linux-kernel - [PATCH v15 6/7] PCI: endpoint: pci-epf-vntb: fix sparse build warning at epf

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Date:   Tue,  1 Nov 2022 12:57:08 -0400
From:   Frank Li <Frank.Li@....com>
To:     mani@...nel.org
Cc:     Frank.Li@....com, allenbh@...il.com, bhelgaas@...gle.com,
        dave.jiang@...el.com, helgaas@...nel.org, imx@...ts.linux.dev,
        jdmason@...zu.us, kw@...ux.com, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, lpieralisi@...nel.org,
        ntb@...ts.linux.dev
Subject: [PATCH v15 6/7] PCI: endpoint: pci-epf-vntb: fix sparse build warning at epf_db

From: Frank Li <frank.li@....com>

Using epf_db[i] instead of readl() because epf_db is in local
system memory and allocated by dma_alloc_coherent().

Signed-off-by: Frank Li <frank.li@....com>
---
 drivers/pci/endpoint/functions/pci-epf-vntb.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index 54616281da9e..f896846ed970 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
@@ -136,7 +136,7 @@ struct epf_ntb {
 
 	struct epf_ntb_ctrl *reg;
 
-	void __iomem *epf_db;
+	u32 *epf_db;
 
 	phys_addr_t vpci_mw_phy[MAX_MW];
 	void __iomem *vpci_mw_addr[MAX_MW];
@@ -257,12 +257,10 @@ static void epf_ntb_cmd_handler(struct work_struct *work)
 	ntb = container_of(work, struct epf_ntb, cmd_handler.work);
 
 	for (i = 1; i < ntb->db_count; i++) {
-		if (readl(ntb->epf_db + i * sizeof(u32))) {
-			if (readl(ntb->epf_db + i * sizeof(u32)))
-				ntb->db |= 1 << (i - 1);
-
+		if (ntb->epf_db[i]) {
+			ntb->db |= 1 << (i - 1);
 			ntb_db_event(&ntb->ntb, i);
-			writel(0, ntb->epf_db + i * sizeof(u32));
+			ntb->epf_db[i] = 0;
 		}
 	}
 
-- 
2.34.1