From: Robert Richter <rrichter@amd.com>
To: Alison Schofield <alison.schofield@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
Ira Weiny <ira.weiny@intel.com>,
Ben Widawsky <bwidawsk@kernel.org>,
Dan Williams <dan.j.williams@intel.com>
Cc: <linux-cxl@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Len Brown <lenb@kernel.org>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
"Davidlohr Bueso" <dave@stgolabs.net>,
Robert Richter <rrichter@amd.com>
Subject: [PATCH v2 10/12] cxl: Do not ignore PCI config read errors in match_add_dports()
Date: Tue, 18 Oct 2022 15:23:38 +0200 [thread overview]
Message-ID: <20221018132341.76259-11-rrichter@amd.com> (raw)
In-Reply-To: <20221018132341.76259-1-rrichter@amd.com>
The link capabilities of a PCI device are read when enumerating its
dports. This is done by reading the PCI config space. If that fails
port enumeration ignores that error. However, reading the PCI config
space should reliably work.
To reduce some complexity to the code flow when factoring out parts of
the code in match_add_dports() for later reuse, change this to throw
an error.
Signed-off-by: Robert Richter <rrichter@amd.com>
---
drivers/cxl/core/pci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index 0dbbe8d39b07..8271b8abde7a 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -47,7 +47,7 @@ static int match_add_dports(struct pci_dev *pdev, void *data)
return 0;
if (pci_read_config_dword(pdev, pci_pcie_cap(pdev) + PCI_EXP_LNKCAP,
&lnkcap))
- return 0;
+ return -ENXIO;
rc = cxl_find_regblock(pdev, CXL_REGLOC_RBI_COMPONENT, &map);
if (rc)
--
2.30.2
next prev parent reply other threads:[~2022-10-18 13:26 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-18 13:23 [PATCH v2 00/12] cxl: Add support for Restricted CXL hosts (RCD mode) Robert Richter
2022-10-18 13:23 ` [PATCH v2 01/12] cxl/core: Remove duplicate declaration of devm_cxl_iomap_block() Robert Richter
2022-10-20 23:56 ` Dan Williams
2022-10-21 8:54 ` Robert Richter
2022-10-18 13:23 ` [PATCH v2 02/12] cxl/core: Check physical address before mapping it in devm_cxl_iomap_block() Robert Richter
2022-10-21 0:01 ` Dan Williams
2022-10-18 13:23 ` [PATCH v2 03/12] cxl: Unify debug messages when calling devm_cxl_add_port() Robert Richter
2022-10-21 0:20 ` Dan Williams
2022-10-21 8:57 ` Robert Richter
2022-10-18 13:23 ` [PATCH v2 04/12] cxl: Unify debug messages when calling devm_cxl_add_dport() Robert Richter
2022-10-21 0:32 ` Dan Williams
2022-10-21 9:00 ` Robert Richter
2022-10-18 13:23 ` [PATCH v2 05/12] cxl/acpi: Improve debug messages in cxl_acpi_probe() Robert Richter
2022-10-21 1:00 ` Dan Williams
2022-10-18 13:23 ` [PATCH v2 06/12] cxl/acpi: Extract component registers of restricted hosts from RCRB Robert Richter
2022-10-18 13:31 ` Rafael J. Wysocki
2022-10-18 18:41 ` Robert Richter
2022-10-18 18:57 ` Rafael J. Wysocki
2022-10-19 10:46 ` Robert Richter
2022-10-21 5:17 ` Dan Williams
2022-10-24 21:04 ` Robert Richter
2022-10-24 21:24 ` Dan Williams
2022-10-24 22:37 ` Dan Williams
[not found] ` <63cd195a-f5d0-b016-d833-b3a9c86ff6ee@intel.com>
2022-10-24 23:50 ` Robert Richter
2022-10-24 23:57 ` Dan Williams
2022-10-18 13:23 ` [PATCH v2 07/12] cxl: Remove dev_is_cxl_root_child() check in devm_cxl_enumerate_ports() Robert Richter
2022-10-21 5:38 ` Dan Williams
2022-10-21 6:32 ` Verma, Vishal L
2022-11-09 14:33 ` Robert Richter
2022-10-18 13:23 ` [PATCH v2 08/12] cxl: Factor out code in devm_cxl_enumerate_ports() to find_port_attach_ep() Robert Richter
2022-10-18 13:23 ` [PATCH v2 09/12] cxl: Extend devm_cxl_enumerate_ports() to support restricted devices (RCDs) Robert Richter
2022-10-18 13:23 ` Robert Richter [this message]
2022-10-18 13:23 ` [PATCH v2 11/12] cxl: Factor out code in match_add_dports() to pci_dev_add_dport() Robert Richter
2022-10-18 13:23 ` [PATCH v2 12/12] cxl: Extend devm_cxl_port_enumerate_dports() to support restricted hosts (RCH) Robert Richter
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