ACK: [linux-azure:xenial][PATCH] PCI: hv: Do not sleep in compose_msi_msg()
Seth Forshee
seth.forshee at canonical.com
Tue Feb 6 13:34:22 UTC 2018
On Tue, Feb 06, 2018 at 10:14:01AM -0200, Marcelo Henrique Cerri wrote:
> From: Stephen Hemminger <stephen at networkplumber.org>
>
> BugLink: http://bugs.launchpad.net/bugs/1747543
>
> The setup of MSI with Hyper-V host was sleeping with locks held. This
> error is reported when doing SR-IOV hotplug with kernel built with lockdep:
>
> BUG: sleeping function called from invalid context at kernel/sched/completion.c:93
> in_atomic(): 1, irqs_disabled(): 1, pid: 1405, name: ip
> 3 locks held by ip/1405:
> #0: (rtnl_mutex){+.+.+.}, at: [<ffffffff976b10bb>] rtnetlink_rcv+0x1b/0x40
> #1: (&desc->request_mutex){+.+...}, at: [<ffffffff970ddd33>] __setup_irq+0xb3/0x720
> #2: (&irq_desc_lock_class){-.-...}, at: [<ffffffff970ddd65>] __setup_irq+0xe5/0x720
> irq event stamp: 3476
> hardirqs last enabled at (3475): [<ffffffff971b3005>] get_page_from_freelist+0x225/0xc90
> hardirqs last disabled at (3476): [<ffffffff978024e7>] _raw_spin_lock_irqsave+0x27/0x90
> softirqs last enabled at (2446): [<ffffffffc05ef0b0>] ixgbevf_configure+0x380/0x7c0 [ixgbevf]
> softirqs last disabled at (2444): [<ffffffffc05ef08d>] ixgbevf_configure+0x35d/0x7c0 [ixgbevf]
>
> The workaround is to poll for host response instead of blocking on
> completion.
>
> Signed-off-by: Stephen Hemminger <sthemmin at microsoft.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>
> (cherry picked from commit 80bfeeb9dd6b54ac108c884c792f0fc7d4912bee)
> Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri at canonical.com>
Acked-by: Seth Forshee <seth.forshee at canonical.com>
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