drivers: core: lists: fix for loop index type

* fixes the bug in function bind_drivers_pass that for
CONFIG_CC_OPTIMIZE_FOR_SIZE=n and no entries in the driver_info list,
i.e. n_ents == 0, the processor steps into the first loop iteration
despite the loop condition being false.
* the Xilinx Zynq-7000 device would eventually hang due to an attempted
access to an invalid memory address
* the bug is fixed by changing the type of idx from uint to int

Board: zynq-zybo
Target: ARM
Compiler: arm-none-eabi-gcc 9.2.1

Signed-off-by: Alexander Preissner <fpga-garage@preissner-muc.de>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/core/lists.c b/drivers/core/lists.c
index 5d4f2ea..d2e9dc5 100644 (file)
--- a/drivers/core/lists.c
+++ b/drivers/core/lists.c
@@ -58,7 +58,7 @@ static int bind_drivers_pass(struct udevice *parent, bool pre_reloc_only)
        const int n_ents = ll_entry_count(struct driver_info, driver_info);
        bool missing_parent = false;
        int result = 0;
-       uint idx;
+       int idx;
 
        /*
         * Do one iteration through the driver_info records. For of-platdata,