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cxl/pci: Honor -EPROBE_DEFER from component register setup

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cxl_pci_setup_regs() for CXL_REGLOC_RBI_COMPONENT can return
-EPROBE_DEFER on a Restricted CXL Host (RCD) when the upstream port
has not yet been enumerated and the Component Registers must be
extracted from the RCRB. cxl_pci_probe() treats every non-zero return
from that call as the benign "component registers not found" case,
logs a warning, and continues. The rc is then immediately overwritten
by the subsequent cxl_pci_type3_init_mailbox() call, so the deferral
is silently swallowed.

Return -EPROBE_DEFER instead of continuing so the probe is retried
once the upstream port is available.

Fixes: 733b57f262 ("cxl/pci: Early setup RCH dport component registers from RCRB")
Reported-by: sashiko-bot@kernel.org
Closes: https://lore.kernel.org/linux-cxl/ajzhsubot_PSYtHQ@MWDK4CY14F/T/#m063bbf76b1c9c293ade52ab311018ae6bba11a44
Assisted-by: Claude:claude-opus-4-8
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://lore.kernel.org/linux-cxl/ajzhsubot_PSYtHQ@MWDK4CY14F/T/#m063bbf76b1c9c293ade52ab311018ae6bba11a44
Link: https://patch.msgid.link/20260706224322.714934-1-dave.jiang@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Dave Jiang
2026-07-06 15:43:22 -07:00
parent 8b301c4afb
commit 430c502c80
1 changed files with 5 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/cxl/pci.c
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@@ -823,10 +823,13 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
*/
rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT,
&cxlds->reg_map);
if (rc)
if (rc) {
if (rc == -EPROBE_DEFER)
return rc;
dev_warn(&pdev->dev, "No component registers (%d)\n", rc);
else if (!cxlds->reg_map.component_map.ras.valid)
} else if (!cxlds->reg_map.component_map.ras.valid) {
dev_dbg(&pdev->dev, "RAS registers not found\n");
}
rc = cxl_pci_type3_init_mailbox(cxlds);
if (rc)