PCI: endpoint: pci-ep-msi: Let non-first EPFs use embedded doorbells

pci_epf_alloc_doorbell() rejects every EPF that is not the first one
attached to the EPC because the MSI-backed path can populate doorbell
messages only for that EPF. This also prevents non-first EPFs from using
the embedded doorbell backend.

Keep the MSI-backed path limited to the first attached EPF. Let
non-first EPFs skip it and try the embedded doorbell directly. The
embedded IRQ is exclusive, so a second embedded user fails to request
the IRQ instead of receiving another EPF's notifications.

Signed-off-by: Koichiro Den <den@valinux.co.jp>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260728172306.2751813-4-den@valinux.co.jp

0 files changed, 0 insertions, 0 deletions