xen/pciback: miscellaneous adjustments

This is a minor bugfix and a set of small cleanups; as it is not clear
whether this needs splitting into pieces (and if so, at what
granularity), it is a single combined patch.
- add a missing return statement to an error path in
  kill_domain_by_device()
- use pci_is_enabled() rather than raw atomic_read()
- remove a bogus attempt to zero-terminate an already zero-terminated
  string
- #define DRV_NAME once uniformly in the shared local header
- make DRIVER_ATTR() variables static
- eliminate a pointless use of list_for_each_entry_safe()
- add MODULE_ALIAS()
- a little bit of constification
- adjust a few messages
- remove stray semicolons from inline function definitions

Signed-off-by: Jan Beulich <jbeulich@suse.com>
[v1: Dropped the resource_size fix, altered the description]
[v2: Fixed cleanpatch.pl comments]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

9 files changed, 44 insertions, 44 deletions

diff --git a/drivers/xen/xen-pciback/conf_space.c b/drivers/xen/xen-pciback/conf_space.c
index a8031445d94e..444345afbd5c 100644
--- a/drivers/xen/xen-pciback/conf_space.c
+++ b/drivers/xen/xen-pciback/conf_space.c
@@ -15,7 +15,6 @@
 #include "conf_space.h"
 #include "conf_space_quirks.h"
 
-#define DRV_NAME        "xen-pciback"
 static int permissive;
 module_param(permissive, bool, 0644);
 
diff --git a/drivers/xen/xen-pciback/conf_space_header.c b/drivers/xen/xen-pciback/conf_space_header.c
index f14b30f71464..3daf862d739d 100644
--- a/drivers/xen/xen-pciback/conf_space_header.c
+++ b/drivers/xen/xen-pciback/conf_space_header.c
@@ -15,7 +15,6 @@ struct pci_bar_info {
         int which;
 };
 
-#define DRV_NAME        "xen-pciback"
 #define is_enable_cmd(value) ((value)&(PCI_COMMAND_MEMORY|PCI_COMMAND_IO))
 #define is_master_cmd(value) ((value)&PCI_COMMAND_MASTER)
 
@@ -25,7 +24,7 @@ static int command_read(struct pci_dev *dev, int offset, u16 *value, void *data)
         int ret;
 
         ret = xen_pcibk_read_config_word(dev, offset, value, data);
-        if (!atomic_read(&dev->enable_cnt))
+        if (!pci_is_enabled(dev))
                 return ret;
 
         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
diff --git a/drivers/xen/xen-pciback/conf_space_quirks.c b/drivers/xen/xen-pciback/conf_space_quirks.c
index 921a889e65eb..7476791cab40 100644
--- a/drivers/xen/xen-pciback/conf_space_quirks.c
+++ b/drivers/xen/xen-pciback/conf_space_quirks.c
@@ -12,7 +12,6 @@
 #include "conf_space_quirks.h"
 
 LIST_HEAD(xen_pcibk_quirks);
-#define DRV_NAME        "xen-pciback"
 static inline const struct pci_device_id *
 match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
 {
@@ -36,7 +35,7 @@ static struct xen_pcibk_config_quirk *xen_pcibk_find_quirk(struct pci_dev *dev)
                         goto out;
         tmp_quirk = NULL;
         printk(KERN_DEBUG DRV_NAME
-               ":quirk didn't match any device xen_pciback knows about\n");
+               ": quirk didn't match any device known\n");
 out:
         return tmp_quirk;
 }
diff --git a/drivers/xen/xen-pciback/passthrough.c b/drivers/xen/xen-pciback/passthrough.c
index e01e4b6ef267..828dddc360df 100644
--- a/drivers/xen/xen-pciback/passthrough.c
+++ b/drivers/xen/xen-pciback/passthrough.c
@@ -176,7 +176,7 @@ static int __xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
         return 1;
 }
 
-struct xen_pcibk_backend xen_pcibk_passthrough_backend = {
+const struct xen_pcibk_backend xen_pcibk_passthrough_backend = {
         .name           = "passthrough",
         .init           = __xen_pcibk_init_devices,
         .free           = __xen_pcibk_release_devices,
diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
index aec214ac0a14..1b474804180a 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -21,8 +21,6 @@
 #include "conf_space.h"
 #include "conf_space_quirks.h"
 
-#define DRV_NAME        "xen-pciback"
-
 static char *pci_devs_to_hide;
 wait_queue_head_t xen_pcibk_aer_wait_queue;
 /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
@@ -514,12 +512,14 @@ static void kill_domain_by_device(struct pcistub_device *psdev)
         int err;
         char nodename[PCI_NODENAME_MAX];
 
