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| author | Dan Williams <dan.j.williams@intel.com> | 2018-04-02 16:40:04 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2018-04-03 11:51:42 -0700 |
| commit | 78727137fdf49edf9f731bde79d7189067b4047a (patch) | |
| tree | 9a16e2d9c3082c241c7055b0fcacac2ba6e6017e | |
| parent | 8d0d8ed3356aa9ed43b819aaedd39b08ca453007 (diff) | |
| download | linux-rpi-78727137fdf49edf9f731bde79d7189067b4047a.tar.gz linux-rpi-78727137fdf49edf9f731bde79d7189067b4047a.tar.bz2 linux-rpi-78727137fdf49edf9f731bde79d7189067b4047a.zip | |
nfit, address-range-scrub: fix scrub in-progress reporting
There is a small window whereby ARS scan requests can schedule work that
userspace will miss when polling scrub_show. Hold the init_mutex lock
over calls to report the status to close this potential escape. Also,
make sure that requests to cancel the ARS workqueue are treated as an
idle event.
Cc: <stable@vger.kernel.org>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Fixes: 37b137ff8c83 ("nfit, libnvdimm: allow an ARS scrub...")
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
| -rw-r--r-- | drivers/acpi/nfit/core.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index ea9f3e727fef..2a1fc3817a81 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -1249,8 +1249,11 @@ static ssize_t scrub_show(struct device *dev, if (nd_desc) { struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc); + mutex_lock(&acpi_desc->init_mutex); rc = sprintf(buf, "%d%s", acpi_desc->scrub_count, - (work_busy(&acpi_desc->work)) ? "+\n" : "\n"); + work_busy(&acpi_desc->work) + && !acpi_desc->cancel ? "+\n" : "\n"); + mutex_unlock(&acpi_desc->init_mutex); } device_unlock(dev); return rc; |