The adapter->vfs_lock currently protects critical sections shared between igb_disable_sriov() and igb_msg_task(). Since igb_msg_task() — which is invoked solely by the igb_msix_other() ISR—only proceeds when adapter->vfs_allocated_count > 0, we can reduce the lock scope further.
By moving the assignment adapter->vfs_allocated_count = 0 to the start of the cleanup code in igb_disable_sriov(), we can restrict the spinlock protection solely to this assignment. This change removes kfree() calls from within the locked section, simplifying lock management. Once kfree() is outside the vfs_lock scope, it becomes possible to safely convert vfs_lock to a raw_spin_lock. Signed-off-by: Wander Lairson Costa <[email protected]> --- drivers/net/ethernet/intel/igb/igb_main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 08578980b6518..4ca25660e876e 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -3708,12 +3708,12 @@ static int igb_disable_sriov(struct pci_dev *pdev, bool reinit) msleep(500); } spin_lock_irqsave(&adapter->vfs_lock, flags); + adapter->vfs_allocated_count = 0; + spin_unlock_irqrestore(&adapter->vfs_lock, flags); kfree(adapter->vf_mac_list); adapter->vf_mac_list = NULL; kfree(adapter->vf_data); adapter->vf_data = NULL; - adapter->vfs_allocated_count = 0; - spin_unlock_irqrestore(&adapter->vfs_lock, flags); wr32(E1000_IOVCTL, E1000_IOVCTL_REUSE_VFQ); wrfl(); msleep(100); -- 2.47.0
