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| author | Michael Holzheu <holzheu@de.ibm.com> | 2007-08-10 14:32:33 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-08-10 14:32:38 +0200 |
| commit | 4eac34529bce2b4cca9be90a6903c965baa8193c (patch) | |
| tree | 2a0d04aa4ed5b9c2d9a75158c6c0715456443e5f /drivers/s390/char/vmur.c | |
| parent | f2405598e0678e9c93dd780f2a12fc562ece3d13 (diff) | |
| download | linux-stable-4eac34529bce2b4cca9be90a6903c965baa8193c.tar.gz linux-stable-4eac34529bce2b4cca9be90a6903c965baa8193c.tar.bz2 linux-stable-4eac34529bce2b4cca9be90a6903c965baa8193c.zip | |
[S390] vmur: add "top of queue" sanity check for reader open
If the z/VM reader is already open, it can happen that after opening the
Linux reader device, not the topmost file is processed. According the
semantics of the Linux z/VM unit record device driver, always the topmost
file has to be processed. With this fix an error is returned if that is
not the case.
Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char/vmur.c')
| -rw-r--r-- | drivers/s390/char/vmur.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/s390/char/vmur.c b/drivers/s390/char/vmur.c index 04395c0f99d8..a9d58629e795 100644 --- a/drivers/s390/char/vmur.c +++ b/drivers/s390/char/vmur.c @@ -565,9 +565,14 @@ static int verify_device(struct urdev *urd) return -ENOMEM; rc = diag_read_file(urd->dev_id.devno, buf); kfree(buf); - if ((rc != 0) && (rc != -ENODATA)) /* EOF does not hurt */ return rc; + /* check if the file on top of the queue is open now */ + rc = diag_read_next_file_info(&fcb, 0); + if (rc) + return rc; + if (!(fcb.file_stat & FLG_IN_USE)) + return -EMFILE; return 0; default: return -ENOTSUPP; |