From 7a877c923995b8257069209b1d757735af4f4ce0 Mon Sep 17 00:00:00 2001 From: Dave Jiang Date: Sat, 11 Mar 2023 15:40:16 +0100 Subject: [PATCH] cxl/pci: Simplify CDAT retrieval error path The cdat.table and cdat.length fields in struct cxl_port are set before CDAT retrieval and must therefore be unset on failure. Simplify by setting only on success. Suggested-by: Jonathan Cameron Link: https://lore.kernel.org/linux-cxl/20230209113422.00007017@Huawei.com/ Signed-off-by: Dave Jiang [lukas: rebase and rephrase commit message] Signed-off-by: Lukas Wunner Reviewed-by: Ira Weiny Reviewed-by: Jonathan Cameron Acked-by: Bjorn Helgaas Link: https://lore.kernel.org/r/7a5c7104fb6a3016dbaec1c5d0ed34619ea11a0c.1678543498.git.lukas@wunner.de Signed-off-by: Dan Williams --- drivers/cxl/core/pci.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c index c868f4a..0609bd6 100644 --- a/drivers/cxl/core/pci.c +++ b/drivers/cxl/core/pci.c @@ -475,10 +475,10 @@ static int cxl_cdat_get_length(struct device *dev, static int cxl_cdat_read_table(struct device *dev, struct pci_doe_mb *cdat_doe, - struct cxl_cdat *cdat) + void *cdat_table, size_t *cdat_length) { - size_t length = cdat->length; - __le32 *data = cdat->table; + size_t length = *cdat_length; + __le32 *data = cdat_table; int entry_handle = 0; do { @@ -522,7 +522,7 @@ static int cxl_cdat_read_table(struct device *dev, } while (entry_handle != CXL_DOE_TABLE_ACCESS_LAST_ENTRY); /* Length in CDAT header may exceed concatenation of CDAT entries */ - cdat->length -= length; + *cdat_length -= length; return 0; } @@ -542,6 +542,7 @@ void read_cdat_data(struct cxl_port *port) struct cxl_dev_state *cxlds = cxlmd->cxlds; struct pci_dev *pdev = to_pci_dev(cxlds->dev); size_t cdat_length; + void *cdat_table; int rc; cdat_doe = pci_find_doe_mailbox(pdev, PCI_DVSEC_VENDOR_ID_CXL, @@ -558,19 +559,19 @@ void read_cdat_data(struct cxl_port *port) return; } - port->cdat.table = devm_kzalloc(dev, cdat_length, GFP_KERNEL); - if (!port->cdat.table) + cdat_table = devm_kzalloc(dev, cdat_length, GFP_KERNEL); + if (!cdat_table) return; - port->cdat.length = cdat_length; - rc = cxl_cdat_read_table(dev, cdat_doe, &port->cdat); + rc = cxl_cdat_read_table(dev, cdat_doe, cdat_table, &cdat_length); if (rc) { /* Don't leave table data allocated on error */ - devm_kfree(dev, port->cdat.table); - port->cdat.table = NULL; - port->cdat.length = 0; + devm_kfree(dev, cdat_table); dev_err(dev, "CDAT data read error\n"); } + + port->cdat.table = cdat_table; + port->cdat.length = cdat_length; } EXPORT_SYMBOL_NS_GPL(read_cdat_data, CXL); -- 2.7.4