[PATCH v1 1/4] coresight: etm4x: Add lock for reading virtual context ID comparator
From: Leo Yan <hidden>
Date: 2021-10-31 14:42:55
Also in:
lkml
Subsystem:
arm/coresight framework and drivers, hardware tracing facilities, the rest · Maintainers:
Suzuki K Poulose, Alexander Shishkin, Linus Torvalds
When read the virtual context ID comparator value via sysfs node, the driver firstly reads out the index, then reads the comparator value based on index. This patch adds the spinlock to protect the atomicity for up two steps. Signed-off-by: Leo Yan <redacted> --- drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
index a0640fa5c55b..e4c8c44d04ef 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c@@ -2111,7 +2111,9 @@ static ssize_t vmid_val_show(struct device *dev, struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); struct etmv4_config *config = &drvdata->config; + spin_lock(&drvdata->spinlock); val = (unsigned long)config->vmid_val[config->vmid_idx]; + spin_unlock(&drvdata->spinlock); return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); }
--
2.25.1
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