Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Zumeng Chen <zumeng.chen@gmail.com>,
        Lee Jones <lee.jones@linaro.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL 4.18 111/131] mfd: ti_am335x_tscadc: Fix struct clk
 memory leak
Thread-Topic: [PATCH AUTOSEL 4.18 111/131] mfd: ti_am335x_tscadc: Fix struct
 clk memory leak
Thread-Index: AQHUQr2bX/frDxhQbU+4fRlLop/QPw==
Date:   Sun, 2 Sep 2018 13:05:22 +0000
Message-ID: <20180902064601.183036-111-alexander.levin@microsoft.com>
References: <20180902064601.183036-1-alexander.levin@microsoft.com>
In-Reply-To: <20180902064601.183036-1-alexander.levin@microsoft.com>
Accept-Language: en-US
Content-Language: en-US
received-spf: None (protection.outlook.com: microsoft.com does not designate
 permitted sender hosts)
spamdiagnosticoutput: 1:99
spamdiagnosticmetadata: NSPM
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-Network-Message-Id: 3608ac92-6f50-460d-51bd-08d610d4c7d1
X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Sep 2018 13:05:22.2749
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0184
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

From: Zumeng Chen <zumeng.chen@gmail.com>

[ Upstream commit c2b1509c77a99a0dcea0a9051ca743cb88385f50 ]

Use devm_elk_get() to let Linux manage struct clk memory to avoid the follo=
wing
memory leakage report:

unreferenced object 0xdd75efc0 (size 64):
  comm "systemd-udevd", pid 186, jiffies 4294945126 (age 1195.750s)
  hex dump (first 32 bytes):
    61 64 63 5f 74 73 63 5f 66 63 6b 00 00 00 00 00  adc_tsc_fck.....
    00 00 00 00 92 03 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<c0a15260>] kmemleak_alloc+0x40/0x74
    [<c0287a10>] __kmalloc_track_caller+0x198/0x388
    [<c0255610>] kstrdup+0x40/0x5c
    [<c025565c>] kstrdup_const+0x30/0x3c
    [<c0636630>] __clk_create_clk+0x60/0xac
    [<c0630918>] clk_get_sys+0x74/0x144
    [<c0630cdc>] clk_get+0x5c/0x68
    [<bf0ac540>] ti_tscadc_probe+0x260/0x468 [ti_am335x_tscadc]
    [<c06f3c0c>] platform_drv_probe+0x60/0xac
    [<c06f1abc>] driver_probe_device+0x214/0x2dc
    [<c06f1c18>] __driver_attach+0x94/0xc0
    [<c06efe2c>] bus_for_each_dev+0x90/0xa0
    [<c06f1470>] driver_attach+0x28/0x30
    [<c06f1030>] bus_add_driver+0x184/0x1ec
    [<c06f2b74>] driver_register+0xb0/0xf0
    [<c06f3b4c>] __platform_driver_register+0x40/0x54

Signed-off-by: Zumeng Chen <zumeng.chen@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/mfd/ti_am335x_tscadc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.=
c
index 47012c0899cd..7a30546880a4 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -209,14 +209,13 @@ static	int ti_tscadc_probe(struct platform_device *pd=
ev)
 	 * The TSC_ADC_SS controller design assumes the OCP clock is
 	 * at least 6x faster than the ADC clock.
 	 */
-	clk =3D clk_get(&pdev->dev, "adc_tsc_fck");
+	clk =3D devm_clk_get(&pdev->dev, "adc_tsc_fck");
 	if (IS_ERR(clk)) {
 		dev_err(&pdev->dev, "failed to get TSC fck\n");
 		err =3D PTR_ERR(clk);
 		goto err_disable_clk;
 	}
 	clock_rate =3D clk_get_rate(clk);
-	clk_put(clk);
 	tscadc->clk_div =3D clock_rate / ADC_CLK;
=20
 	/* TSCADC_CLKDIV needs to be configured to the value minus 1 */
--=20
2.17.1