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authorDavidlohr Bueso <dave@stgolabs.net>2019-11-01 13:00:04 -0700
committerSasha Levin <sashal@kernel.org>2019-11-21 20:10:45 -0500
commit8aea7f82153d6f292add3eb4bd7ba8edcae5c7f7 (patch)
tree244565444f8607800b64948edd97ccf12a9e2d7d /drivers/hv
parentd7f0b2e450e94ad3811a812236529175ae86751e (diff)
downloadlinux-8aea7f82153d6f292add3eb4bd7ba8edcae5c7f7.tar.bz2
drivers/hv: Replace binary semaphore with mutex
At a slight footprint cost (24 vs 32 bytes), mutexes are more optimal than semaphores; it's also a nicer interface for mutual exclusion, which is why they are encouraged over binary semaphores, when possible. Replace the hyperv_mmio_lock, its semantics implies traditional lock ownership; that is, the lock owner is the same for both lock/unlock operations. Therefore it is safe to convert. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/vmbus_drv.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 5d2304b4b9c8..845d2a9423ea 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -79,7 +79,7 @@ static struct notifier_block hyperv_panic_block = {
static const char *fb_mmio_name = "fb_range";
static struct resource *fb_mmio;
static struct resource *hyperv_mmio;
-static DEFINE_SEMAPHORE(hyperv_mmio_lock);
+static DEFINE_MUTEX(hyperv_mmio_lock);
static int vmbus_exists(void)
{
@@ -2018,7 +2018,7 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
int retval;
retval = -ENXIO;
- down(&hyperv_mmio_lock);
+ mutex_lock(&hyperv_mmio_lock);
/*
* If overlaps with frame buffers are allowed, then first attempt to
@@ -2065,7 +2065,7 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
}
exit:
- up(&hyperv_mmio_lock);
+ mutex_unlock(&hyperv_mmio_lock);
return retval;
}
EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
@@ -2082,7 +2082,7 @@ void vmbus_free_mmio(resource_size_t start, resource_size_t size)
{
struct resource *iter;
- down(&hyperv_mmio_lock);
+ mutex_lock(&hyperv_mmio_lock);
for (iter = hyperv_mmio; iter; iter = iter->sibling) {
if ((iter->start >= start + size) || (iter->end <= start))
continue;
@@ -2090,7 +2090,7 @@ void vmbus_free_mmio(resource_size_t start, resource_size_t size)
__release_region(iter, start, size);
}
release_mem_region(start, size);
- up(&hyperv_mmio_lock);
+ mutex_unlock(&hyperv_mmio_lock);
}
EXPORT_SYMBOL_GPL(vmbus_free_mmio);