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authorDan Williams <dan.j.williams@intel.com>2016-08-10 15:59:09 -0700
committerDan Williams <dan.j.williams@intel.com>2016-08-10 15:59:09 -0700
commitd8d378fa1a0c98ecb50ca52c9bf3bc14e25aa2d2 (patch)
tree994dc6ed68207acf10bbbe35dbf61da02ac870e2 /tools
parentabe8b4e3cef88b8202641d63f5ad58141b970b0f (diff)
downloadlinux-stericsson-d8d378fa1a0c98ecb50ca52c9bf3bc14e25aa2d2.tar.gz
tools/testing/nvdimm: fix SIGTERM vs hotplug crash
The unit tests crash when hotplug races the previous probe. This race requires that the loading of the nfit_test module be terminated with SIGTERM, and the module to be unloaded while the ars scan is still running. In contrast to the normal nfit driver, the unit test calls acpi_nfit_init() twice to simulate hotplug, whereas the nominal case goes through the acpi_nfit_notify() event handler. The acpi_nfit_notify() path is careful to flush the previous region registration before servicing the hotplug event. The unit test was missing this guarantee. BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff810cdce7>] pwq_activate_delayed_work+0x47/0x170 [..] Call Trace: [<ffffffff810ce186>] pwq_dec_nr_in_flight+0x66/0xa0 [<ffffffff810ce490>] process_one_work+0x2d0/0x680 [<ffffffff810ce331>] ? process_one_work+0x171/0x680 [<ffffffff810ce88e>] worker_thread+0x4e/0x480 [<ffffffff810ce840>] ? process_one_work+0x680/0x680 [<ffffffff810ce840>] ? process_one_work+0x680/0x680 [<ffffffff810d5343>] kthread+0xf3/0x110 [<ffffffff8199846f>] ret_from_fork+0x1f/0x40 [<ffffffff810d5250>] ? kthread_create_on_node+0x230/0x230 Cc: <stable@vger.kernel.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/nvdimm/test/nfit.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index 5404efa578a3..dd48f421844c 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -13,6 +13,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
+#include <linux/workqueue.h>
#include <linux/libnvdimm.h>
#include <linux/vmalloc.h>
#include <linux/device.h>
@@ -1474,6 +1475,7 @@ static int nfit_test_probe(struct platform_device *pdev)
if (nfit_test->setup != nfit_test0_setup)
return 0;
+ flush_work(&acpi_desc->work);
nfit_test->setup_hotplug = 1;
nfit_test->setup(nfit_test);