Merge tag 'cxl-fixes-for-6.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl

Pull cxl fixes from Dan Williams:
 "A couple of fixes for bugs introduced during the merge window. One is
  a regression, the other was a bug in the CXL AER handler:

   - Fix a crash regression due to module load order of cxl_pmem.ko

   - Fix wrong register offset read in CXL AER handling path"

* tag 'cxl-fixes-for-6.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl:
  cxl/pmem: Fix nvdimm unregistration when cxl_pmem driver is absent
  cxl: fix cxl_report_and_clear() RAS UE addr mis-assignment

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
index eedefebc4283..08bbbac9a6d0 100644
--- a/drivers/cxl/pmem.c
+++ b/drivers/cxl/pmem.c
@@ -225,11 +225,35 @@ static int cxl_pmem_ctl(struct nvdimm_bus_descriptor *nd_desc,
 	return cxl_pmem_nvdimm_ctl(nvdimm, cmd, buf, buf_len);
 }
 
+static int detach_nvdimm(struct device *dev, void *data)
+{
+	struct cxl_nvdimm *cxl_nvd;
+	bool release = false;
+
+	if (!is_cxl_nvdimm(dev))
+		return 0;
+
+	device_lock(dev);
+	if (!dev->driver)
+		goto out;
+
+	cxl_nvd = to_cxl_nvdimm(dev);
+	if (cxl_nvd->cxlmd && cxl_nvd->cxlmd->cxl_nvb == data)
+		release = true;
+out:
+	device_unlock(dev);
+	if (release)
+		device_release_driver(dev);
+	return 0;
+}
+
 static void unregister_nvdimm_bus(void *_cxl_nvb)
 {
 	struct cxl_nvdimm_bridge *cxl_nvb = _cxl_nvb;
 	struct nvdimm_bus *nvdimm_bus = cxl_nvb->nvdimm_bus;
 
+	bus_for_each_dev(&cxl_bus_type, NULL, cxl_nvb, detach_nvdimm);
+
 	cxl_nvb->nvdimm_bus = NULL;
 	nvdimm_bus_unregister(nvdimm_bus);
 }