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iommufd: Balance veventq->num_events inc/dec

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iommufd_veventq_fops_read() decrements veventq->num_events when a vevent
is read out. However, the report path ony increments veventq->num_events
for normal events. To be balanced, make the read path decrement num_events
only for normal vevents.

Fixes: e36ba5ab80 ("iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC")
Link: https://patch.msgid.link/r/20250324120034.5940-3-yi.l.liu@intel.com
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Yi Liu 2025-03-24 05:00:34 -07:00 committed by Jason Gunthorpe
parent 41464a4628
commit 6fc85bbbea
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/iommufd/eventq.c
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@ -385,7 +385,8 @@ static ssize_t iommufd_veventq_fops_read(struct file *filep, char __user *buf,
break;
}
spin_lock(&eventq->lock);
veventq->num_events--;
if (!vevent_for_lost_events_header(cur))
veventq->num_events--;
spin_unlock(&eventq->lock);
done += cur->data_len;
kfree(cur);