USB: make actual_length in struct urb field u32

actual_length should also be a u32 and not a signed value.  This patch
changes this field to be 'u32' to prevent any potential negative
conversion and comparison errors.

This triggered a few compiler warning messages when these fields were
being used with the min macro, so they have also been fixed up in this
patch.

Cc: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index adeb23f..dcc87aa 100644 (file)
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1947,7 +1947,7 @@ static void ftdi_process_read(struct work_struct *work)
                        priv->prev_status = new_status;
                }
 
-               length = min(PKTSZ, urb->actual_length-packet_offset)-2;
+               length = min_t(u32, PKTSZ, urb->actual_length-packet_offset)-2;
                if (length < 0) {
                        dev_err(&port->dev, "%s - bad packet length: %d\n",
                                __func__, length+2);

diff --git a/include/linux/usb.h b/include/linux/usb.h
index db8808e..c6b2ab4 100644 (file)
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -1178,7 +1178,7 @@ struct urb {
        void *transfer_buffer;          /* (in) associated data buffer */
        dma_addr_t transfer_dma;        /* (in) dma addr for transfer_buffer */
        u32 transfer_buffer_length;     /* (in) data buffer length */
-       int actual_length;              /* (return) actual transfer length */
+       u32 actual_length;              /* (return) actual transfer length */
        unsigned char *setup_packet;    /* (in) setup packet (control only) */
        dma_addr_t setup_dma;           /* (in) dma addr for setup_packet */
        int start_frame;                /* (modify) start frame (ISO) */