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linux/tools/testing/cxl
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Dan Williams f1347e1386 tools/testing/cxl: Fix cxl_hdm_decode_init() calling convention 
commit 863fdccdc5 upstream.

This failing signature:

[    8.392669] cxl_bus_probe: cxl_port endpoint2: probe: 970997760
[    8.392670] cxl_port: probe of endpoint2 failed with error 970997760
[    8.392719] create_endpoint: cxl_mem mem0: add: endpoint2
[    8.392721] cxl_mem mem0: endpoint2 failed probe
[    8.392725] cxl_bus_probe: cxl_mem mem0: probe: -6

...shows cxl_hdm_decode_init() resulting in a return code ("970997760")
that looks like stack corruption. The problem goes away if
cxl_hdm_decode_init() is not mocked via __wrap_cxl_hdm_decode_init().

The corruption results from the mismatch that the calling convention for
cxl_hdm_decode_init() is:

int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm)

...and __wrap_cxl_hdm_decode_init() is:

bool __wrap_cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm)

...i.e. an int is expected but __wrap_hdm_decode_init() returns bool.

Fix the convention and cleanup the organization to match
__wrap_cxl_await_media_ready() as the difference was a red herring that
distracted from finding the bug.

Fixes: 92804edb11 ("cxl/pci: Drop @info argument to cxl_hdm_decode_init()")
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Adam Manzanares <a.manzanares@samsung.com>
Link: https://lore.kernel.org/r/165603870776.551046.8709990108936497723.stgit@dwillia2-xfh
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2022-08-25 11:45:24 +02:00
..
test tools/testing/cxl: Fix cxl_hdm_decode_init() calling convention 2022-08-25 11:45:24 +02:00
config_check.c tools/testing/cxl: Introduce a mocked-up CXL port hierarchy 2021-09-21 13:47:10 -07:00
Kbuild cxl/mem: Merge cxl_dvsec_ranges() and cxl_hdm_decode_init() 2022-05-19 08:50:41 -07:00
mock_acpi.c cxl/core: Generalize dport enumeration in the core 2022-02-08 22:57:30 -08:00