drivers: thermal: qcom: tsens: Fix memory leak from qfprom read

memory returned as part of nvmem_read via qfprom_read should be
freed by the consumer once done.
Existing code is not doing it so fix it.

Below memory leak detected by kmemleak
   [<ffffff80088b7658>] kmemleak_alloc+0x50/0x84
    [<ffffff80081df120>] __kmalloc+0xe8/0x168
    [<ffffff80086db350>] nvmem_cell_read+0x30/0x80
    [<ffffff8008632790>] qfprom_read+0x4c/0x7c
    [<ffffff80086335a4>] calibrate_v1+0x34/0x204
    [<ffffff8008632518>] tsens_probe+0x164/0x258
    [<ffffff80084e0a1c>] platform_drv_probe+0x80/0xa0
    [<ffffff80084de4f4>] really_probe+0x208/0x248
    [<ffffff80084de2c4>] driver_probe_device+0x98/0xc0
    [<ffffff80084dec54>] __device_attach_driver+0x9c/0xac
    [<ffffff80084dca74>] bus_for_each_drv+0x60/0x8c
    [<ffffff80084de634>] __device_attach+0x8c/0x100
    [<ffffff80084de6c8>] device_initial_probe+0x20/0x28
    [<ffffff80084dcbb8>] bus_probe_device+0x34/0x7c
    [<ffffff80084deb08>] deferred_probe_work_func+0x6c/0x98
    [<ffffff80080c3da8>] process_one_work+0x160/0x2f8

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Acked-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

diff --git a/drivers/thermal/qcom/tsens-8960.c b/drivers/thermal/qcom/tsens-8960.c
index 8d9b721dadb6522122891f7fbff59ea8922fe488..e46a4e3f25c42d8dd33ddb83fb4070a97e1e29ec 100644 (file)
--- a/drivers/thermal/qcom/tsens-8960.c
+++ b/drivers/thermal/qcom/tsens-8960.c
@@ -229,6 +229,8 @@ static int calibrate_8960(struct tsens_priv *priv)
        for (i = 0; i < num_read; i++, s++)
                s->offset = data[i];
 
+       kfree(data);
+
        return 0;
 }
 

diff --git a/drivers/thermal/qcom/tsens-v0_1.c b/drivers/thermal/qcom/tsens-v0_1.c
index 6f26fadf4c27918606e7b93f1be557c98b89ec7d..055647bcee67d33387414276bd8be385e582f20f 100644 (file)
--- a/drivers/thermal/qcom/tsens-v0_1.c
+++ b/drivers/thermal/qcom/tsens-v0_1.c
@@ -145,8 +145,10 @@ static int calibrate_8916(struct tsens_priv *priv)
                return PTR_ERR(qfprom_cdata);
 
        qfprom_csel = (u32 *)qfprom_read(priv->dev, "calib_sel");
-       if (IS_ERR(qfprom_csel))
+       if (IS_ERR(qfprom_csel)) {
+               kfree(qfprom_cdata);
                return PTR_ERR(qfprom_csel);
+       }
 
        mode = (qfprom_csel[0] & MSM8916_CAL_SEL_MASK) >> MSM8916_CAL_SEL_SHIFT;
        dev_dbg(priv->dev, "calibration mode is %d\n", mode);
@@ -181,6 +183,8 @@ static int calibrate_8916(struct tsens_priv *priv)
        }
 
        compute_intercept_slope(priv, p1, p2, mode);
+       kfree(qfprom_cdata);
+       kfree(qfprom_csel);
 
        return 0;
 }
@@ -198,8 +202,10 @@ static int calibrate_8974(struct tsens_priv *priv)
                return PTR_ERR(calib);
 
        bkp = (u32 *)qfprom_read(priv->dev, "calib_backup");
-       if (IS_ERR(bkp))
+       if (IS_ERR(bkp)) {
+               kfree(calib);
                return PTR_ERR(bkp);
+       }
 
        calib_redun_sel =  bkp[1] & BKP_REDUN_SEL;
        calib_redun_sel >>= BKP_REDUN_SHIFT;
@@ -313,6 +319,8 @@ static int calibrate_8974(struct tsens_priv *priv)
        }
 
        compute_intercept_slope(priv, p1, p2, mode);
+       kfree(calib);
+       kfree(bkp);
 
        return 0;
 }

diff --git a/drivers/thermal/qcom/tsens-v1.c b/drivers/thermal/qcom/tsens-v1.c
index 10b595d4f619982b1b5ef6b23e4cf26b302cbae5..870f502f2cb6c6184ecb8bb61aed7fe58b95cacf 100644 (file)
--- a/drivers/thermal/qcom/tsens-v1.c
+++ b/drivers/thermal/qcom/tsens-v1.c
@@ -138,6 +138,7 @@ static int calibrate_v1(struct tsens_priv *priv)
        }
 
        compute_intercept_slope(priv, p1, p2, mode);
+       kfree(qfprom_cdata);
 
        return 0;
 }

diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
index 2fd94997245bfd6f8aed5d3a4adced8a8a02b24b..b89083b61c383596e3c5c25642fd5d5256c97c72 100644 (file)
--- a/drivers/thermal/qcom/tsens.h
+++ b/drivers/thermal/qcom/tsens.h
@@ -17,6 +17,7 @@
 
 #include <linux/thermal.h>
 #include <linux/regmap.h>
+#include <linux/slab.h>
 
 struct tsens_priv;