Stuart Hayes 4d2bc69df9 PCI/portdrv: Enable Bandwidth Notification only if port supports it ... commit 00823dcbdd upstream. Previously we assumed that all Root Ports and Switch Downstream Ports supported Link Bandwidth Notification. Per spec, this is only required for Ports supporting Links wider than x1 and/or multiple Link speeds (PCIe r5.0, sec 7.5.3.6). Because we assumed all Ports supported it, we tried to set up a Bandwidth Notification IRQ, which failed for devices that don't support IRQs at all, which meant pcieport didn't attach to the Port at all. Check the Link Bandwidth Notification Capability bit and enable the service only when the Port supports it. [bhelgaas: commit log] Fixes: e8303bb7a7 ("PCI/LINK: Report degraded links via link bandwidth notification") Link: https://lore.kernel.org/r/20210512213314.7778-1-stuart.w.hayes@gmail.com Signed-off-by: Stuart Hayes <stuart.w.hayes@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Lukas Wunner <lukas@wunner.de> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-09-22 12:26:22 +02:00
..
aer.c
aer_inject.c
aspm.c	PCI/ASPM: Add missing newline in sysfs 'policy'	2020-08-19 08:16:13 +02:00
bw_notification.c
dpc.c
err.c
Kconfig
Makefile
pme.c
portdrv.h
portdrv_core.c	PCI/portdrv: Enable Bandwidth Notification only if port supports it	2021-09-22 12:26:22 +02:00
portdrv_pci.c
ptm.c	PCI/PTM: Inherit Switch Downstream Port PTM settings from Upstream Port	2020-06-24 17:50:31 +02:00