s390/cio: check the subchannel validity for dev_busid
Check the validity of subchanel before reading other fields in
the schib.
Fixes: d3683c0552
("s390/cio: add dev_busid sysfs entry for each subchannel")
CC: <stable@vger.kernel.org>
Reported-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Link: https://lore.kernel.org/r/20211105154451.847288-1-vneethv@linux.ibm.com
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
parent
9d48c7afed
commit
a4751f157c
@ -437,8 +437,8 @@ static ssize_t dev_busid_show(struct device *dev,
|
||||
struct subchannel *sch = to_subchannel(dev);
|
||||
struct pmcw *pmcw = &sch->schib.pmcw;
|
||||
|
||||
if ((pmcw->st == SUBCHANNEL_TYPE_IO ||
|
||||
pmcw->st == SUBCHANNEL_TYPE_MSG) && pmcw->dnv)
|
||||
if ((pmcw->st == SUBCHANNEL_TYPE_IO && pmcw->dnv) ||
|
||||
(pmcw->st == SUBCHANNEL_TYPE_MSG && pmcw->w))
|
||||
return sysfs_emit(buf, "0.%x.%04x\n", sch->schid.ssid,
|
||||
pmcw->dev);
|
||||
else
|
||||
|
Loading…
Reference in New Issue
Block a user