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cxl/acpi: Ensure ports ready at cxl_acpi_probe() return

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In order to ensure root CXL ports are enabled upon cxl_acpi_probe()
when the 'cxl_port' driver is built as a module, arrange for the
module to be pre-loaded or built-in.

The "Fixes:" but no "Cc: stable" on this patch reflects that the issue
is merely by inspection since the bug that triggered the discovery of
this potential problem [1] is fixed by other means. However, a stable
backport should do no harm.

Fixes: 8dd2bc0f8e ("cxl/mem: Add the cxl_mem driver")
Link: http://lore.kernel.org/20241004212504.1246-1-gourry@gourry.net [1]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://patch.msgid.link/172964781969.81806.17276352414854540808.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
This commit is contained in:
Dan Williams 2024-10-22 18:43:40 -07:00 committed by Ira Weiny
parent 3d6ebf1643
commit 48f62d38a0
1 changed files with 7 additions and 0 deletions
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7
drivers/cxl/acpi.c
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@ -924,6 +924,13 @@ static void __exit cxl_acpi_exit(void)
/* load before dax_hmem sees 'Soft Reserved' CXL ranges */
subsys_initcall(cxl_acpi_init);
/*
* Arrange for host-bridge ports to be active synchronous with
* cxl_acpi_probe() exit.
*/
MODULE_SOFTDEP("pre: cxl_port");
module_exit(cxl_acpi_exit);
MODULE_DESCRIPTION("CXL ACPI: Platform Support");
MODULE_LICENSE("GPL v2");