linux-kernel - [PATCH 4.20 39/50] drm/amd/powerplay: Fix missing break in switch

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Date:   Wed, 13 Feb 2019 19:38:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 4.20 39/50] drm/amd/powerplay: Fix missing break in switch

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gustavo A. R. Silva <gustavo@...eddedor.com>

commit 2f10d823739680d2477ce34437e8a08a53117f40 upstream.

Add missing break statement in order to prevent the code from falling
through to the default case.

The resoning for this is that pclk_vol_table is an automatic variable.
So, it makes no sense to update it just before falling through to the
default case and return -EINVAL.

This bug was found thanks to the ongoing efforts to enabling
-Wimplicit-fallthrough.

Fixes: cd70f3d6e3fa ("drm/amd/powerplay: PP/DAL interface changes for dynamic clock switch")
Cc: stable@...r.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c
@@ -1005,6 +1005,7 @@ static int smu10_get_clock_by_type_with_
 		break;
 	case amd_pp_dpp_clock:
 		pclk_vol_table = pinfo->vdd_dep_on_dppclk;
+		break;
 	default:
 		return -EINVAL;
 	}