diff options
| author |   Suzuki K Poulose <suzuki.poulose@arm.com> | 2018-09-20 13:18:16 -0600 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-25 20:21:02 +0200 |
| commit | 4d3ebd3658d8b87d8ead979725305adc6fae3855 (patch) | |
| tree | 94c58b888aa82eb3892aa0c3631ffbfd539ed634 /drivers/hwtracing/coresight/coresight-tmc-etf.c | |
| parent | misc: genwqe: remove duplicated include file (diff) | |
| download | linux-dev-4d3ebd3658d8b87d8ead979725305adc6fae3855.tar.xz linux-dev-4d3ebd3658d8b87d8ead979725305adc6fae3855.zip | |
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/coresight/coresight-tmc-etf.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc-etf.c | 22 |
1 files changed, 19 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: |