[PATCH v14 6/7] PCI: endpoint: pci-epf-vntb: fix sparse build warning at epf_db

From: Frank Li <Frank.Li@nxp.com>
To: frank.li@nxp.com
Cc: allenbh@gmail.com, bhelgaas@google.com, dave.jiang@intel.com,
	helgaas@kernel.org, imx@lists.linux.dev, jdmason@kudzu.us,
	kw@linux.com, linux-kernel@vger.kernel.org,
	linux-pci@vger.kernel.org, lpieralisi@kernel.org,
	mani@kernel.org, ntb@lists.linux.dev
Subject: [PATCH v14 6/7] PCI: endpoint: pci-epf-vntb: fix sparse build warning at epf_db
Date: Fri, 28 Oct 2022 11:57:02 -0400	[thread overview]
Message-ID: <20221028155703.318928-7-Frank.Li@nxp.com> (raw)
In-Reply-To: <20221028155703.318928-1-Frank.Li@nxp.com>

From: Frank Li <frank.li@nxp.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@nxp.com>
---
 drivers/pci/endpoint/functions/pci-epf-vntb.c | 9 +++------
 1 file changed, 3 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..db3455c1589b 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 +257,9 @@ 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_event(&ntb->ntb, i);
-			writel(0, ntb->epf_db + i * sizeof(u32));
+			ntb->epf_db[i] = 0;
 		}
 	}
 
-- 
2.34.1

