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acpi, nfit: check for the correct event code in notifications

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commit c09f12186d6b03b798832d95289af76495990192 upstream.

Commit 209851649d "acpi: nfit: Add support for hot-add" added
support for _FIT notifications, but it neglected to verify the
notification event code matches the one in the ACPI spec for
"NFIT Update". Currently there is only one code in the spec, but
once additional codes are added, older kernels (without this fix)
will misbehave by assuming all event notifications are for an
NFIT Update.

Fixes: 209851649d ("acpi: nfit: Add support for hot-add")
Cc: <stable@vger.kernel.org>
Cc: <linux-acpi@vger.kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Reported-by: Linda Knippers <linda.knippers@hpe.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vishal Verma 2016-08-19 14:40:58 -06:00 • committed by Greg Kroah-Hartman
parent 70c66946ef
commit 74688ce499
2 changed files with 7 additions and 0 deletions
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3
drivers/acpi/nfit.c
View file

@ -1806,6 +1806,9 @@ static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
dev_dbg(dev, "%s: event: %d\n", __func__, event);
if (event != NFIT_NOTIFY_UPDATE)
return;
device_lock(dev);
if (!dev->driver) {
/* dev->driver may be null if we're being removed */

4
drivers/acpi/nfit.h
View file

@ -45,6 +45,10 @@ enum {
ND_BLK_DCR_LATCH = 2,
};
enum nfit_root_notifiers {
NFIT_NOTIFY_UPDATE = 0x80,
};
struct nfit_spa {
struct acpi_nfit_system_address *spa;
struct list_head list;