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s390/cio: verify the driver availability for path_event call 

If no driver is attached to a device or the driver does not provide the
path_event function, an FCES path-event on this device could end up in a
kernel-panic. Verify the driver availability before the path_event
function call.

Fixes: 32ef938815 ("s390/cio: Add support for FCES status notification")
Cc: stable@vger.kernel.org
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Suggested-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vineeth Vijayan 2022-02-02 21:45:56 +01:00 committed by Vasily Gorbik
parent e286f231ea
commit dd9cb842fa
1 changed files with 1 additions and 1 deletions
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2
drivers/s390/cio/device.c
View File

@ -1180,7 +1180,7 @@ static int io_subchannel_chp_event(struct subchannel *sch,
else
path_event[chpid] = PE_NONE;
}
if (cdev)
if (cdev && cdev->drv && cdev->drv->path_event)
cdev->drv->path_event(cdev, path_event);
break;
}