; if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE || serial_state_notification->bNotification != B_NOTIFICATION || le16_to_cpu(serial_state_notification->wValue) != W_VALUE || @@ -2565,6 +2565,8 @@ static void hso_free_tiomget(struct hso_serial *serial) usb_free_urb(tiocmget->urb); tiocmget->urb = NULL; serial->tiocmget = NULL; + kfree(tiocmget->serial_state_notification); + tiocmget->serial_state_notification = NULL; kfree(tiocmget); } } @@ -2615,10 +2617,13 @@ static struct hso_device *hso_create_bulk_serial_device( num_urbs = 2; serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget), GFP_KERNEL); + serial->tiocmget->serial_state_notification + = kzalloc(sizeof(struct hso_serial_state_notification), + GFP_KERNEL); /* it isn't going to break our heart if serial->tiocmget * allocation fails don't bother checking this. */ - if (serial->tiocmget) { + if (serial->tiocmget && serial->tiocmget->serial_state_notification) { tiocmget = serial->tiocmget; tiocmget->endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT, -- cgit v1.2.3-59-g8ed1b