-        if (!psdev)
+        if (!psdev) {
                 dev_err(&psdev->dev->dev,
                         "device is NULL when do AER recovery/kill_domain\n");
+                return;
+        }
+
         snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
                 psdev->pdev->xdev->otherend_id);
-        nodename[strlen(nodename)] = '\0';
 
 again:
         err = xenbus_transaction_start(&xbt);
@@ -605,7 +605,7 @@ static pci_ers_result_t common_process(struct pcistub_device *psdev,
         if (test_bit(_XEN_PCIF_active,
                 (unsigned long *)&psdev->pdev->sh_info->flags)) {
                 dev_dbg(&psdev->dev->dev,
-                        "schedule pci_conf service in xen_pcibk\n");
+                        "schedule pci_conf service in " DRV_NAME "\n");
                 xen_pcibk_test_and_schedule_op(psdev->pdev);
         }
 
@@ -995,8 +995,7 @@ out:
                 err = count;
         return err;
 }
-
-DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add);
+static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add);
 
 static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf,
                                    size_t count)
@@ -1015,8 +1014,7 @@ out:
                 err = count;
         return err;
 }
-
-DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove);
+static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove);
 
 static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
 {
@@ -1039,8 +1037,7 @@ static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
 
         return count;
 }
-
-DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL);
+static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL);
 
 static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
 {
@@ -1069,8 +1066,7 @@ static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
         return count;
 }
-
-DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL);
+static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL);
 
 static ssize_t pcistub_irq_handler_switch(struct device_driver *drv,
                                           const char *buf,
@@ -1106,7 +1102,8 @@ out:
                 err = count;
         return err;
 }
-DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL, pcistub_irq_handler_switch);
+static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL,
+                   pcistub_irq_handler_switch);
 
 static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf,
                                  size_t count)
@@ -1170,8 +1167,8 @@ out:
 
         return count;
 }
-
-DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show, pcistub_quirk_add);
+static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show,
+                   pcistub_quirk_add);
 
 static ssize_t permissive_add(struct device_driver *drv, const char *buf,
                               size_t count)
@@ -1236,8 +1233,8 @@ static ssize_t permissive_show(struct device_driver *drv, char *buf)
         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
         return count;
 }
-
-DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show, permissive_add);
+static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show,
+                   permissive_add);
 
 static void pcistub_exit(void)
 {
@@ -1374,3 +1371,4 @@ module_init(xen_pcibk_init);
 module_exit(xen_pcibk_cleanup);
 
 MODULE_LICENSE("Dual BSD/GPL");
+MODULE_ALIAS("xen-backend:pci");
diff --git a/drivers/xen/xen-pciback/pciback.h b/drivers/xen/xen-pciback/pciback.h
index a0e131a81503..d095acdc0e65 100644
--- a/drivers/xen/xen-pciback/pciback.h
+++ b/drivers/xen/xen-pciback/pciback.h
@@ -15,6 +15,8 @@
 #include <linux/atomic.h>
 #include <xen/interface/io/pciif.h>
 
+#define DRV_NAME        "xen-pciback"
+
 struct pci_dev_entry {
         struct list_head list;
         struct pci_dev *dev;
@@ -89,7 +91,7 @@ typedef int (*publish_pci_root_cb) (struct xen_pcibk_device *pdev,
  *  passthrough - BDFs are exactly like in the host.
  */
 struct xen_pcibk_backend {
-        char *name;
+        const char *name;
         int (*init)(struct xen_pcibk_device *pdev);
         void (*free)(struct xen_pcibk_device *pdev);
         int (*find)(struct pci_dev *pcidev, struct xen_pcibk_device *pdev,
@@ -104,9 +106,9 @@ struct xen_pcibk_backend {
                                unsigned int devfn);
 };
 
-extern struct xen_pcibk_backend xen_pcibk_vpci_backend;
-extern struct xen_pcibk_backend xen_pcibk_passthrough_backend;
-extern struct xen_pcibk_backend *xen_pcibk_backend;
+extern const struct xen_pcibk_backend xen_pcibk_vpci_backend;
+extern const struct xen_pcibk_backend xen_pcibk_passthrough_backend;
+extern const struct xen_pcibk_backend *xen_pcibk_backend;
 
 static inline int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
                                         struct pci_dev *dev,
@@ -116,13 +118,14 @@ static inline int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
         if (xen_pcibk_backend && xen_pcibk_backend->add)
                 return xen_pcibk_backend->add(pdev, dev, devid, publish_cb);
         return -1;
-};
+}
+
 static inline void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
                                              struct pci_dev *dev)
 {
         if (xen_pcibk_backend && xen_pcibk_backend->free)
                 return xen_pcibk_backend->release(pdev, dev);
-};
+}
 
