Re: [Intel-gfx] [igt-dev] [PATCH i-g-t 1/2] i915/sysfs_client: Ignore clients being closed as we read their sysfs

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

On 26/01/2021 13:05, Chris Wilson wrote:
> An earlier client from an old test may still be lingering and disappear
> as we scan the sysfs. Be graceful and let it go without tripping over it.
> 
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> ---
>   tests/i915/sysfs_clients.c | 19 +++++++++----------
>   1 file changed, 9 insertions(+), 10 deletions(-)
> 
> diff --git a/tests/i915/sysfs_clients.c b/tests/i915/sysfs_clients.c
> index 6be52c04f..a3a1f81e1 100644
> --- a/tests/i915/sysfs_clients.c
> +++ b/tests/i915/sysfs_clients.c
> @@ -62,11 +62,13 @@
>   
>   static void strterm(char *s, int len)
>   {
> -	igt_assert(len > 0);
> -
> -	s[len] = '\0';
> -	if (s[len - 1] == '\n')
> -		s[len - 1] = '\0';
> +	if (len < 0) {
> +		*s = '\0';
> +	} else {
> +		s[len] = '\0';
> +		if (s[len - 1] == '\n')
> +			s[len - 1] = '\0';
> +	}
>   }
>   
>   static void pidname(int i915, int clients)
> @@ -78,7 +80,6 @@ static void pidname(int i915, int clients)
>   	long count;
>   	pid_t pid;
>   	DIR *dir;
> -	int len;
>   
>   	dir = fdopendir(dup(clients));
>   	igt_assert(dir);
> @@ -90,13 +91,11 @@ static void pidname(int i915, int clients)
>   			continue;
>   
>   		snprintf(buf, sizeof(buf), "%s/name", de->d_name);
> -		len = igt_sysfs_read(clients, buf, buf, sizeof(buf) - 1);
> -		igt_assert_f(len > 0, "failed to open '%s/name'\n", de->d_name);
> -		strterm(buf, len);
> +		strterm(buf, igt_sysfs_read(clients, buf, buf, sizeof(buf) - 1));
>   		igt_debug("%s: %s\n", de->d_name, buf);
>   
>   		/* Ignore closed clients created by drm_driver_open() */
> -		if (*buf == '<')
> +		if (*buf == '\0' || *buf == '<')
>   			continue;
>   
>   		close(me);
> 

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Regards,

Tvrtko
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