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authorVineeth Vijayan <vneethv@linux.ibm.com>2021-11-05 18:44:51 +0300
committerVasily Gorbik <gor@linux.ibm.com>2021-11-08 16:17:49 +0300
commita4751f157c194431fae9e9c493f456df8272b871 (patch)
treecd75c67830300d722dd8edb8223a23edac7a6e82 /drivers/s390
parent9d48c7afedf91a02d03295837ec76b2fb5e7d3fe (diff)
downloadlinux-a4751f157c194431fae9e9c493f456df8272b871.tar.xz
s390/cio: check the subchannel validity for dev_busid
Check the validity of subchanel before reading other fields in the schib. Fixes: d3683c055212 ("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>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/css.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 2bc55ccf3f23..ce9e7517430f 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -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