diff options
| author |   Davidlohr Bueso <dave@stgolabs.net> | 2019-11-01 13:00:04 -0700 |
|---|---|---|
| committer |   Sasha Levin <sashal@kernel.org> | 2019-11-21 20:10:45 -0500 |
| commit | 8aea7f82153d6f292add3eb4bd7ba8edcae5c7f7 (patch) | |
| tree | 244565444f8607800b64948edd97ccf12a9e2d7d /drivers/hv | |
| parent | drivers: iommu: hyperv: Make HYPERV_IOMMU only available on x86 (diff) | |
| download | linux-dev-8aea7f82153d6f292add3eb4bd7ba8edcae5c7f7.tar.xz linux-dev-8aea7f82153d6f292add3eb4bd7ba8edcae5c7f7.zip | |
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.c | 10 |
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); |