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Farhan Ali
231c7a57d1
The current MSI-X restoration path assumes the Command register Memory bit
is enabled when writing MSI-X messages. But it's possible the last saved
and restored state of a device may not have the Memory bit enabled, even if
a device driver later enables Memory bit and MSI-X. Attempting to access
Memory space without Memory bit enabled can lead to Unsupported Request
(UR) from the device. Fix this by enabling Memory bit and restore it
afterwards.
Fixes: 41017f0cac ("[PATCH] PCI: MSI(X) save/restore for suspend/resume")
Signed-off-by: Farhan Ali <[email protected]>
[bhelgaas: comment]
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Reviewed-by: Niklas Schnelle <[email protected]>
Cc: [email protected]
Link: https://patch.msgid.link/[email protected]