 static inline struct pci_dev *
 xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, unsigned int domain,
@@ -131,7 +134,8 @@ xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, unsigned int domain,
         if (xen_pcibk_backend && xen_pcibk_backend->get)
                 return xen_pcibk_backend->get(pdev, domain, bus, devfn);
         return NULL;
-};
+}
+
 /**
 * Add for domain0 PCIE-AER handling. Get guest domain/bus/devfn in xen_pcibk
 * before sending aer request to pcifront, so that guest could identify
@@ -148,25 +152,29 @@ static inline int xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
                 return xen_pcibk_backend->find(pcidev, pdev, domain, bus,
                                                devfn);
         return -1;
-};
+}
+
 static inline int xen_pcibk_init_devices(struct xen_pcibk_device *pdev)
 {
         if (xen_pcibk_backend && xen_pcibk_backend->init)
                 return xen_pcibk_backend->init(pdev);
         return -1;
-};
+}
+
 static inline int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
                                               publish_pci_root_cb cb)
 {
         if (xen_pcibk_backend && xen_pcibk_backend->publish)
                 return xen_pcibk_backend->publish(pdev, cb);
         return -1;
-};
+}
+
 static inline void xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
 {
         if (xen_pcibk_backend && xen_pcibk_backend->free)
                 return xen_pcibk_backend->free(pdev);
-};
+}
+
 /* Handles events from front-end */
 irqreturn_t xen_pcibk_handle_event(int irq, void *dev_id);
 void xen_pcibk_do_op(struct work_struct *data);
diff --git a/drivers/xen/xen-pciback/pciback_ops.c b/drivers/xen/xen-pciback/pciback_ops.c
index 8c95c3415b75..63616d7453e6 100644
--- a/drivers/xen/xen-pciback/pciback_ops.c
+++ b/drivers/xen/xen-pciback/pciback_ops.c
@@ -10,7 +10,6 @@
 #include <linux/sched.h>
 #include "pciback.h"
 
-#define DRV_NAME        "xen-pciback"
 int verbose_request;
 module_param(verbose_request, int, 0644);
 
diff --git a/drivers/xen/xen-pciback/vpci.c b/drivers/xen/xen-pciback/vpci.c
index 4a42cfb0959d..a7785525f253 100644
--- a/drivers/xen/xen-pciback/vpci.c
+++ b/drivers/xen/xen-pciback/vpci.c
@@ -12,7 +12,6 @@
 #include "pciback.h"
 
 #define PCI_SLOT_MAX 32
-#define DRV_NAME        "xen-pciback"
 
 struct vpci_dev_data {
         /* Access to dev_list must be protected by lock */
@@ -150,9 +149,9 @@ static void __xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
         spin_lock_irqsave(&vpci_dev->lock, flags);
 
         for (slot = 0; slot < PCI_SLOT_MAX; slot++) {
-                struct pci_dev_entry *e, *tmp;
-                list_for_each_entry_safe(e, tmp, &vpci_dev->dev_list[slot],
-                                         list) {
+                struct pci_dev_entry *e;
+
+                list_for_each_entry(e, &vpci_dev->dev_list[slot], list) {
                         if (e->dev == dev) {
                                 list_del(&e->list);
                                 found_dev = e->dev;
@@ -247,7 +246,7 @@ static int __xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
         return found;
 }
 
-struct xen_pcibk_backend xen_pcibk_vpci_backend = {
+const struct xen_pcibk_backend xen_pcibk_vpci_backend = {
         .name           = "vpci",
         .init           = __xen_pcibk_init_devices,
         .free           = __xen_pcibk_release_devices,
diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
index 978d2c6f5dca..522f2daa96cc 100644
--- a/drivers/xen/xen-pciback/xenbus.c
+++ b/drivers/xen/xen-pciback/xenbus.c
@@ -13,7 +13,6 @@
 #include <asm/xen/pci.h>
 #include "pciback.h"
 
-#define DRV_NAME        "xen-pciback"
 #define INVALID_EVTCHN_IRQ  (-1)
 struct workqueue_struct *xen_pcibk_wq;
 
@@ -176,7 +175,7 @@ static int xen_pcibk_attach(struct xen_pcibk_device *pdev)
         if (magic == NULL || strcmp(magic, XEN_PCI_MAGIC) != 0) {
                 xenbus_dev_fatal(pdev->xdev, -EFAULT,
                                  "version mismatch (%s/%s) with pcifront - "
-                                 "halting xen_pcibk",
+                                 "halting " DRV_NAME,
                                  magic, XEN_PCI_MAGIC);
                 goto out;
         }
@@ -724,7 +723,7 @@ static struct xenbus_driver xenbus_xen_pcibk_driver = {
         .otherend_changed       = xen_pcibk_frontend_changed,
 };
 
-struct xen_pcibk_backend *xen_pcibk_backend;
+const struct xen_pcibk_backend *__read_mostly xen_pcibk_backend;
 
 int __init xen_pcibk_xenbus_register(void)
 {