iowarrior: use normal memory in write path

There is just no point in using coherent memory.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Link: https://patch.msgid.link/20260312095328.1594015-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index 0b377204374f4fadda94aba0e45f43ca38b7ed66..54f1bb0f71234098d188cf07d45fe5df40247751 100644 (file)
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -233,8 +233,7 @@ static void iowarrior_write_callback(struct urb *urb)
                        "nonzero write bulk status received: %d\n", status);
        }
        /* free up our allocated buffer */
-       usb_free_coherent(urb->dev, urb->transfer_buffer_length,
-                         urb->transfer_buffer, urb->transfer_dma);
+       kfree(urb->transfer_buffer);
        /* tell a waiting writer the interrupt-out-pipe is available again */
        atomic_dec(&dev->write_busy);
        wake_up_interruptible(&dev->write_wait);
@@ -439,8 +438,7 @@ static ssize_t iowarrior_write(struct file *file,
                        retval = -ENOMEM;
                        goto error_no_urb;
                }
-               buf = usb_alloc_coherent(dev->udev, dev->report_size,
-                                        GFP_KERNEL, &int_out_urb->transfer_dma);
+               buf = kmalloc(dev->report_size, GFP_KERNEL);
                if (!buf) {
                        retval = -ENOMEM;
                        dev_dbg(&dev->interface->dev,
@@ -453,7 +451,6 @@ static ssize_t iowarrior_write(struct file *file,
                                 buf, dev->report_size,
                                 iowarrior_write_callback, dev,
                                 dev->int_out_endpoint->bInterval);
-               int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
                if (copy_from_user(buf, user_buffer, count)) {
                        retval = -EFAULT;
                        goto error;
@@ -479,8 +476,7 @@ static ssize_t iowarrior_write(struct file *file,
                goto exit;
        }
 error:
-       usb_free_coherent(dev->udev, dev->report_size, buf,
-                         int_out_urb->transfer_dma);
+       kfree(buf);
 error_no_buffer:
        usb_free_urb(int_out_urb);
 error_no_urb: