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authorVineeth Vijayan <[email protected]>2022-02-02 21:45:56 +0100
committerVasily Gorbik <[email protected]>2022-02-09 22:55:01 +0100
commitdd9cb842fa9d90653a9b48aba52f89c069f3bc50 (patch)
tree84919f73f28005929259e1dce46818c64d3ae55b
parente286f231eab410793f3e91c924e6dbd23edee05a (diff)
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: 32ef938815c1 ("s390/cio: Add support for FCES status notification") Cc: [email protected] Signed-off-by: Vineeth Vijayan <[email protected]> Suggested-by: Peter Oberparleiter <[email protected]> Reviewed-by: Jan Hoeppner <[email protected]> Reviewed-by: Peter Oberparleiter <[email protected]> Signed-off-by: Vasily Gorbik <[email protected]>
-rw-r--r--drivers/s390/cio/device.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index cd938a26b76c..3b1cd0c96a74 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -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;
}