usb: gadget: mass_storage: remove >= 0 check for unsigned type

| In file included from drivers/usb/gadget/acm_ms.c:43:
| f_mass_storage.c:2199:18: warning: comparison of unsigned expression >= 0 is always true  [-Wtautological-compare]
|         if (common->lun >= 0 && common->lun < common->nluns)
|             ~~~~~~~~~~~ ^  ~

common->lun is defined as "unsigned int" so its value is always >= 0.
It is assigned via cbw->Lun which is defined as u8 so it is also not
abused as -1.

[ mina86@mina86.com : make lun unsigned int and use %u in DBG() macro for it ]

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index 4ce732852ae8..fc5c16ca5e0a 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -1691,7 +1691,7 @@ static int check_command(struct fsg_common *common, int cmnd_size,
                          int needs_medium, const char *name)
 {
         int                     i;
-        int                     lun = common->cmnd[1] >> 5;
+        unsigned int            lun = common->cmnd[1] >> 5;
         static const char       dirletter[4] = {'u', 'o', 'i', 'n'};
         char                    hdlen[20];
         struct fsg_lun          *curlun;
@@ -1757,7 +1757,7 @@ static int check_command(struct fsg_common *common, int cmnd_size,
 
         /* Check that the LUN values are consistent */
         if (common->lun != lun)
-                DBG(common, "using LUN %d from CBW, not LUN %d from CDB\n",
+                DBG(common, "using LUN %u from CBW, not LUN %u from CDB\n",
                     common->lun, lun);
 
         /* Check the LUN */
@@ -1777,7 +1777,7 @@ static int check_command(struct fsg_common *common, int cmnd_size,
                  */
                 if (common->cmnd[0] != INQUIRY &&
                     common->cmnd[0] != REQUEST_SENSE) {
-                        DBG(common, "unsupported LUN %d\n", common->lun);
+                        DBG(common, "unsupported LUN %u\n", common->lun);
                         return -EINVAL;
                 }
         }
@@ -2169,7 +2169,7 @@ static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
         if (common->data_size == 0)
                 common->data_dir = DATA_DIR_NONE;
         common->lun = cbw->Lun;
-        if (common->lun >= 0 && common->lun < common->nluns)
+        if (common->lun < common->nluns)
                 common->curlun = &common->luns[common->lun];
         else
                 common->curlun = NULL;