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>
diff --git a/drivers/xen/xen-pciback/conf_space.c b/drivers/xen/xen-pciback/conf_space.c
index a803144..444345a 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 f14b30f..3daf862 100644
--- a/drivers/xen/xen-pciback/conf_space_header.c
+++ b/drivers/xen/xen-pciback/conf_space_header.c
@@ -15,7 +15,6 @@
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 @@
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 921a889..7476791 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 @@
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 e01e4b6..828dddc 100644
--- a/drivers/xen/xen-pciback/passthrough.c
+++ b/drivers/xen/xen-pciback/passthrough.c
@@ -176,7 +176,7 @@
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 aec214a..1b47480 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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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_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 a0e131a..d095acd 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 @@
* 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 @@
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 @@
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 @@
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 @@
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 8c95c34..63616d7 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 4a42cfb..a778552 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 @@
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 @@
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 978d2c6..522f2da 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 @@
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 @@
.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)
{