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| author | Elias Oltmanns <eo@nebensachen.de> | 2008-11-03 19:01:08 +0900 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-11-04 01:08:24 -0500 |
| commit | a464189de350b050aa8f334bd4cc53ed406e56dd (patch) | |
| tree | d4acc5c1f65eca5522bbd28ae2702e54a1f8db0a | |
| parent | 3c324283e6cdb79210cf7975c3e40d3ba3e672b2 (diff) | |
| download | op-kernel-dev-a464189de350b050aa8f334bd4cc53ed406e56dd.zip op-kernel-dev-a464189de350b050aa8f334bd4cc53ed406e56dd.tar.gz | |
libata: Fix a potential race condition in ata_scsi_park_show()
Peter Moulder has pointed out that there is a slight chance that a
negative value might be passed to jiffies_to_msecs() in
ata_scsi_park_show(). This is fixed by saving the value of jiffies in a
local variable, thus also reducing code since the volatile variable
jiffies is accessed only once.
Signed-off-by: Elias Oltmanns <eo@nebensachen.de>
Signed-off-by: Tejun Heo <tj.kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
| -rw-r--r-- | drivers/ata/libata-scsi.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index bbb30d8..3fa75ea 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -190,7 +190,7 @@ static ssize_t ata_scsi_park_show(struct device *device, struct ata_port *ap; struct ata_link *link; struct ata_device *dev; - unsigned long flags; + unsigned long flags, now; unsigned int uninitialized_var(msecs); int rc = 0; @@ -208,10 +208,11 @@ static ssize_t ata_scsi_park_show(struct device *device, } link = dev->link; + now = jiffies; if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && link->eh_context.unloaded_mask & (1 << dev->devno) && - time_after(dev->unpark_deadline, jiffies)) - msecs = jiffies_to_msecs(dev->unpark_deadline - jiffies); + time_after(dev->unpark_deadline, now)) + msecs = jiffies_to_msecs(dev->unpark_deadline - now); else msecs = 0; |
