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Wysocki" , Len Brown , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH] ACPI: SBS: Fix present test in acpi_battery_read() Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The battery->present variable is a 1 bit bitfield in a u8. This means that the "state & (1 << battery->id)" test will only work when "battery->id" is zero, otherwise ->present is zero. Fix this by adding a !!. Fixes: db1c291af7ad ("ACPI: SBS: Make SBS reads table-driven.") Signed-off-by: Dan Carpenter --- This is a new static checker warning that Harshit and I wrote. It's untested. drivers/acpi/sbs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c index a3f95a3fffde..d3edc3bcbf01 100644 --- a/drivers/acpi/sbs.c +++ b/drivers/acpi/sbs.c @@ -487,7 +487,7 @@ static int acpi_battery_read(struct acpi_battery *batte= ry) if (result) return result; =20 - battery->present =3D state & (1 << battery->id); + battery->present =3D !!(state & (1 << battery->id)); if (!battery->present) return 0; =20 --=20 2.51.0