From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Peter Oberparleiter , Sebastian Ott , Martin Schwidefsky Subject: [ 014/221] s390/cio: fix pgid reserved check Date: Tue, 15 Jan 2013 10:49:01 -0800 Message-Id: <20130115184959.080973647@linuxfoundation.org> In-Reply-To: <20130115184958.025580322@linuxfoundation.org> References: <20130115184958.025580322@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sebastian Ott commit d99e79ec5574fc556c988f613ed6175f6de66f4a upstream. 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. Acked-by: Peter Oberparleiter Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- drivers/s390/cio/device_pgid.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) --- 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, str * 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_devi if ((cdev->private->pgid_valid_mask & lpm) == 0) continue; if (pgid->inf.ps.state2 == SNID_STATE2_RESVD_ELSE) - *reserved = 1; + *reserved |= lpm; if (pgid_is_reset(pgid)) { *reset |= lpm; continue; @@ -316,14 +316,14 @@ static void snid_done(struct ccw_device 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) rc = -EOPNOTSUPP; @@ -336,7 +336,7 @@ static void snid_done(struct ccw_device } out: 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) {