sata_mv: safer logic for limit_warnings

There is a miniscule chance that two separate host controllers
might be in sata_mv at the same time and manage to decrement
the static limit_warnings variable below zero.

Fix the comparison to deal with it.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 28092bc..ad169ff 100644 (file)
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -1607,7 +1607,7 @@ static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
                 * Much of the time, this could just work regardless.
                 * So for now, just log the incident, and allow the attempt.
                 */
-               if (limit_warnings && (qc->nbytes / qc->sect_size) > 1) {
+               if (limit_warnings > 0 && (qc->nbytes / qc->sect_size) > 1) {
                        --limit_warnings;
                        ata_link_printk(qc->dev->link, KERN_WARNING, DRV_NAME
                                        ": attempting PIO w/multiple DRQ: "