Public bug reported:
This request is to pull in the following patch for NVMe bug from
https://lore.kernel.org/patchwork/patch/974880/ in the linux-gcp kernel:
===
This patch adds full memory barrier into nvme_dbbuf_update_and_check_event
function to ensure that the shadow doorbell is written before reading
EventIdx from memory. This is a critical bugfix for initial patch that
added support for shadow doorbell into NVMe driver[...].
** Affects: linux-gcp (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1788222
Title:
Bugfix for handling of shadow doorbell buffer
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