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>

6 files changed, 9 insertions, 9 deletions

diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
index 3b42888b72f8..a56b24d305f8 100644
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -1437,7 +1437,7 @@ restart:
                                         }
                                         if (urb->transfer_buffer_length > 1)
                                                 buf [1] = 0;
-                                        urb->actual_length = min (2,
+                                        urb->actual_length = min_t(u32, 2,
                                                 urb->transfer_buffer_length);
                                         value = 0;
                                         status = 0;
diff --git a/drivers/usb/host/isp116x-hcd.c b/drivers/usb/host/isp116x-hcd.c
index 4dda31b26892..a2b305477afe 100644
--- a/drivers/usb/host/isp116x-hcd.c
+++ b/drivers/usb/host/isp116x-hcd.c
@@ -772,7 +772,7 @@ static int isp116x_urb_enqueue(struct usb_hcd *hcd,
                 break;
         case PIPE_INTERRUPT:
                 urb->interval = ep->period;
-                ep->length = min((int)ep->maxpacket,
+                ep->length = min_t(u32, ep->maxpacket,
                                  urb->transfer_buffer_length);
 
                 /* urb submitted for already existing endpoint */
diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index 5e942d94aebe..713f4cf0b0dd 100644
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -1394,7 +1394,7 @@ static void packet_write(struct r8a66597 *r8a66597, u16 pipenum)
                            (int)urb->iso_frame_desc[td->iso_cnt].length);
         } else {
                 buf = (u16 *)(urb->transfer_buffer + urb->actual_length);
-                size = min((int)bufsize,
+                size = min_t(u32, bufsize,
                            urb->transfer_buffer_length - urb->actual_length);
         }
 
diff --git a/drivers/usb/host/sl811-hcd.c b/drivers/usb/host/sl811-hcd.c
index e106e9d48d4a..a949259f18b9 100644
--- a/drivers/usb/host/sl811-hcd.c
+++ b/drivers/usb/host/sl811-hcd.c
@@ -230,7 +230,7 @@ static void in_packet(
         writeb(usb_pipedevice(urb->pipe), data_reg);
 
         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
-        ep->length = min((int)len,
+        ep->length = min_t(u32, len,
                         urb->transfer_buffer_length - urb->actual_length);
         PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
                         !!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len);
@@ -255,7 +255,7 @@ static void out_packet(
         buf = urb->transfer_buffer + urb->actual_length;
         prefetch(buf);
 
-        len = min((int)ep->maxpacket,
+        len = min_t(u32, ep->maxpacket,
                         urb->transfer_buffer_length - urb->actual_length);
 
         if (!(control & SL11H_HCTLMASK_ISOCH)
diff --git a/drivers/usb/misc/ftdi-elan.c b/drivers/usb/misc/ftdi-elan.c
index 79a7668ef264..9d0675ed0d4c 100644
--- a/drivers/usb/misc/ftdi-elan.c
+++ b/drivers/usb/misc/ftdi-elan.c
@@ -1568,7 +1568,7 @@ static int ftdi_elan_edset_input(struct usb_ftdi *ftdi, u8 ed_number,
                         struct u132_target *target = &ftdi->target[ed];
                         struct u132_command *command = &ftdi->command[
                                 COMMAND_MASK & ftdi->command_next];
-                        int remaining_length = urb->transfer_buffer_length -
+                        u32 remaining_length = urb->transfer_buffer_length -
                                 urb->actual_length;
                         command->header = 0x82 | (ed << 5);
                         if (remaining_length == 0) {
@@ -1702,7 +1702,7 @@ static int ftdi_elan_edset_output(struct usb_ftdi *ftdi, u8 ed_number,
                                 | (address << 0);
                         command->width = usb_maxpacket(urb->dev, urb->pipe,
                                 usb_pipeout(urb->pipe));
-                        command->follows = min(1024,
+                        command->follows = min_t(u32, 1024,
                                 urb->transfer_buffer_length -
                                 urb->actual_length);
                         command->value = 0;
@@ -1766,7 +1766,7 @@ static int ftdi_elan_edset_single(struct usb_ftdi *ftdi, u8 ed_number,
                 mutex_lock(&ftdi->u132_lock);
                 command_size = ftdi->command_next - ftdi->command_head;
                 if (command_size < COMMAND_SIZE) {
-                        int remaining_length = urb->transfer_buffer_length -
+                        u32 remaining_length = urb->transfer_buffer_length -
                                 urb->actual_length;
                         struct u132_target *target = &ftdi->target[ed];
                         struct u132_command *command = &ftdi->command[
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 */