[Intel-gfx] [PATCH i-g-t] i915/gem_exec_capture: Check the strlen() for an empty file

[Antonio Argenziano]

On 29/01/19 03:24, Chris Wilson wrote:
> igt_sysfs_get() only returns NULL if the open() fails, and a valid
> string otherwise. So if the read() fails with ENODEV (because sysfs
> doesn't provide the driver with an ->open() callback), we return an
> empty string, and "No error captured" otherwise.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109481
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

LGTM.

Reviwed-by: Antonio Argenziano <antonio.argenziano at intel.com>

> ---
>   tests/i915/gem_exec_capture.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/i915/gem_exec_capture.c b/tests/i915/gem_exec_capture.c
> index eca73ab11..56837dfca 100644
> --- a/tests/i915/gem_exec_capture.c
> +++ b/tests/i915/gem_exec_capture.c
> @@ -519,6 +519,11 @@ static bool has_capture(int fd)
>   	return async > 0;
>   }
>   
> +static size_t safer_strlen(const char *s)
> +{
> +	return s ? strlen(s) : 0;
> +}
> +
>   igt_main
>   {
>   	const struct intel_execution_engine *e;
> @@ -544,7 +549,7 @@ igt_main
>   
>   		dir = igt_sysfs_open(fd, NULL);
>   		igt_require(igt_sysfs_set(dir, "error", "Begone!"));
> -		igt_require(igt_sysfs_get(dir, "error"));
> +		igt_require(safer_strlen(igt_sysfs_get(dir, "error")) > 0);
>   	}
>   
>   	for (e = intel_execution_engines; e->name; e++) {
>