diff options
Diffstat (limited to 'drivers/xen/xen-pciback/xenbus.c')
| -rw-r--r-- | drivers/xen/xen-pciback/xenbus.c | 27 |
1 files changed, 11 insertions, 16 deletions
diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c index 18db31f13a4..075525945e3 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; @@ -44,7 +43,7 @@ static struct xen_pcibk_device *alloc_pdev(struct xenbus_device *xdev) pdev->xdev = xdev; dev_set_drvdata(&xdev->dev, pdev); - spin_lock_init(&pdev->dev_lock); + mutex_init(&pdev->dev_lock); pdev->sh_info = NULL; pdev->evtchn_irq = INVALID_EVTCHN_IRQ; @@ -62,14 +61,12 @@ out: static void xen_pcibk_disconnect(struct xen_pcibk_device *pdev) { - spin_lock(&pdev->dev_lock); - + mutex_lock(&pdev->dev_lock); /* Ensure the guest can't trigger our handler before removing devices */ if (pdev->evtchn_irq != INVALID_EVTCHN_IRQ) { unbind_from_irqhandler(pdev->evtchn_irq, pdev); pdev->evtchn_irq = INVALID_EVTCHN_IRQ; } - spin_unlock(&pdev->dev_lock); /* If the driver domain started an op, make sure we complete it * before releasing the shared memory */ @@ -77,13 +74,11 @@ static void xen_pcibk_disconnect(struct xen_pcibk_device *pdev) /* Note, the workqueue does not use spinlocks at all.*/ flush_workqueue(xen_pcibk_wq); - spin_lock(&pdev->dev_lock); if (pdev->sh_info != NULL) { xenbus_unmap_ring_vfree(pdev->xdev, pdev->sh_info); pdev->sh_info = NULL; } - spin_unlock(&pdev->dev_lock); - + mutex_unlock(&pdev->dev_lock); } static void free_pdev(struct xen_pcibk_device *pdev) @@ -120,9 +115,7 @@ static int xen_pcibk_do_attach(struct xen_pcibk_device *pdev, int gnt_ref, goto out; } - spin_lock(&pdev->dev_lock); pdev->sh_info = vaddr; - spin_unlock(&pdev->dev_lock); err = bind_interdomain_evtchn_to_irqhandler( pdev->xdev->otherend_id, remote_evtchn, xen_pcibk_handle_event, @@ -132,10 +125,7 @@ static int xen_pcibk_do_attach(struct xen_pcibk_device *pdev, int gnt_ref, "Error binding event channel to IRQ"); goto out; } - - spin_lock(&pdev->dev_lock); pdev->evtchn_irq = err; - spin_unlock(&pdev->dev_lock); err = 0; dev_dbg(&pdev->xdev->dev, "Attached!\n"); @@ -150,6 +140,7 @@ static int xen_pcibk_attach(struct xen_pcibk_device *pdev) char *magic = NULL; + mutex_lock(&pdev->dev_lock); /* Make sure we only do this setup once */ if (xenbus_read_driver_state(pdev->xdev->nodename) != XenbusStateInitialised) @@ -176,7 +167,7 @@ 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; } @@ -194,6 +185,7 @@ static int xen_pcibk_attach(struct xen_pcibk_device *pdev) dev_dbg(&pdev->xdev->dev, "Connected? %d\n", err); out: + mutex_unlock(&pdev->dev_lock); kfree(magic); @@ -371,6 +363,7 @@ static int xen_pcibk_reconfigure(struct xen_pcibk_device *pdev) dev_dbg(&pdev->xdev->dev, "Reconfiguring device ...\n"); + mutex_lock(&pdev->dev_lock); /* Make sure we only reconfigure once */ if (xenbus_read_driver_state(pdev->xdev->nodename) != XenbusStateReconfiguring) @@ -508,6 +501,7 @@ static int xen_pcibk_reconfigure(struct xen_pcibk_device *pdev) } out: + mutex_unlock(&pdev->dev_lock); return 0; } @@ -564,6 +558,7 @@ static int xen_pcibk_setup_backend(struct xen_pcibk_device *pdev) char dev_str[64]; char state_str[64]; + mutex_lock(&pdev->dev_lock); /* It's possible we could get the call to setup twice, so make sure * we're not already connected. */ @@ -644,10 +639,10 @@ static int xen_pcibk_setup_backend(struct xen_pcibk_device *pdev) "Error switching to initialised state!"); out: + mutex_unlock(&pdev->dev_lock); if (!err) /* see if pcifront is already configured (if not, we'll wait) */ xen_pcibk_attach(pdev); - return err; } @@ -726,7 +721,7 @@ 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) { |