acpi, nfit: fix health event notification

Integration testing with a BIOS that generates injected health event
notifications fails to communicate those events to userspace. The nfit
driver neglects to link the ACPI DIMM device with the necessary driver
data so acpi_nvdimm_notify() fails this lookup:

        nfit_mem = dev_get_drvdata(dev);
        if (nfit_mem && nfit_mem->flags_attr)
                sysfs_notify_dirent(nfit_mem->flags_attr);

Add the necessary linkage when installing the notification handler and
clean it up when the nfit driver instance is torn down.

Cc: <stable@vger.kernel.org>
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Fixes: ba9c8dd3c222 ("acpi, nfit: add dimm device notification support")
Reported-by: Daniel Osawa <daniel.k.osawa@intel.com>
Tested-by: Daniel Osawa <daniel.k.osawa@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index ff2580e7611d18c6d56c58d50c2cbc3a2d54aa36..abeb4df4f22e43d7f0d1398af9962135a37af4b6 100644 (file)
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1670,6 +1670,11 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
                                dev_name(&adev_dimm->dev));
                return -ENXIO;
        }
+       /*
+        * Record nfit_mem for the notification path to track back to
+        * the nfit sysfs attributes for this dimm device object.
+        */
+       dev_set_drvdata(&adev_dimm->dev, nfit_mem);
 
        /*
         * Until standardization materializes we need to consider 4
@@ -1752,9 +1757,11 @@ static void shutdown_dimm_notify(void *data)
                        sysfs_put(nfit_mem->flags_attr);
                        nfit_mem->flags_attr = NULL;
                }
-               if (adev_dimm)
+               if (adev_dimm) {
                        acpi_remove_notify_handler(adev_dimm->handle,
                                        ACPI_DEVICE_NOTIFY, acpi_nvdimm_notify);
+                       dev_set_drvdata(&adev_dimm->dev, NULL);
+               }
        }
        mutex_unlock(&acpi_desc->init_mutex);
 }