[PATCH 2/9] util: simplify virPCIFile() and its callers

[Laine Stump]

There is no need for a temporary variable in this function, and ever
since we switched to glib for memory allocation, there is no possibility
it can return NULL, so callers don't need to check for it.

Signed-off-by: Laine Stump <laine at redhat.com>
---
 src/util/virpci.c | 34 ++++++++++++++--------------------
 1 file changed, 14 insertions(+), 20 deletions(-)

diff --git a/src/util/virpci.c b/src/util/virpci.c
index 6fa8acd246..0786ddd478 100644
--- a/src/util/virpci.c
+++ b/src/util/virpci.c
@@ -219,10 +219,7 @@ virPCIDriverDir(const char *driver)
 static char *
 virPCIFile(const char *device, const char *file)
 {
-    char *buffer;
-
-    buffer = g_strdup_printf(PCI_SYSFS "devices/%s/%s", device, file);
-    return buffer;
+    return g_strdup_printf(PCI_SYSFS "devices/%s/%s", device, file);
 }
 
 
@@ -240,9 +237,9 @@ virPCIDeviceGetDriverPathAndName(virPCIDevicePtr dev, char **path, char **name)
     g_autofree char *drvlink = NULL;
 
     *path = *name = NULL;
+
     /* drvlink = "/sys/bus/pci/dddd:bb:ss.ff/driver" */
-    if (!(drvlink = virPCIFile(dev->name, "driver")))
-        goto cleanup;
+    drvlink = virPCIFile(dev->name, "driver");
 
     if (!virFileExists(drvlink)) {
         ret = 0;
@@ -376,8 +373,7 @@ virPCIDeviceReadClass(virPCIDevicePtr dev, uint16_t *device_class)
     g_autofree char *id_str = NULL;
     unsigned int value;
 
-    if (!(path = virPCIFile(dev->name, "class")))
-        return -1;
+    path = virPCIFile(dev->name, "class");
 
     /* class string is '0xNNNNNN\n' ... i.e. 9 bytes */
     if (virFileReadAll(path, 9, &id_str) < 0)
@@ -1054,8 +1050,7 @@ virPCIDeviceUnbind(virPCIDevicePtr dev)
         /* The device is not bound to any driver */
         return 0;
 
-    if (!(path = virPCIFile(dev->name, "driver/unbind")))
-        return -1;
+    path = virPCIFile(dev->name, "driver/unbind");
 
     if (virFileExists(path)) {
         if (virFileWriteStr(path, dev->name, 0) < 0) {
@@ -1111,8 +1106,7 @@ virPCIDeviceBindWithDriverOverride(virPCIDevicePtr dev,
 {
     g_autofree char *path = NULL;
 
-    if (!(path = virPCIFile(dev->name, "driver_override")))
-        return -1;
+    path = virPCIFile(dev->name, "driver_override");
 
     if (virFileWriteStr(path, driverName, 0) < 0) {
         virReportSystemError(errno,
@@ -1159,10 +1153,11 @@ virPCIDeviceBindToStub(virPCIDevicePtr dev)
         return -1;
     }
 
-    if (!(stubDriverPath = virPCIDriverDir(stubDriverName))  ||
-        !(driverLink = virPCIFile(dev->name, "driver")))
+    if (!(stubDriverPath = virPCIDriverDir(stubDriverName)))
         return -1;
 
+    driverLink = virPCIFile(dev->name, "driver");
+
     if (virFileExists(driverLink)) {
         if (virFileLinkPointsTo(driverLink, stubDriverPath)) {
             /* The device is already bound to the correct driver */
@@ -1259,8 +1254,7 @@ virPCIDeviceReadID(virPCIDevicePtr dev, const char *id_name)
     g_autofree char *path = NULL;
     char *id_str;
 
-    if (!(path = virPCIFile(dev->name, id_name)))
-        return NULL;
+    path = virPCIFile(dev->name, id_name);
 
     /* ID string is '0xNNNN\n' ... i.e. 7 bytes */
     if (virFileReadAll(path, 7, &id_str) < 0)
@@ -1924,8 +1918,8 @@ virPCIDeviceAddressGetIOMMUGroupNum(virPCIDeviceAddressPtr addr)
     devName = g_strdup_printf(VIR_PCI_DEVICE_ADDRESS_FMT, addr->domain, addr->bus,
                               addr->slot, addr->function);
 
-    if (!(devPath = virPCIFile(devName, "iommu_group")))
-        return -1;
+    devPath = virPCIFile(devName, "iommu_group");
+
     if (virFileIsLink(devPath) != 1)
         return -2;
     if (virFileResolveLink(devPath, &groupPath) < 0) {
@@ -1973,8 +1967,8 @@ virPCIDeviceGetIOMMUGroupDev(virPCIDevicePtr dev)
     g_autofree char *groupPath = NULL;
     g_autofree char *groupFile = NULL;
 
-    if (!(devPath = virPCIFile(dev->name, "iommu_group")))
-        return NULL;
+    devPath = virPCIFile(dev->name, "iommu_group");
+
     if (virFileIsLink(devPath) != 1) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Invalid device %s iommu_group file %s is not a symlink"),
-- 
2.26.2