[PATCH 3/4] hw/misc/bcm2835_property: Restrict scope of start_num, number, otp_row

[Peter Maydell <peter.maydell@linaro.org>]

In the long function bcm2835_property_mbox_push(), the variables
start_num, number and otp_row are used only in the four cases which
access OTP data, and their uses don't overlap with each other.

Make these variables have scope restricted to the cases where they're
used, so it's easier to read each individual case without having to
cross-refer up to the variable declaration at the top of the function
and check whether the variable is also used later in the loop.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/misc/bcm2835_property.c | 34 ++++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/hw/misc/bcm2835_property.c b/hw/misc/bcm2835_property.c
index 7eb623b4e90..443d42a1824 100644
--- a/hw/misc/bcm2835_property.c
+++ b/hw/misc/bcm2835_property.c
@@ -30,7 +30,6 @@ static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
     uint32_t tot_len;
     size_t resplen;
     uint32_t tmp;
-    uint32_t start_num, number, otp_row;
 
     /*
      * Copy the current state of the framebuffer config; we will update
@@ -331,22 +330,25 @@ static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
         /* Customer OTP */
 
         case RPI_FWREQ_GET_CUSTOMER_OTP:
-            start_num = ldl_le_phys(&s->dma_as, value + 12);
-            number = ldl_le_phys(&s->dma_as, value + 16);
+        {
+            uint32_t start_num = ldl_le_phys(&s->dma_as, value + 12);
+            uint32_t number = ldl_le_phys(&s->dma_as, value + 16);
 
             resplen = 8 + 4 * number;
 
             for (uint32_t n = start_num; n < start_num + number &&
                  n < BCM2835_OTP_CUSTOMER_OTP_LEN; n++) {
-                otp_row = bcm2835_otp_get_row(s->otp,
+                uint32_t otp_row = bcm2835_otp_get_row(s->otp,
                                               BCM2835_OTP_CUSTOMER_OTP + n);
                 stl_le_phys(&s->dma_as,
                             value + 20 + ((n - start_num) << 2), otp_row);
             }
             break;
+        }
         case RPI_FWREQ_SET_CUSTOMER_OTP:
-            start_num = ldl_le_phys(&s->dma_as, value + 12);
-            number = ldl_le_phys(&s->dma_as, value + 16);
+        {
+            uint32_t start_num = ldl_le_phys(&s->dma_as, value + 12);
+            uint32_t number = ldl_le_phys(&s->dma_as, value + 16);
 
             resplen = 4;
 
@@ -367,32 +369,35 @@ static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
 
             for (uint32_t n = start_num; n < start_num + number &&
                  n < BCM2835_OTP_CUSTOMER_OTP_LEN; n++) {
-                otp_row = ldl_le_phys(&s->dma_as,
+                uint32_t otp_row = ldl_le_phys(&s->dma_as,
                                       value + 20 + ((n - start_num) << 2));
                 bcm2835_otp_set_row(s->otp,
                                     BCM2835_OTP_CUSTOMER_OTP + n, otp_row);
             }
             break;
+        }
 
         /* Device-specific private key */
-
         case RPI_FWREQ_GET_PRIVATE_KEY:
-            start_num = ldl_le_phys(&s->dma_as, value + 12);
-            number = ldl_le_phys(&s->dma_as, value + 16);
+        {
+            uint32_t start_num = ldl_le_phys(&s->dma_as, value + 12);
+            uint32_t number = ldl_le_phys(&s->dma_as, value + 16);
 
             resplen = 8 + 4 * number;
 
             for (uint32_t n = start_num; n < start_num + number &&
                  n < BCM2835_OTP_PRIVATE_KEY_LEN; n++) {
-                otp_row = bcm2835_otp_get_row(s->otp,
+                uint32_t otp_row = bcm2835_otp_get_row(s->otp,
                                               BCM2835_OTP_PRIVATE_KEY + n);
                 stl_le_phys(&s->dma_as,
                             value + 20 + ((n - start_num) << 2), otp_row);
             }
             break;
+        }
         case RPI_FWREQ_SET_PRIVATE_KEY:
-            start_num = ldl_le_phys(&s->dma_as, value + 12);
-            number = ldl_le_phys(&s->dma_as, value + 16);
+        {
+            uint32_t start_num = ldl_le_phys(&s->dma_as, value + 12);
+            uint32_t number = ldl_le_phys(&s->dma_as, value + 16);
 
             resplen = 4;
 
@@ -404,12 +409,13 @@ static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
 
             for (uint32_t n = start_num; n < start_num + number &&
                  n < BCM2835_OTP_PRIVATE_KEY_LEN; n++) {
-                otp_row = ldl_le_phys(&s->dma_as,
+                uint32_t otp_row = ldl_le_phys(&s->dma_as,
                                       value + 20 + ((n - start_num) << 2));
                 bcm2835_otp_set_row(s->otp,
                                     BCM2835_OTP_PRIVATE_KEY + n, otp_row);
             }
             break;
+        }
         default:
             qemu_log_mask(LOG_UNIMP,
                           "bcm2835_property: unhandled tag 0x%08x\n", tag);
-- 
2.34.1