linux-kernel - [PATCH v2] xen-pciback: fix INTERRUPT_TYPE

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Message-Id: <20200320030929.24735-1-marmarek@invisiblethingslab.com>
Date:   Fri, 20 Mar 2020 04:09:18 +0100
From:   Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>
To:     xen-devel@...ts.xenproject.org
Cc:     Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Simon Gaiser <simon@...isiblethingslab.com>,
        Roger Pau Monné <roger.pau@...rix.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] xen-pciback: fix INTERRUPT_TYPE_* defines

xen_pcibk_get_interrupt_type() assumes INTERRUPT_TYPE_NONE being 0
(initialize ret to 0 and return as INTERRUPT_TYPE_NONE).
Fix the definition to make INTERRUPT_TYPE_NONE really 0, and also shift
other values to not leave holes.
But also, do not assume INTERRUPT_TYPE_NONE being 0 anymore to avoid
similar confusions in the future.

Fixes: 476878e4b2be ("xen-pciback: optionally allow interrupt enable flag writes")
Signed-off-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
---
Changes in v2:
 - don't depend on INTERRUPT_TYPE_NONE being 0
---
 drivers/xen/xen-pciback/conf_space.c | 2 +-
 drivers/xen/xen-pciback/conf_space.h | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/xen/xen-pciback/conf_space.c b/drivers/xen/xen-pciback/conf_space.c
index b20e43e148ce..da51a5d34e6e 100644
--- a/drivers/xen/xen-pciback/conf_space.c
+++ b/drivers/xen/xen-pciback/conf_space.c
@@ -320,7 +320,7 @@ int xen_pcibk_get_interrupt_type(struct pci_dev *dev)
 		if (val & PCI_MSIX_FLAGS_ENABLE)
 			ret |= INTERRUPT_TYPE_MSIX;
 	}
-	return ret;
+	return ret ?: INTERRUPT_TYPE_NONE;
 }
 
 void xen_pcibk_config_free_dyn_fields(struct pci_dev *dev)
diff --git a/drivers/xen/xen-pciback/conf_space.h b/drivers/xen/xen-pciback/conf_space.h
index 28c45180a12e..5fe431c79f25 100644
--- a/drivers/xen/xen-pciback/conf_space.h
+++ b/drivers/xen/xen-pciback/conf_space.h
@@ -65,10 +65,10 @@ struct config_field_entry {
 	void *data;
 };
 
-#define INTERRUPT_TYPE_NONE (1<<0)
-#define INTERRUPT_TYPE_INTX (1<<1)
-#define INTERRUPT_TYPE_MSI  (1<<2)
-#define INTERRUPT_TYPE_MSIX (1<<3)
+#define INTERRUPT_TYPE_NONE (0)
+#define INTERRUPT_TYPE_INTX (1<<0)
+#define INTERRUPT_TYPE_MSI  (1<<1)
+#define INTERRUPT_TYPE_MSIX (1<<2)
 
 extern bool xen_pcibk_permissive;
 
-- 
2.21.1