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PCI: hv: Only queue new work items in hv_pci_devices_present() if necessary

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If there is pending work in hv_pci_devices_present() we just need to add
the new dr entry into the dr_list. Add a check to detect pending work
items and update the code to skip queuing work if pending work items
are detected.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Acked-by: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Jack Morgenstein <jackm@mellanox.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
This commit is contained in:
Dexuan Cui 2018-03-15 14:22:00 +00:00 committed by Lorenzo Pieralisi
parent fca288c015
commit 948373b3ed
1 changed files with 13 additions and 2 deletions
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15
drivers/pci/host/pci-hyperv.c
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@ -1789,6 +1789,7 @@ static void hv_pci_devices_present(struct hv_pcibus_device *hbus,
struct hv_dr_state *dr;
struct hv_dr_work *dr_wrk;
unsigned long flags;
bool pending_dr;
dr_wrk = kzalloc(sizeof(*dr_wrk), GFP_NOWAIT);
if (!dr_wrk)
@ -1812,11 +1813,21 @@ static void hv_pci_devices_present(struct hv_pcibus_device *hbus,
}
spin_lock_irqsave(&hbus->device_list_lock, flags);
/*
* If pending_dr is true, we have already queued a work,
* which will see the new dr. Otherwise, we need to
* queue a new work.
*/
pending_dr = !list_empty(&hbus->dr_list);
list_add_tail(&dr->list_entry, &hbus->dr_list);
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
get_hvpcibus(hbus);
queue_work(hbus->wq, &dr_wrk->wrk);
if (pending_dr) {
kfree(dr_wrk);
} else {
get_hvpcibus(hbus);
queue_work(hbus->wq, &dr_wrk->wrk);
}
}
/**