path: root/drivers/s390/cio
diff options
authorSebastian Ott <sebott@linux.vnet.ibm.com>2012-11-30 16:48:59 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-12-03 10:43:58 -0500
commitd99e79ec5574fc556c988f613ed6175f6de66f4a (patch)
tree50657d29de857267b5fe5cacc5b240d0275dc05c /drivers/s390/cio
parent1150f25441a7dad818fa4366d01c45c2fef1cbe8 (diff)
s390/cio: fix pgid reserved check
The check to whom a device is reserved is done by checking the path state of the affected channel paths. If it turns out that one path is flagged as reserved by someone else the whole device is marked as such. However the meaning of the RESVD_ELSE bit is that the addressed device is reserved to a different pathgroup (and not reserved to a different LPAR). If we do this test on a path which is currently not a member of the pathgroup we could erroneously mark the device as reserved to someone else. To fix this collect the reserved state for all potential members of the pathgroup and only mark the device as reserved if all of those potential members have the RESVD_ELSE bit set. Cc: stable@vger.kernel.org Acked-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio')
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index 368368fe04b..908d287f66c 100644
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -234,7 +234,7 @@ static int pgid_cmp(struct pgid *p1, struct pgid *p2)
* Determine pathgroup state from PGID data.
static void pgid_analyze(struct ccw_device *cdev, struct pgid **p,
- int *mismatch, int *reserved, u8 *reset)
+ int *mismatch, u8 *reserved, u8 *reset)
struct pgid *pgid = &cdev->private->pgid[0];
struct pgid *first = NULL;
@@ -248,7 +248,7 @@ static void pgid_analyze(struct ccw_device *cdev, struct pgid **p,
if ((cdev->private->pgid_valid_mask & lpm) == 0)
if (pgid->inf.ps.state2 == SNID_STATE2_RESVD_ELSE)
- *reserved = 1;
+ *reserved |= lpm;
if (pgid_is_reset(pgid)) {
*reset |= lpm;
@@ -316,14 +316,14 @@ static void snid_done(struct ccw_device *cdev, int rc)
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct pgid *pgid;
int mismatch = 0;
- int reserved = 0;
+ u8 reserved = 0;
u8 reset = 0;
u8 donepm;
if (rc)
goto out;
pgid_analyze(cdev, &pgid, &mismatch, &reserved, &reset);
- if (reserved)
+ if (reserved == cdev->private->pgid_valid_mask)
rc = -EUSERS;
else if (mismatch)
@@ -336,7 +336,7 @@ static void snid_done(struct ccw_device *cdev, int rc)
CIO_MSG_EVENT(2, "snid: device 0.%x.%04x: rc=%d pvm=%02x vpm=%02x "
- "todo=%02x mism=%d rsvd=%d reset=%02x\n", id->ssid,
+ "todo=%02x mism=%d rsvd=%02x reset=%02x\n", id->ssid,
id->devno, rc, cdev->private->pgid_valid_mask, sch->vpm,
cdev->private->pgid_todo_mask, mismatch, reserved, reset);
switch (rc) {