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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-27 18:25:51 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-27 18:25:51 +0300
commit523634db145a22cd5562714d4c59ea74686afe38 (patch)
tree14f3fa773866d9afe83af9257ff0dffac84e25ac /drivers/nvdimm/region_devs.c
parent5168afe6ef596eaf2ff7a533b780c79ce14445e4 (diff)
parent87a30e1f05d73a34e6d1895065541369131aaf1c (diff)
downloadlinux-523634db145a22cd5562714d4c59ea74686afe38.tar.xz
Merge tag 'libnvdimm-fixes-5.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm fixes from Dan Williams: "A collection of locking and async operations fixes for v5.3-rc2. These had been soaking in a branch targeting the merge window, but missed due to a regression hunt. This fixed up version has otherwise been in -next this past week with no reported issues. In order to gain confidence in the locking changes the pull also includes a debug / instrumentation patch to enable lockdep coverage for libnvdimm subsystem operations that depend on the device_lock for exclusion. As mentioned in the changelog it is a hack, but it works and documents the locking expectations of the sub-system in a way that others can use lockdep to verify. The driver core touches got an ack from Greg. Summary: - Fix duplicate device_unregister() calls (multiple threads competing to do unregister work when scheduling device removal from a sysfs attribute of the self-same device). - Fix badblocks registration order bug. Ensure region badblocks are initialized in advance of namespace registration. - Fix a deadlock between the bus lock and probe operations. - Export device-core infrastructure to coordinate async operations via the device ->dead state. - Add device-core infrastructure to validate device_lock() usage with lockdep" * tag 'libnvdimm-fixes-5.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: driver-core, libnvdimm: Let device subsystems add local lockdep coverage libnvdimm/bus: Fix wait_nvdimm_bus_probe_idle() ABBA deadlock libnvdimm/bus: Stop holding nvdimm_bus_list_mutex over __nd_ioctl() libnvdimm/bus: Prepare the nd_ioctl() path to be re-entrant libnvdimm/region: Register badblocks before namespaces libnvdimm/bus: Prevent duplicate device_unregister() calls drivers/base: Introduce kill_device()
Diffstat (limited to 'drivers/nvdimm/region_devs.c')
-rw-r--r--drivers/nvdimm/region_devs.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 56f2227f192a..af30cbe7a8ea 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -331,7 +331,7 @@ static ssize_t set_cookie_show(struct device *dev,
* the v1.1 namespace label cookie definition. To read all this
* data we need to wait for probing to settle.
*/
- device_lock(dev);
+ nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
if (nd_region->ndr_mappings) {
@@ -348,7 +348,7 @@ static ssize_t set_cookie_show(struct device *dev,
}
}
nvdimm_bus_unlock(dev);
- device_unlock(dev);
+ nd_device_unlock(dev);
if (rc)
return rc;
@@ -424,10 +424,12 @@ static ssize_t available_size_show(struct device *dev,
* memory nvdimm_bus_lock() is dropped, but that's userspace's
* problem to not race itself.
*/
+ nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
available = nd_region_available_dpa(nd_region);
nvdimm_bus_unlock(dev);
+ nd_device_unlock(dev);
return sprintf(buf, "%llu\n", available);
}
@@ -439,10 +441,12 @@ static ssize_t max_available_extent_show(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev);
unsigned long long available = 0;
+ nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
available = nd_region_allocatable_dpa(nd_region);
nvdimm_bus_unlock(dev);
+ nd_device_unlock(dev);
return sprintf(buf, "%llu\n", available);
}
@@ -561,12 +565,12 @@ static ssize_t region_badblocks_show(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev);
ssize_t rc;
- device_lock(dev);
+ nd_device_lock(dev);
if (dev->driver)
rc = badblocks_show(&nd_region->bb, buf, 0);
else
rc = -ENXIO;
- device_unlock(dev);
+ nd_device_unlock(dev);
return rc;
}