summaryrefslogtreecommitdiffstats
path: root/drivers/s390
diff options
context:
space:
mode:
authorStefan Haberland <sth@linux.ibm.com>2020-12-17 16:59:05 +0100
committerJens Axboe <axboe@kernel.dk>2020-12-17 13:41:29 -0700
commita29ea01653493b94ea12bb2b89d1564a265081b6 (patch)
treea4c90bd9b8d56425a00431edcc8ebe17eaae177a /drivers/s390
parent658a337a606f48b7ebe451591f7681d383fa115e (diff)
downloadlinux-a29ea01653493b94ea12bb2b89d1564a265081b6.tar.bz2
s390/dasd: prevent inconsistent LCU device data
Prevent _lcu_update from adding a device to a pavgroup if the LCU still requires an update. The data is not reliable any longer and in parallel devices might have been moved on the lists already. This might lead to list corruptions or invalid PAV grouping. Only add devices to a pavgroup if the LCU is up to date. Additional steps are taken by the scheduled lcu update. Fixes: 8e09f21574ea ("[S390] dasd: add hyper PAV support to DASD device driver, part 1") Cc: stable@vger.kernel.org Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/block/dasd_alias.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c
index 31e8b5d48e86..f841518de6c5 100644
--- a/drivers/s390/block/dasd_alias.c
+++ b/drivers/s390/block/dasd_alias.c
@@ -511,6 +511,14 @@ static int _lcu_update(struct dasd_device *refdev, struct alias_lcu *lcu)
return rc;
spin_lock_irqsave(&lcu->lock, flags);
+ /*
+ * there is another update needed skip the remaining handling
+ * the data might already be outdated
+ * but especially do not add the device to an LCU with pending
+ * update
+ */
+ if (lcu->flags & NEED_UAC_UPDATE)
+ goto out;
lcu->pav = NO_PAV;
for (i = 0; i < MAX_DEVICES_PER_LCU; ++i) {
switch (lcu->uac->unit[i].ua_type) {
@@ -529,6 +537,7 @@ static int _lcu_update(struct dasd_device *refdev, struct alias_lcu *lcu)
alias_list) {
_add_device_to_lcu(lcu, device, refdev);
}
+out:
spin_unlock_irqrestore(&lcu->lock, flags);
return 0;
}