bootutil: swap-move: Remove check of the image size in swap_run

This check is not useful because it is already done during the
validation of the image and was also making sure there was no firmware
data in the first trailer sector, which is no more needed.

Signed-off-by: Thomas Altenbach <thomas.altenbach@legrand.com>

Author: taltenbach

boot/bootutil/src/swap_move.c

@@ -546,11 +546,8 @@ void
 swap_run(struct boot_loader_state *state, struct boot_status *bs,
          uint32_t copy_size)
 {
-    uint32_t sz;
     uint32_t sector_sz;
     uint32_t idx;
-    uint32_t trailer_sz;
-    uint32_t first_trailer_idx;
     uint32_t last_idx;
     const struct flash_area *fap_pri;
     const struct flash_area *fap_sec;
@@ -560,32 +557,6 @@ swap_run(struct boot_loader_state *state, struct boot_status *bs,
     last_idx = find_last_idx(state, copy_size);
     sector_sz = boot_img_sector_size(state, BOOT_PRIMARY_SLOT, 0);
 
-    /*
-     * When starting a new swap upgrade, check that there is enough space.
-     */
-    if (boot_status_is_reset(bs)) {
-        sz = 0;
-        trailer_sz = boot_trailer_sz(BOOT_WRITE_SZ(state));
-        first_trailer_idx = boot_img_num_sectors(state, BOOT_PRIMARY_SLOT) - 1;
-
-        while (1) {
-            sz += sector_sz;
-            if  (sz >= trailer_sz) {
-                break;
-            }
-            first_trailer_idx--;
-        }
-
-        if (last_idx >= first_trailer_idx) {
-            BOOT_LOG_WRN("Not enough free space to run swap upgrade");
-            BOOT_LOG_WRN("required %d bytes but only %d are available",
-                         (last_idx + 1) * sector_sz,
-                         first_trailer_idx * sector_sz);
-            bs->swap_type = BOOT_SWAP_TYPE_NONE;
-            return;
-        }
-    }
-
     fap_pri = BOOT_IMG_AREA(state, BOOT_PRIMARY_SLOT);
     assert(fap_pri != NULL);