USB: make transfer_buffer_lengths in struct urb field u32

Roel Kluin pointed out that transfer_buffer_lengths in struct urb was
declared as an 'int'.  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>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 0c05ff621192..db8808e05a2a 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -1177,7 +1177,7 @@ struct urb {
         unsigned int transfer_flags;    /* (in) URB_SHORT_NOT_OK | ...*/
         void *transfer_buffer;          /* (in) associated data buffer */
         dma_addr_t transfer_dma;        /* (in) dma addr for transfer_buffer */
-        int transfer_buffer_length;     /* (in) data buffer length */
+        u32 transfer_buffer_length;     /* (in) data buffer length */
         int 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 */