linux-kernel - [PATCH] vfio/pci: use "ssize_t" as a return value instead of "size

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Message-ID: <20210727032433.457-1-caihuoqing@baidu.com>
Date:   Tue, 27 Jul 2021 11:24:33 +0800
From:   Cai Huoqing <caihuoqing@...du.com>
To:     <alex.williamson@...hat.com>, <cohuck@...hat.com>,
        <zhenyuw@...ux.intel.com>, <swee.yee.fonn@...el.com>,
        <hkallweit1@...il.com>, <fred.gao@...el.com>,
        <mjrosato@...ux.ibm.com>, <jgg@...pe.ca>, <yi.l.liu@...el.com>,
        <mgurtovoy@...dia.com>
CC:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Cai Huoqing <caihuoqing@...du.com>
Subject: [PATCH] vfio/pci: use "ssize_t" as a return value instead of "size_t"

should use ssize_t when it returns error code and size_t

Signed-off-by: Cai Huoqing <caihuoqing@...du.com>
---
 drivers/vfio/pci/vfio_pci_igd.c     | 4 ++--
 drivers/vfio/pci/vfio_pci_private.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/vfio/pci/vfio_pci_igd.c b/drivers/vfio/pci/vfio_pci_igd.c
index 228df565e9bc..3377ba379bfd 100644
--- a/drivers/vfio/pci/vfio_pci_igd.c
+++ b/drivers/vfio/pci/vfio_pci_igd.c
@@ -25,7 +25,7 @@
 #define OPREGION_RVDS		0x3c2
 #define OPREGION_VERSION	0x16
 
-static size_t vfio_pci_igd_rw(struct vfio_pci_device *vdev, char __user *buf,
+static ssize_t vfio_pci_igd_rw(struct vfio_pci_device *vdev, char __user *buf,
 			      size_t count, loff_t *ppos, bool iswrite)
 {
 	unsigned int i = VFIO_PCI_OFFSET_TO_INDEX(*ppos) - VFIO_PCI_NUM_REGIONS;
@@ -160,7 +160,7 @@ static int vfio_pci_igd_opregion_init(struct vfio_pci_device *vdev)
 	return ret;
 }
 
-static size_t vfio_pci_igd_cfg_rw(struct vfio_pci_device *vdev,
+static ssize_t vfio_pci_igd_cfg_rw(struct vfio_pci_device *vdev,
 				  char __user *buf, size_t count, loff_t *ppos,
 				  bool iswrite)
 {
diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
index 5a36272cecbf..bbc56c857ef0 100644
--- a/drivers/vfio/pci/vfio_pci_private.h
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -56,7 +56,7 @@ struct vfio_pci_device;
 struct vfio_pci_region;
 
 struct vfio_pci_regops {
-	size_t	(*rw)(struct vfio_pci_device *vdev, char __user *buf,
+	ssize_t	(*rw)(struct vfio_pci_device *vdev, char __user *buf,
 		      size_t count, loff_t *ppos, bool iswrite);
 	void	(*release)(struct vfio_pci_device *vdev,
 			   struct vfio_pci_region *region);
-- 
2.25.1