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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/pci/xen-pcifront.c
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@@ -22,6 +22,7 @@
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 #include <linux/bitops.h>
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 #include <linux/time.h>
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 #include <linux/ktime.h>
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+#include <linux/swiotlb.h>
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 #include <xen/platform_pci.h>
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 #include <asm/xen/swiotlb-xen.h>
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@@ -76,9 +77,6 @@
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 static DEFINE_SPINLOCK(pcifront_dev_lock);
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 static struct pcifront_device *pcifront_dev;
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-
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-static int verbose_request;
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-module_param(verbose_request, int, 0644);
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 static int errno_to_pcibios_err(int errno)
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 {
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@@ -190,18 +188,16 @@
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 	struct pcifront_sd *sd = bus->sysdata;
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 	struct pcifront_device *pdev = pcifront_get_pdev(sd);
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-	if (verbose_request)
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-		dev_info(&pdev->xdev->dev,
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-			 "read dev=%04x:%02x:%02x.%d - offset %x size %d\n",
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-			 pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
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-			 PCI_FUNC(devfn), where, size);
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+	dev_dbg(&pdev->xdev->dev,
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+		"read dev=%04x:%02x:%02x.%d - offset %x size %d\n",
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+		pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
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+		PCI_FUNC(devfn), where, size);
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 	err = do_pci_op(pdev, &op);
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 	if (likely(!err)) {
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-		if (verbose_request)
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-			dev_info(&pdev->xdev->dev, "read got back value %x\n",
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-				 op.value);
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+		dev_dbg(&pdev->xdev->dev, "read got back value %x\n",
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+			op.value);
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 		*val = op.value;
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 	} else if (err == -ENODEV) {
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@@ -229,12 +225,10 @@
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 	struct pcifront_sd *sd = bus->sysdata;
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 	struct pcifront_device *pdev = pcifront_get_pdev(sd);
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-	if (verbose_request)
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-		dev_info(&pdev->xdev->dev,
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-			 "write dev=%04x:%02x:%02x.%d - "
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-			 "offset %x size %d val %x\n",
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-			 pci_domain_nr(bus), bus->number,
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-			 PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val);
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+	dev_dbg(&pdev->xdev->dev,
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+		"write dev=%04x:%02x:%02x.%d - offset %x size %d val %x\n",
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+		pci_domain_nr(bus), bus->number,
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+		PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val);
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 	return errno_to_pcibios_err(do_pci_op(pdev, &op));
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 }
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@@ -291,8 +285,7 @@
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 				vector[i] = op.msix_entries[i].vector;
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 			}
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 		} else {
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-			printk(KERN_DEBUG "enable msix get value %x\n",
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-				op.value);
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+			pr_info("enable msix get value %x\n", op.value);
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 			err = op.value;
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 		}
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 	} else {
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@@ -364,12 +357,12 @@
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 	err = do_pci_op(pdev, &op);
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 	if (err == XEN_PCI_ERR_dev_not_found) {
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 		/* XXX No response from backend, what shall we do? */
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-		printk(KERN_DEBUG "get no response from backend for disable MSI\n");
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+		pr_info("get no response from backend for disable MSI\n");
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 		return;
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 	}
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 	if (err)
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 		/* how can pciback notify us fail? */
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-		printk(KERN_DEBUG "get fake response frombackend\n");
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+		pr_info("get fake response from backend\n");
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 }
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 static struct xen_pci_frontend_ops pci_frontend_ops = {
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@@ -1104,7 +1097,7 @@
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 	case XenbusStateClosed:
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 		if (xdev->state == XenbusStateClosed)
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 			break;
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-		/* Missed the backend's CLOSING state -- fallthrough */
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+		fallthrough;	/* Missed the backend's CLOSING state */
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 	case XenbusStateClosing:
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 		dev_warn(&xdev->dev, "backend going away!\n");
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 		pcifront_try_disconnect(pdev);