s390/dasd: fix endless loop after read unit address configuration

After getting a storage server event that causes the DASD device driver
to update its unit address configuration during a device shutdown there is
the possibility of an endless loop in the device driver.

In the system log there will be ongoing DASD error messages with RC: -19.

The reason is that the loop starting the ruac request only terminates when
the retry counter is decreased to 0. But in the sleep_on function there are
early exit paths that do not decrease the retry counter.

Prevent an endless loop by handling those cases separately.

Remove the unnecessary do..while loop since the sleep_on function takes
care of retries by itself.

Fixes: 8e09f21574ea ("[S390] dasd: add hyper PAV support to DASD device driver, part 1")
Cc: stable@vger.kernel.org # 2.6.25+
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>

diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c
index b9ce93e9df89295eb72132fcfc81d0257aaa1723..99f86612f7751ad6d47b7abee8661e8deec2b0b2 100644 (file)
--- a/drivers/s390/block/dasd_alias.c
+++ b/drivers/s390/block/dasd_alias.c
@@ -383,6 +383,20 @@ suborder_not_supported(struct dasd_ccw_req *cqr)
        char msg_format;
        char msg_no;
 
+       /*
+        * intrc values ENODEV, ENOLINK and EPERM
+        * will be optained from sleep_on to indicate that no
+        * IO operation can be started
+        */
+       if (cqr->intrc == -ENODEV)
+               return 1;
+
+       if (cqr->intrc == -ENOLINK)
+               return 1;
+
+       if (cqr->intrc == -EPERM)
+               return 1;
+
        sense = dasd_get_sense(&cqr->irb);
        if (!sense)
                return 0;
@@ -447,12 +461,8 @@ static int read_unit_address_configuration(struct dasd_device *device,
        lcu->flags &= ~NEED_UAC_UPDATE;
        spin_unlock_irqrestore(&lcu->lock, flags);
 
-       do {
-               rc = dasd_sleep_on(cqr);
-               if (rc && suborder_not_supported(cqr))
-                       return -EOPNOTSUPP;
-       } while (rc && (cqr->retries > 0));
-       if (rc) {
+       rc = dasd_sleep_on(cqr);
+       if (rc && !suborder_not_supported(cqr)) {
                spin_lock_irqsave(&lcu->lock, flags);
                lcu->flags |= NEED_UAC_UPDATE;
                spin_unlock_irqrestore(&lcu->lock, flags);