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, 4 insertions, 38 deletions

diff --git a/drivers/cxl/core/pmem.c b/drivers/cxl/core/pmem.c
index f3d2169b6731..c2e4b1093788 100644
--- a/drivers/cxl/core/pmem.c
+++ b/drivers/cxl/core/pmem.c
@@ -227,34 +227,16 @@ static struct cxl_nvdimm *cxl_nvdimm_alloc(struct cxl_nvdimm_bridge *cxl_nvb,
 	return cxl_nvd;
 }
 
-static void cxl_nvd_unregister(void *_cxl_nvd)
+static void cxlmd_release_nvdimm(void *_cxlmd)
 {
-	struct cxl_nvdimm *cxl_nvd = _cxl_nvd;
-	struct cxl_memdev *cxlmd = cxl_nvd->cxlmd;
+	struct cxl_memdev *cxlmd = _cxlmd;
+	struct cxl_nvdimm *cxl_nvd = cxlmd->cxl_nvd;
 	struct cxl_nvdimm_bridge *cxl_nvb = cxlmd->cxl_nvb;
 
-	/*
-	 * Either the bridge is in ->remove() context under the device_lock(),
-	 * or cxlmd_release_nvdimm() is cancelling the bridge's release action
-	 * for @cxl_nvd and doing it itself (while manually holding the bridge
-	 * lock).
-	 */
-	device_lock_assert(&cxl_nvb->dev);
 	cxl_nvd->cxlmd = NULL;
 	cxlmd->cxl_nvd = NULL;
+	cxlmd->cxl_nvb = NULL;
 	device_unregister(&cxl_nvd->dev);
-}
-
-static void cxlmd_release_nvdimm(void *_cxlmd)
-{
-	struct cxl_memdev *cxlmd = _cxlmd;
-	struct cxl_nvdimm_bridge *cxl_nvb = cxlmd->cxl_nvb;
-
-	device_lock(&cxl_nvb->dev);
-	if (cxlmd->cxl_nvd)
-		devm_release_action(&cxl_nvb->dev, cxl_nvd_unregister,
-				    cxlmd->cxl_nvd);
-	device_unlock(&cxl_nvb->dev);
 	put_device(&cxl_nvb->dev);
 }
 
@@ -293,22 +275,6 @@ int devm_cxl_add_nvdimm(struct cxl_memdev *cxlmd)
 
 	dev_dbg(&cxlmd->dev, "register %s\n", dev_name(dev));
 
-	/*
-	 * The two actions below arrange for @cxl_nvd to be deleted when either
-	 * the top-level PMEM bridge goes down, or the endpoint device goes
-	 * through ->remove().
-	 */
-	device_lock(&cxl_nvb->dev);
-	if (cxl_nvb->dev.driver)
-		rc = devm_add_action_or_reset(&cxl_nvb->dev, cxl_nvd_unregister,
-					      cxl_nvd);
-	else
-		rc = -ENXIO;
-	device_unlock(&cxl_nvb->dev);
-
-	if (rc)
-		goto err_alloc;
-
 	/* @cxlmd carries a reference on @cxl_nvb until cxlmd_release_nvdimm */
 	return devm_add_action_or_reset(&cxlmd->dev, cxlmd_release_nvdimm, cxlmd);