diff options
| author | Johan Hovold <jhovold@gmail.com> | 2013-08-13 13:27:39 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-14 22:51:02 +0200 |
| commit | cbf30a914e89883457512f01c6434f70e6d57d4d (patch) | |
| tree | 5c8c15d42981e6b5f7583e78ca8586617abc024d /drivers/usb/serial/quatech2.c | |
| parent | USB: quatech2: fix serial DMA-buffer allocations (diff) | |
| download | linux-cbf30a914e89883457512f01c6434f70e6d57d4d.tar.xz linux-cbf30a914e89883457512f01c6434f70e6d57d4d.zip | |
USB: quatech2: fix port DMA-buffer allocations
Make sure serial DMA-buffers are allocated separately from containing
structure to prevent potential memory corruption on non-cache-coherent
systems.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/serial/quatech2.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c index 79c9b2be2edb..a24d59ae4032 100644 --- a/drivers/usb/serial/quatech2.c +++ b/drivers/usb/serial/quatech2.c @@ -122,7 +122,7 @@ struct qt2_port_private { spinlock_t urb_lock; bool urb_in_use; struct urb *write_urb; - char write_buffer[QT2_WRITE_BUFFER_SIZE]; + char *write_buffer; spinlock_t lock; u8 shadowLSR; @@ -755,21 +755,29 @@ static int qt2_port_probe(struct usb_serial_port *port) spin_lock_init(&port_priv->urb_lock); port_priv->port = port; + port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL); + if (!port_priv->write_buffer) + goto err_buf; + port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); - if (!port_priv->write_urb) { - kfree(port_priv); - return -ENOMEM; - } + if (!port_priv->write_urb) + goto err_urb; + bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; usb_fill_bulk_urb(port_priv->write_urb, serial->dev, usb_sndbulkpipe(serial->dev, bEndpointAddress), port_priv->write_buffer, - sizeof(port_priv->write_buffer), + QT2_WRITE_BUFFER_SIZE, qt2_write_bulk_callback, port); usb_set_serial_port_data(port, port_priv); return 0; +err_urb: + kfree(port_priv->write_buffer); +err_buf: + kfree(port_priv); + return -ENOMEM; } static int qt2_port_remove(struct usb_serial_port *port) @@ -778,6 +786,7 @@ static int qt2_port_remove(struct usb_serial_port *port) port_priv = usb_get_serial_port_data(port); usb_free_urb(port_priv->write_urb); + kfree(port_priv->write_buffer); kfree(port_priv); return 0; |