diff options
| -rw-r--r-- | drivers/pci/endpoint/pci-ep-msi.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pci/endpoint/pci-ep-msi.c b/drivers/pci/endpoint/pci-ep-msi.c index 51c19942a81e..1395919571f8 100644 --- a/drivers/pci/endpoint/pci-ep-msi.c +++ b/drivers/pci/endpoint/pci-ep-msi.c @@ -50,6 +50,9 @@ int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 num_db) return -EINVAL; } + if (epf->db_msg) + return -EBUSY; + domain = of_msi_map_get_device_domain(epc->dev.parent, 0, DOMAIN_BUS_PLATFORM_MSI); if (!domain) { @@ -79,6 +82,8 @@ int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 num_db) if (ret) { dev_err(dev, "Failed to allocate MSI\n"); kfree(msg); + epf->db_msg = NULL; + epf->num_db = 0; return ret; } |