This is a note to let you know that I've just added the patch titled
USB: opticon: fix DMA from stack
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From ea0dbebffe118724cd4df7d9b071ea8ee48d48f0 Mon Sep 17 00:00:00 2001
From: Johan Hovold <[email protected]>
Date: Thu, 25 Oct 2012 10:29:11 +0200
Subject: USB: opticon: fix DMA from stack
Make sure to allocate the control-message buffer dynamically as some
platforms cannot do DMA from stack.
Note that only the first byte of the old buffer was used.
Cc: <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/serial/opticon.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index 41b1647..459c288 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -155,7 +155,11 @@ static int send_control_msg(struct usb_serial_port *port,
u8 requesttype,
{
struct usb_serial *serial = port->serial;
int retval;
- u8 buffer[2];
+ u8 *buffer;
+
+ buffer = kzalloc(1, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
buffer[0] = val;
/* Send the message to the vendor control endpoint
@@ -164,6 +168,7 @@ static int send_control_msg(struct usb_serial_port *port,
u8 requesttype,
requesttype,
USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
0, 0, buffer, 1, 0);
+ kfree(buffer);
return retval;
}
--
1.7.12.2.421.g261b511
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