diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2017-04-14 09:14:34 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-04-18 20:26:09 +0300 |
| commit | 8b06b884cd98f7ec8b5028680b99fabfb7b3e192 (patch) | |
| tree | dde4af2e717639c5681a8855f7bad11b72291340 /tools | |
| parent | 9ccaed4bfd4f186e8350ffc7d8f188f8d2991fd9 (diff) | |
| download | linux-8b06b884cd98f7ec8b5028680b99fabfb7b3e192.tar.xz | |
tools/testing/nvdimm: fix nfit_test shutdown crash
Keep the nfit_test instances alive until after nfit_test_teardown(), as
we may be doing resource lookups until the final un-registrations have
completed. This fixes crashes of the form.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
IP: __release_resource+0x12/0x90
Call Trace:
remove_resource+0x23/0x40
__wrap_remove_resource+0x29/0x30 [nfit_test_iomap]
acpi_nfit_remove_resource+0xe/0x10 [nfit]
devm_action_release+0xf/0x20
release_nodes+0x16d/0x2b0
devres_release_all+0x3c/0x60
device_release+0x21/0x90
kobject_release+0x6a/0x170
kobject_put+0x2f/0x60
put_device+0x17/0x20
platform_device_unregister+0x20/0x30
nfit_test_exit+0x36/0x960 [nfit_test]
Reported-by: Linda Knippers <linda.knippers@hpe.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/nvdimm/test/nfit.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c index bc02f28ed8b8..d7fb1b894128 100644 --- a/tools/testing/nvdimm/test/nfit.c +++ b/tools/testing/nvdimm/test/nfit.c @@ -1958,6 +1958,7 @@ static __init int nfit_test_init(void) put_device(&pdev->dev); goto err_register; } + get_device(&pdev->dev); rc = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); if (rc) @@ -1976,6 +1977,10 @@ static __init int nfit_test_init(void) if (instances[i]) platform_device_unregister(&instances[i]->pdev); nfit_test_teardown(); + for (i = 0; i < NUM_NFITS; i++) + if (instances[i]) + put_device(&instances[i]->pdev.dev); + return rc; } @@ -1983,10 +1988,13 @@ static __exit void nfit_test_exit(void) { int i; - platform_driver_unregister(&nfit_test_driver); for (i = 0; i < NUM_NFITS; i++) platform_device_unregister(&instances[i]->pdev); + platform_driver_unregister(&nfit_test_driver); nfit_test_teardown(); + + for (i = 0; i < NUM_NFITS; i++) + put_device(&instances[i]->pdev.dev); class_destroy(nfit_test_dimm); } |