From: Leo Yan <leo.yan@arm.com>
To: Suzuki K Poulose <suzuki.poulose@arm.com>,
Mike Leach <mike.leach@linaro.org>,
James Clark <james.clark@linaro.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Yeoreum Yun <yeoreum.yun@arm.com>,
coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: Leo Yan <leo.yan@arm.com>
Subject: [PATCH] coresight: replicator: Fix panic for clearing claim tag
Date: Fri, 2 May 2025 12:11:08 +0100 [thread overview]
Message-ID: <20250502111108.2726217-1-leo.yan@arm.com> (raw)
On platforms with a static replicator, a kernel panic occurs during boot:
[ 4.999406] replicator_probe+0x1f8/0x360
[ 5.003455] replicator_platform_probe+0x64/0xd8
[ 5.008115] platform_probe+0x70/0xf0
[ 5.011812] really_probe+0xc4/0x2a8
[ 5.015417] __driver_probe_device+0x80/0x140
[ 5.019813] driver_probe_device+0xe4/0x170
[ 5.024032] __driver_attach+0x9c/0x1b0
[ 5.027900] bus_for_each_dev+0x7c/0xe8
[ 5.031769] driver_attach+0x2c/0x40
[ 5.035373] bus_add_driver+0xec/0x218
[ 5.039154] driver_register+0x68/0x138
[ 5.043023] __platform_driver_register+0x2c/0x40
[ 5.047771] coresight_init_driver+0x4c/0xe0
[ 5.052079] replicator_init+0x30/0x48
[ 5.055865] do_one_initcall+0x4c/0x280
[ 5.059736] kernel_init_freeable+0x1ec/0x3c8
[ 5.064134] kernel_init+0x28/0x1f0
[ 5.067655] ret_from_fork+0x10/0x20
A static replicator doesn't have registers, so accessing the claim
register results in a NULL pointer deference. Fixes the issue by
accessing the claim registers only after the I/O resource has been
successfully mapped.
Fixes: 6f4c6f70575f ("coresight: Clear self hosted claim tag on probe")
Signed-off-by: Leo Yan <leo.yan@arm.com>
---
drivers/hwtracing/coresight/coresight-replicator.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index f1d2f764e898..06efd2b01a0f 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -262,6 +262,7 @@ static int replicator_probe(struct device *dev, struct resource *res)
drvdata->base = base;
desc.groups = replicator_groups;
desc.access = CSDEV_ACCESS_IOMEM(base);
+ coresight_clear_self_claim_tag(&desc.access);
}
if (fwnode_property_present(dev_fwnode(dev),
@@ -284,7 +285,6 @@ static int replicator_probe(struct device *dev, struct resource *res)
desc.pdata = dev->platform_data;
desc.dev = dev;
- coresight_clear_self_claim_tag(&desc.access);
drvdata->csdev = coresight_register(&desc);
if (IS_ERR(drvdata->csdev)) {
ret = PTR_ERR(drvdata->csdev);
--
2.34.1
next reply other threads:[~2025-05-02 11:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-02 11:11 Leo Yan [this message]
2025-05-06 9:27 ` James Clark
2025-05-06 9:57 ` Leo Yan
2025-05-06 11:05 ` Suzuki K Poulose
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