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authorBob Copeland <me@bobcopeland.com>2009-04-28 07:49:53 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-04-28 09:34:13 -0700
commit0385c5ee3ca96bfe244610bf459abf66682ff202 (patch)
tree501c065abff9f3c262152de507cfc76a8e07258e /drivers/input/mouse/appletouch.c
parent384318ecd2eb4fdbcbe7c4df6e8bb55986bf52d4 (diff)
Input: appletouch - fix DMA to/from stack buffer
CONFIG_DMA_API_DEBUG spotted an instance of appletouch using an array on the stack as a DMA buffer for certain hardware. Change it to use a kmalloc()ed buffer instead. Signed-off-by: Bob Copeland <me@bobcopeland.com> Reviewed-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/mouse/appletouch.c')
-rw-r--r--drivers/input/mouse/appletouch.c24
1 files changed, 18 insertions, 6 deletions
diff --git a/drivers/input/mouse/appletouch.c b/drivers/input/mouse/appletouch.c
index 454b96112f03..e0140fdc02a5 100644
--- a/drivers/input/mouse/appletouch.c
+++ b/drivers/input/mouse/appletouch.c
@@ -255,15 +255,22 @@ MODULE_PARM_DESC(debug, "Activate debugging output");
*/
static int atp_geyser_init(struct usb_device *udev)
{
- char data[8];
+ char *data;
int size;
int i;
+ int ret;
+
+ data = kmalloc(8, GFP_KERNEL);
+ if (!data) {
+ err("Out of memory");
+ return -ENOMEM;
+ }
size = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
ATP_GEYSER_MODE_READ_REQUEST_ID,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
ATP_GEYSER_MODE_REQUEST_VALUE,
- ATP_GEYSER_MODE_REQUEST_INDEX, &data, 8, 5000);
+ ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000);
if (size != 8) {
dprintk("atp_geyser_init: read error\n");
@@ -271,7 +278,8 @@ static int atp_geyser_init(struct usb_device *udev)
dprintk("appletouch[%d]: %d\n", i, data[i]);
err("Failed to read mode from device.");
- return -EIO;
+ ret = -EIO;
+ goto out_free;
}
/* Apply the mode switch */
@@ -281,7 +289,7 @@ static int atp_geyser_init(struct usb_device *udev)
ATP_GEYSER_MODE_WRITE_REQUEST_ID,
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
ATP_GEYSER_MODE_REQUEST_VALUE,
- ATP_GEYSER_MODE_REQUEST_INDEX, &data, 8, 5000);
+ ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000);
if (size != 8) {
dprintk("atp_geyser_init: write error\n");
@@ -289,9 +297,13 @@ static int atp_geyser_init(struct usb_device *udev)
dprintk("appletouch[%d]: %d\n", i, data[i]);
err("Failed to request geyser raw mode");
- return -EIO;
+ ret = -EIO;
+ goto out_free;
}
- return 0;
+ ret = 0;
+out_free:
+ kfree(data);
+ return ret;
}
/*