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[Bug 1788222] Re: Bugfix for handling of shadow doorbell buffer

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>
Date: Tue, 21 Aug 2018 16:09:26 -0000
Reply-to: Bug 1788222 <1788222@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

SRU request:
https://lists.ubuntu.com/archives/kernel-team/2018-August/094767.html

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-gcp (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Also affects: linux-gcp (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: linux-gcp (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: linux (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: linux (Ubuntu Cosmic)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1788222

Title:
  Bugfix for handling of shadow doorbell buffer

Status in linux package in Ubuntu:
  In Progress
Status in linux-gcp package in Ubuntu:
  New
Status in linux source package in Xenial:
  In Progress
Status in linux-gcp source package in Xenial:
  New
Status in linux source package in Bionic:
  In Progress
Status in linux-gcp source package in Bionic:
  New
Status in linux source package in Cosmic:
  In Progress
Status in linux-gcp source package in Cosmic:
  New

Bug description:
  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[...].

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