diff options
| author | Dexuan Cui <decui@microsoft.com> | 2018-03-15 17:22:00 +0300 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2018-03-16 21:19:03 +0300 |
| commit | 948373b3ed1bcf05a237c24675b84804315aff14 (patch) | |
| tree | 3a430eb260acb32104a68197d127c9ccd01c46b6 /drivers/pci/host | |
| parent | fca288c0153b2b97114b9081bc3c33c3735145b6 (diff) | |
| download | linux-948373b3ed1bcf05a237c24675b84804315aff14.tar.xz | |
PCI: hv: Only queue new work items in hv_pci_devices_present() if necessary
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>
Diffstat (limited to 'drivers/pci/host')
| -rw-r--r-- | drivers/pci/host/pci-hyperv.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c index 0dc2ecdbbe45..50cdefe3f6d3 100644 --- a/drivers/pci/host/pci-hyperv.c +++ b/drivers/pci/host/pci-hyperv.c @@ -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); + } } /** |