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ef3d5cf9c5
The following kmemleaks were detected when removing the cxl module
stack:
unreferenced object 0xffff88822616b800 (size 1024):
...
backtrace:
[<00000000bedc6f83>] kmalloc_trace+0x26/0x90
[<00000000448d1afc>] devm_cxl_pmu_add+0x3a/0x110 [cxl_core]
[<00000000ca3bfe16>] 0xffffffffa105213b
[<00000000ba7f78dc>] local_pci_probe+0x41/0x90
[<000000005bb027ac>] pci_device_probe+0xb0/0x1c0
...
unreferenced object 0xffff8882260abcc0 (size 16):
...
hex dump (first 16 bytes):
70 6d 75 5f 6d 65 6d 30 2e 30 00 26 82 88 ff ff pmu_mem0.0.&....
backtrace:
...
[<00000000152b5e98>] dev_set_name+0x43/0x50
[<00000000c228798b>] devm_cxl_pmu_add+0x102/0x110 [cxl_core]
[<00000000ca3bfe16>] 0xffffffffa105213b
[<00000000ba7f78dc>] local_pci_probe+0x41/0x90
[<000000005bb027ac>] pci_device_probe+0xb0/0x1c0
...
unreferenced object 0xffff8882272af200 (size 256):
...
backtrace:
[<00000000bedc6f83>] kmalloc_trace+0x26/0x90
[<00000000a14d1813>] device_add+0x4ea/0x890
[<00000000a3f07b47>] devm_cxl_pmu_add+0xbe/0x110 [cxl_core]
[<00000000ca3bfe16>] 0xffffffffa105213b
[<00000000ba7f78dc>] local_pci_probe+0x41/0x90
[<000000005bb027ac>] pci_device_probe+0xb0/0x1c0
...
devm_cxl_pmu_add() correctly registers a device remove function but it
only calls device_del() which is only part of device unregistration.
Properly call device_unregister() to free up the memory associated with
the device.
Fixes: 1ad3f701c3 ("cxl/pci: Find and register CXL PMU devices")
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20231016-pmu-unregister-fix-v1-1-1e2eb2fa3c69@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright(c) 2023 Huawei. All rights reserved. */
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/idr.h>
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#include <cxlmem.h>
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#include <pmu.h>
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#include <cxl.h>
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#include "core.h"
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static void cxl_pmu_release(struct device *dev)
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{
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struct cxl_pmu *pmu = to_cxl_pmu(dev);
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kfree(pmu);
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}
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const struct device_type cxl_pmu_type = {
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.name = "cxl_pmu",
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.release = cxl_pmu_release,
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};
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static void remove_dev(void *dev)
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{
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device_unregister(dev);
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}
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int devm_cxl_pmu_add(struct device *parent, struct cxl_pmu_regs *regs,
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int assoc_id, int index, enum cxl_pmu_type type)
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{
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struct cxl_pmu *pmu;
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struct device *dev;
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int rc;
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pmu = kzalloc(sizeof(*pmu), GFP_KERNEL);
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if (!pmu)
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return -ENOMEM;
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pmu->assoc_id = assoc_id;
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pmu->index = index;
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pmu->type = type;
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pmu->base = regs->pmu;
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dev = &pmu->dev;
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device_initialize(dev);
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device_set_pm_not_required(dev);
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dev->parent = parent;
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dev->bus = &cxl_bus_type;
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dev->type = &cxl_pmu_type;
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switch (pmu->type) {
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case CXL_PMU_MEMDEV:
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rc = dev_set_name(dev, "pmu_mem%d.%d", assoc_id, index);
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break;
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}
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if (rc)
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goto err;
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rc = device_add(dev);
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if (rc)
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goto err;
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return devm_add_action_or_reset(parent, remove_dev, dev);
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err:
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put_device(&pmu->dev);
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return rc;
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}
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EXPORT_SYMBOL_NS_GPL(devm_cxl_pmu_add, CXL);
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