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| author | Bob Copeland <me@bobcopeland.com> | 2009-04-28 07:49:53 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2009-04-28 09:34:13 -0700 |
| commit | 0385c5ee3ca96bfe244610bf459abf66682ff202 (patch) | |
| tree | 501c065abff9f3c262152de507cfc76a8e07258e /drivers/input/mouse/appletouch.c | |
| parent | 384318ecd2eb4fdbcbe7c4df6e8bb55986bf52d4 (diff) | |
| download | lwn-0385c5ee3ca96bfe244610bf459abf66682ff202.tar.gz lwn-0385c5ee3ca96bfe244610bf459abf66682ff202.zip | |
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.c | 24 |
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; } /* |