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staging: unisys: prevent faults processing messages

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Prevent faults processing messages for devices that no driver has yet
registered to handle.

Previously, code of the form:

    drv = to_visor_driver(dev->device.driver);
    if (!drv)
        goto away;

was not having the desired intent, because to_visor_driver() was
essentially returning garbage if its argument was NULL.  The only existing
case of this is in initiate_chipset_device_pause_resume(), which is called
during IOVM service partition recovery.  We were thus faulting when IOVM
service partition recovery was initiated on a bus that had at least one
device for which no function driver had registered
(visorbus_register_visor_driver).

Signed-off-by: Tim Sell <Timothy.Sell@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tim Sell 2015-07-09 13:27:42 -04:00 • committed by Greg Kroah-Hartman
commit d15a65be55
1 changed files with 2 additions and 1 deletions
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3
drivers/staging/unisys/include/visorbus.h
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@ -113,7 +113,8 @@ struct visor_driver {
struct driver_attribute version_attr;
};
#define to_visor_driver(x) container_of(x, struct visor_driver, driver)
#define to_visor_driver(x) ((x) ? \
(container_of(x, struct visor_driver, driver)) : (NULL))
/** A device type for things "plugged" into the visorbus bus */