lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 07 Nov 2014 15:54:41 -0700
From:	Alex Williamson <>
Subject: [PATCH] PCI: pciehp: Flush slot control prior to reset

Since 3461a068661c we don't automatically do a pcie_wait_cmd() for
as part of pcie_write_cmd(), it needs to be called explicitly or
triggered by the next pcie_write_cmd().  However, when we do a
secondary bus reset and we're using pcie_write_cmd() to make sure
that we don't see that bus reset as a hotplug event, we really want
to make sure the update is complete.  Testing on an old Lenovo S20
system, which sets surprise hotplug for some slots, this failure to
flush results in a link down event seen by the hotplug controller
when we issue the bus reset and returns us to the undesireable
behavior of removing and re-adding the device.  Force a flush by
adding an explicit call to pcie_wait_cmd().

Signed-off-by: Alex Williamson <>
Cc: [3.17]

 drivers/pci/hotplug/pciehp_hpc.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 0ebf754..e540966 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -660,6 +660,7 @@ int pciehp_reset_slot(struct slot *slot, int probe)
 		 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, 0);
 	if (pciehp_poll_mode)
+	pcie_wait_cmd(ctrl);

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists