linux-kernel - [PATCH v2 3/3] staging: greybus: use __force when assigning __u8 value to snd_ctl_elem_type

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Date:   Sat,  3 Oct 2020 07:30:56 +0800
From:   Coiby Xu <coiby.xu@...il.com>
To:     devel@...verdev.osuosl.org
Cc:     Alex Elder <elder@...aro.org>,
        Vaibhav Agarwal <vaibhav.sr@...il.com>,
        Mark Greer <mgreer@...malcreek.com>,
        Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        greybus-dev@...ts.linaro.org (moderated list:GREYBUS SUBSYSTEM),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 3/3] staging: greybus: use __force when assigning __u8 value to snd_ctl_elem_type_t

(struct gb_audio_ctl_elem_info*)->type has the type of __u8 so there is no
concern about the byte order. __force is safe to use.

Found by sparse,

$ make C=2 drivers/staging/greybus/
drivers/staging/greybus/audio_topology.c:185:24: warning: cast to restricted snd_ctl_elem_type_t

Suggested-by: Alex Elder <elder@...aro.org>
Signed-off-by: Coiby Xu <coiby.xu@...il.com>
---
 drivers/staging/greybus/audio_topology.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
index 2091031659de..662e3e8b4b63 100644
--- a/drivers/staging/greybus/audio_topology.c
+++ b/drivers/staging/greybus/audio_topology.c
@@ -182,7 +182,7 @@ static int gbcodec_mixer_ctl_info(struct snd_kcontrol *kcontrol,
 	/* update uinfo */
 	uinfo->access = data->access;
 	uinfo->count = data->vcount;
-	uinfo->type = (snd_ctl_elem_type_t)info->type;
+	uinfo->type = (__force snd_ctl_elem_type_t)info->type;
 
 	switch (info->type) {
 	case GB_AUDIO_CTL_ELEM_TYPE_BOOLEAN:
-- 
2.28.0