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authorSuzuki K Poulose <suzuki.poulose@arm.com>2018-09-20 22:18:16 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-25 21:21:02 +0300
commit4d3ebd3658d8b87d8ead979725305adc6fae3855 (patch)
tree94c58b888aa82eb3892aa0c3631ffbfd539ed634 /drivers/hwtracing
parentb85847eeea0d90954216b1d323a5c1c0c2cf07bf (diff)
downloadlinux-4d3ebd3658d8b87d8ead979725305adc6fae3855.tar.xz
coreisght: tmc: Claim device before use
Use CLAIM tags to make sure the device is available for use. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etf.c22
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etr.c4
2 files changed, 23 insertions, 3 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 36af23d2c0f8..53fc83b72a49 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -36,6 +36,11 @@ static void __tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
static int tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
{
+ int rc = coresight_claim_device(drvdata->base);
+
+ if (rc)
+ return rc;
+
__tmc_etb_enable_hw(drvdata);
return 0;
}
@@ -63,7 +68,7 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata)
return;
}
-static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
+static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
{
CS_UNLOCK(drvdata->base);
@@ -79,6 +84,12 @@ static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
CS_LOCK(drvdata->base);
}
+static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
+{
+ coresight_disclaim_device(drvdata);
+ __tmc_etb_disable_hw(drvdata);
+}
+
static void __tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
{
CS_UNLOCK(drvdata->base);
@@ -97,6 +108,11 @@ static void __tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
static int tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
{
+ int rc = coresight_claim_device(drvdata->base);
+
+ if (rc)
+ return rc;
+
__tmc_etf_enable_hw(drvdata);
return 0;
}
@@ -107,7 +123,7 @@ static void tmc_etf_disable_hw(struct tmc_drvdata *drvdata)
tmc_flush_and_stop(drvdata);
tmc_disable_hw(drvdata);
-
+ coresight_disclaim_device_unlocked(drvdata->base);
CS_LOCK(drvdata->base);
}
@@ -553,7 +569,7 @@ int tmc_read_prepare_etb(struct tmc_drvdata *drvdata)
/* Disable the TMC if need be */
if (drvdata->mode == CS_MODE_SYSFS)
- tmc_etb_disable_hw(drvdata);
+ __tmc_etb_disable_hw(drvdata);
drvdata->reading = true;
out:
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index daad52146140..f684283890d3 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -991,6 +991,9 @@ static int tmc_etr_enable_hw(struct tmc_drvdata *drvdata,
* this on.
*/
rc = tmc_etr_enable_catu(drvdata, etr_buf);
+ if (rc)
+ return rc;
+ rc = coresight_claim_device(drvdata->base);
if (!rc) {
drvdata->etr_buf = etr_buf;
__tmc_etr_enable_hw(drvdata);
@@ -1077,6 +1080,7 @@ static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
__tmc_etr_disable_hw(drvdata);
/* Disable CATU device if this ETR is connected to one */
tmc_etr_disable_catu(drvdata);
+ coresight_disclaim_device(drvdata->base);
/* Reset the ETR buf used by hardware */
drvdata->etr_buf = NULL;
}