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coresight: tmc-etr: Handle errors enabling CATU 

Make sure we honor the errors in CATU device and abort the operation.
While at it, delay setting the etr_buf for the session until we are
sure that we are indeed enabling the ETR.

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>
This commit is contained in:
Suzuki K Poulose 2018-09-20 13:18:05 -06:00 committed by Greg Kroah-Hartman
parent 6276f9cba5
commit 1c7995e11c
1 changed files with 12 additions and 7 deletions
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19
drivers/hwtracing/coresight/coresight-tmc-etr.c
View File

@ -751,12 +751,14 @@ tmc_etr_get_catu_device(struct tmc_drvdata *drvdata)
return NULL;
}
static inline void tmc_etr_enable_catu(struct tmc_drvdata *drvdata)
static inline int tmc_etr_enable_catu(struct tmc_drvdata *drvdata,
struct etr_buf *etr_buf)
{
struct coresight_device *catu = tmc_etr_get_catu_device(drvdata);
if (catu && helper_ops(catu)->enable)
helper_ops(catu)->enable(catu, drvdata->etr_buf);
return helper_ops(catu)->enable(catu, etr_buf);
return 0;
}
static inline void tmc_etr_disable_catu(struct tmc_drvdata *drvdata)
@ -971,6 +973,8 @@ static void __tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
static int tmc_etr_enable_hw(struct tmc_drvdata *drvdata,
struct etr_buf *etr_buf)
{
int rc;
/* Callers should provide an appropriate buffer for use */
if (WARN_ON(!etr_buf))
return -EINVAL;
@ -982,16 +986,17 @@ static int tmc_etr_enable_hw(struct tmc_drvdata *drvdata,
if (WARN_ON(drvdata->etr_buf))
return -EBUSY;
/* Set the buffer for the session */
drvdata->etr_buf = etr_buf;
/*
* If this ETR is connected to a CATU, enable it before we turn
* this on.
*/
tmc_etr_enable_catu(drvdata);
rc = tmc_etr_enable_catu(drvdata, etr_buf);
if (!rc) {
drvdata->etr_buf = etr_buf;
__tmc_etr_enable_hw(drvdata);
}
__tmc_etr_enable_hw(drvdata);
return 0;
return rc;
}
/*