From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: Wed, 20 Feb 2008 20:49:53 +0000 (+0000)
Subject: USB: ftdi_sio: Note missing locking
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9b0f2582d57d4c9081307c86e11afc9169de7d3e;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

USB: ftdi_sio: Note missing locking

The ftdi_sio driver has no internal locking on the dtr/rts state. Flag
that up for someone to fix.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 3abb3c863647..4643212eb959 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -533,9 +533,8 @@ static int update_mctrl(struct usb_serial_port *port, unsigned int set, unsigned
 	}
 
 	buf = kmalloc(1, GFP_NOIO);
-	if (!buf) {
+	if (!buf)
 		return -ENOMEM;
-	}
 
 	clear &= ~set;	/* 'set' takes precedence over 'clear' */
 	urb_value = 0;
@@ -568,6 +567,7 @@ static int update_mctrl(struct usb_serial_port *port, unsigned int set, unsigned
 				(clear & TIOCM_DTR) ? "LOW" : "unchanged",
 				(set & TIOCM_RTS) ? "HIGH" :
 				(clear & TIOCM_RTS) ? "LOW" : "unchanged");
+		/* FIXME: locking on last_dtr_rts */
 		priv->last_dtr_rts = (priv->last_dtr_rts & ~clear) | set;
 	}
 	return rv;