[PATCH] cmd: Add test and fix bugs for dm drivers

[Sean Anderson]

Also CC Ovidiu and Niel, since I believe they were both working on patches related to this.

On 4/6/20 10:23 AM, Sean Anderson wrote:
> Add a test for the dm drivers command. Also fix a null pointer dereference
> revealed by said test.
> 
> Signed-off-by: Sean Anderson <seanga2 at gmail.com>
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
> Tested-by: Bin Meng <bmeng.cn at gmail.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> ---
> The changes in this patch were originally submitted as v3 of 7b9d60fc1ff
> "cmd: Add command to dump drivers and compatible strings" [1]. I have
> retained the Reviewed-by and Tested-by tags since no other changes besides
> rebasing on v1 have been made.
> 
> [1] https://patchwork.ozlabs.org/patch/1234460/
> 
>  cmd/dm.c                 |  4 ++--
>  drivers/core/dump.c      |  3 ++-
>  test/py/tests/test_dm.py | 17 +++++++++++++++++
>  3 files changed, 21 insertions(+), 3 deletions(-)
>  create mode 100644 test/py/tests/test_dm.py
> 
> diff --git a/cmd/dm.c b/cmd/dm.c
> index 108707c298..7a90685f8b 100644
> --- a/cmd/dm.c
> +++ b/cmd/dm.c
> @@ -41,7 +41,7 @@ static int do_dm_dump_devres(cmd_tbl_t *cmdtp, int flag, int argc,
>  }
>  
>  static int do_dm_dump_drivers(cmd_tbl_t *cmdtp, int flag, int argc,
> -			       char * const argv[])
> +			      char * const argv[])
>  {
>  	dm_dump_drivers();
>  
> @@ -94,5 +94,5 @@ U_BOOT_CMD(
>  	"tree          Dump driver model tree ('*' = activated)\n"
>  	"dm uclass        Dump list of instances for each uclass\n"
>  	"dm devres        Dump list of device resources for each device\n"
> -	"dm drivers       Dump list of drivers and their compatible strings\n"
> +	"dm drivers       Dump list of drivers and their compatible strings"
>  );
> diff --git a/drivers/core/dump.c b/drivers/core/dump.c
> index e73ebeabcc..b5046398d4 100644
> --- a/drivers/core/dump.c
> +++ b/drivers/core/dump.c
> @@ -107,7 +107,8 @@ void dm_dump_drivers(void)
>  	puts("Driver                Compatible\n");
>  	puts("--------------------------------\n");
>  	for (entry = d; entry < d + n_ents; entry++) {
> -		for (match = entry->of_match; match->compatible; match++)
> +		for (match = entry->of_match;
> +		     match && match->compatible; match++)
>  			printf("%-20.20s  %s\n",
>  			       match == entry->of_match ? entry->name : "",
>  			       match->compatible);
> diff --git a/test/py/tests/test_dm.py b/test/py/tests/test_dm.py
> new file mode 100644
> index 0000000000..f6fbf8ba4c
> --- /dev/null
> +++ b/test/py/tests/test_dm.py
> @@ -0,0 +1,17 @@
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (C) 2020 Sean Anderson
> +
> +import pytest
> +
> + at pytest.mark.buildconfigspec('cmd_dm')
> +def test_dm_drivers(u_boot_console):
> +    """Test that each driver in `dm tree` is also listed in `dm drivers`."""
> +    response = u_boot_console.run_command('dm tree')
> +    driver_index = response.find('Driver')
> +    assert driver_index != -1
> +    drivers = (line[driver_index:].split()[0]
> +               for line in response[:-1].split('\n')[2:])
> +
> +    response = u_boot_console.run_command('dm drivers')
> +    for driver in drivers:
> +        assert driver in response
>