linux-kernel - FAILED: Patch "cxl/acpi: Ensure ports ready at cxl_acpi_probe() return" failed to apply to v6.1-stable tree

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Message-ID: <20241106021052.181853-1-sashal@kernel.org>
Date: Tue,  5 Nov 2024 21:10:51 -0500
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	dan.j.williams@...el.com
Cc: Gregory Price <gourry@...rry.net>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Ira Weiny <ira.weiny@...el.com>,
	linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "cxl/acpi: Ensure ports ready at cxl_acpi_probe() return" failed to apply to v6.1-stable tree

The patch below does not apply to the v6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From 48f62d38a07d464a499fa834638afcfd2b68f852 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@...el.com>
Date: Tue, 22 Oct 2024 18:43:40 -0700
Subject: [PATCH] cxl/acpi: Ensure ports ready at cxl_acpi_probe() return

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: 8dd2bc0f8e02 ("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@...el.com>
Tested-by: Gregory Price <gourry@...rry.net>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Ira Weiny <ira.weiny@...el.com>
Link: https://patch.msgid.link/172964781969.81806.17276352414854540808.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 drivers/cxl/acpi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
index 82b78e331d8ed..432b7cfd12a8e 100644
--- a/drivers/cxl/acpi.c
+++ b/drivers/cxl/acpi.c
@@ -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");
-- 
2.43.0