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HDM cache updates need the same mapping. Factor the lookup into cxl_port_get_uport_pci_dev() and return a referenced PCI device to make caller ownership explicit. Use automatic reference cleanup in read_cdat_data(), as suggested by Li Ming, so early returns release the PCI device reference. Signed-off-by: Srirangan Madhavan Reviewed-by: Jonathan Cameron Reviewed-by: Dave Jiang Reviewed-by: Richard Cheng Reviewed-by: Li Ming --- Changes in v17: - Use an explicit pci_dev_put() on a single exit path in read_cdat_data() instead of mixing __free() with goto cleanup (Sashiko) https://sashiko.dev/#/patchset/20261029145703.2185231-1-smadhavan@nvidia.com?part=2 --- drivers/cxl/core/core.h | 1 + drivers/cxl/core/pci.c | 24 ++++++------------------ drivers/cxl/core/port.c | 26 ++++++++++++++++++++++++++ 3 files changed, 33 insertions(+), 18 deletions(-) diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h index 35eaf636adc9..983d7690c3a5 100644 --- a/drivers/cxl/core/core.h +++ b/drivers/cxl/core/core.h @@ -157,6 +157,7 @@ long cxl_pci_get_latency(struct pci_dev *pdev); int cxl_pci_get_bandwidth(struct pci_dev *pdev, struct access_coordinate *c); int cxl_port_get_switch_dport_bandwidth(struct cxl_port *port, struct access_coordinate *c); +struct pci_dev *cxl_port_get_uport_pci_dev(struct cxl_port *port); static inline struct device *port_to_host(struct cxl_port *port) { diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c index 9d807c1a002c..905892cfedef 100644 --- a/drivers/cxl/core/pci.c +++ b/drivers/cxl/core/pci.c @@ -564,26 +564,13 @@ static unsigned char cdat_checksum(void *buf, size_t size) */ void read_cdat_data(struct cxl_port *port) { - struct device *uport = port->uport_dev; + struct pci_dev *pdev = cxl_port_get_uport_pci_dev(port); struct device *dev = &port->dev; struct pci_doe_mb *doe_mb; - struct pci_dev *pdev = NULL; - struct cxl_memdev *cxlmd; struct cdat_doe_rsp *buf; size_t table_length, length; int rc; - if (is_cxl_memdev(uport)) { - struct device *host; - - cxlmd = to_cxl_memdev(uport); - host = cxlmd->dev.parent; - if (dev_is_pci(host)) - pdev = to_pci_dev(host); - } else if (dev_is_pci(uport)) { - pdev = to_pci_dev(uport); - } - if (!pdev) return; @@ -591,14 +578,14 @@ void read_cdat_data(struct cxl_port *port) CXL_DOE_PROTOCOL_TABLE_ACCESS); if (!doe_mb) { dev_dbg(dev, "No CDAT mailbox\n"); - return; + goto out; } port->cdat_available = true; if (cxl_cdat_get_length(dev, doe_mb, &length)) { dev_dbg(dev, "No CDAT length\n"); - return; + goto out; } /* @@ -624,12 +611,13 @@ void read_cdat_data(struct cxl_port *port) port->cdat.table = buf->data; port->cdat.length = length; - - return; + goto out; err: /* Don't leave table data allocated on error */ devm_kfree(dev, buf); dev_err(dev, "Failed to read/validate CDAT.\n"); +out: + pci_dev_put(pdev); } EXPORT_SYMBOL_NS_GPL(read_cdat_data, "CXL"); diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 625e4aa427db..5dc2815d82d8 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -34,6 +34,32 @@ static DEFINE_IDA(cxl_port_ida); static DEFINE_XARRAY(cxl_root_buses); +/** + * cxl_port_get_uport_pci_dev - get the PCI device for a port's upstream device + * @port: CXL port to map to a PCI device + * + * Return: A referenced PCI device, or NULL if the upstream device is not PCI. + * The caller must release the returned reference with pci_dev_put(). + */ +struct pci_dev *cxl_port_get_uport_pci_dev(struct cxl_port *port) +{ + struct device *uport = port->uport_dev; + struct device *host; + + if (is_cxl_memdev(uport)) { + struct cxl_memdev *cxlmd = to_cxl_memdev(uport); + + host = cxlmd->dev.parent; + } else { + host = uport; + } + + if (!host || !dev_is_pci(host)) + return NULL; + + return pci_dev_get(to_pci_dev(host)); +} + /* * The terminal device in PCI is NULL and @platform_bus * for platform devices (for cxl_test) -- 2.43.0