linux-kernel - [PATCH] platform/surface: aggregator: fix a bit test

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Message-ID: <YH6UUhJhGk3mk13b@mwanda>
Date:   Tue, 20 Apr 2021 11:44:02 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Maximilian Luz <luzmaximilian@...il.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] platform/surface: aggregator: fix a bit test

The "funcs" variable is a u64.  If "func" is more than 31 then the
BIT() shift will wrap instead of testing the high bits.

Fixes: c167b9c7e3d6 ("platform/surface: Add Surface Aggregator subsystem")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/platform/surface/aggregator/controller.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/surface/aggregator/controller.c b/drivers/platform/surface/aggregator/controller.c
index 00e38284885a..69e86cd599d3 100644
--- a/drivers/platform/surface/aggregator/controller.c
+++ b/drivers/platform/surface/aggregator/controller.c
@@ -1040,7 +1040,7 @@ static int ssam_dsm_load_u32(acpi_handle handle, u64 funcs, u64 func, u32 *ret)
 	union acpi_object *obj;
 	u64 val;
 
-	if (!(funcs & BIT(func)))
+	if (!(funcs & BIT_ULL(func)))
 		return 0; /* Not supported, leave *ret at its default value */
 
 	obj = acpi_evaluate_dsm_typed(handle, &SSAM_SSH_DSM_GUID,
-- 
2.30.2