From 3a69ad3b2a0df578ca340ba95f35230ee9529c9c Mon Sep 17 00:00:00 2001
From: Stijn Tintel <stijn@linux-ipv6.be>
Date: Sun, 8 Oct 2017 14:58:59 +0300
Subject: kernel: split 82574L patch into multiple files
When refreshing patches that cointain multiple patches including headers
in a single file, quilt will remove the headers from all but the first
patch. This makes it difficult to review commits that refresh patches.
Next to that, if only a few of the patch series are accepted in -stable,
the patch needs to be manually modified. With each patch in a separate
file, it's just a matter of git rm.
Refresh patches while at it.
Patchwork links:
[1/5] https://patchwork.kernel.org/patch/9857487/
[2/5] https://patchwork.kernel.org/patch/9857489/
[3/5] https://patchwork.kernel.org/patch/9857495/
[4/5] https://patchwork.kernel.org/patch/9857491/
[5/5] https://patchwork.kernel.org/patch/9857493/
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
---
...Separate-signaling-for-link-check-link-up.patch | 90 ++++++++++++++++++++++
1 file changed, 90 insertions(+)
create mode 100644 target/linux/generic/pending-4.9/190-4-5-e1000e-Separate-signaling-for-link-check-link-up.patch
(limited to 'target/linux/generic/pending-4.9/190-4-5-e1000e-Separate-signaling-for-link-check-link-up.patch')
diff --git a/target/linux/generic/pending-4.9/190-4-5-e1000e-Separate-signaling-for-link-check-link-up.patch b/target/linux/generic/pending-4.9/190-4-5-e1000e-Separate-signaling-for-link-check-link-up.patch
new file mode 100644
index 0000000..cc2cf73
--- /dev/null
+++ b/target/linux/generic/pending-4.9/190-4-5-e1000e-Separate-signaling-for-link-check-link-up.patch
@@ -0,0 +1,90 @@
+From patchwork Fri Jul 21 18:36:26 2017
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Subject: [4/5] e1000e: Separate signaling for link check/link up
+From: Benjamin Poirier <bpoirier@suse.com>
+X-Patchwork-Id: 9857491
+Message-Id: <20170721183627.13373-4-bpoirier@suse.com>
+To: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
+Cc: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>,
+ intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
+ linux-kernel@vger.kernel.org
+Date: Fri, 21 Jul 2017 11:36:26 -0700
+
+Lennart reported the following race condition:
+
+\ e1000_watchdog_task
+ \ e1000e_has_link
+ \ hw->mac.ops.check_for_link() === e1000e_check_for_copper_link
+ /* link is up */
+ mac->get_link_status = false;
+
+ /* interrupt */
+ \ e1000_msix_other
+ hw->mac.get_link_status = true;
+
+ link_active = !hw->mac.get_link_status
+ /* link_active is false, wrongly */
+
+This problem arises because the single flag get_link_status is used to
+signal two different states: link status needs checking and link status is
+down.
+
+Avoid the problem by using the return value of .check_for_link to signal
+the link status to e1000e_has_link().
+
+Reported-by: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
+Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
+---
+ drivers/net/ethernet/intel/e1000e/mac.c | 11 ++++++++---
+ drivers/net/ethernet/intel/e1000e/netdev.c | 2 +-
+ 2 files changed, 9 insertions(+), 4 deletions(-)
+
+--- a/drivers/net/ethernet/intel/e1000e/mac.c
++++ b/drivers/net/ethernet/intel/e1000e/mac.c
+@@ -410,6 +410,9 @@ void e1000e_clear_hw_cntrs_base(struct e
+ * Checks to see of the link status of the hardware has changed. If a
+ * change in link status has been detected, then we read the PHY registers
+ * to get the current speed/duplex if link exists.
++ *
++ * Returns a negative error code (-E1000_ERR_*) or 0 (link down) or 1 (link
++ * up).
+ **/
+ s32 e1000e_check_for_copper_link(struct e1000_hw *hw)
+ {
+@@ -423,7 +426,7 @@ s32 e1000e_check_for_copper_link(struct
+ * Change or Rx Sequence Error interrupt.
+ */
+ if (!mac->get_link_status)
+- return 0;
++ return 1;
+
+ /* First we want to see if the MII Status Register reports
+ * link. If so, then we want to get the current speed/duplex
+@@ -461,10 +464,12 @@ s32 e1000e_check_for_copper_link(struct
+ * different link partner.
+ */
+ ret_val = e1000e_config_fc_after_link_up(hw);
+- if (ret_val)
++ if (ret_val) {
+ e_dbg("Error configuring flow control\n");
++ return ret_val;
++ }
+
+- return ret_val;
++ return 1;
+ }
+
+ /**
+--- a/drivers/net/ethernet/intel/e1000e/netdev.c
++++ b/drivers/net/ethernet/intel/e1000e/netdev.c
+@@ -5056,7 +5056,7 @@ static bool e1000e_has_link(struct e1000
+ case e1000_media_type_copper:
+ if (hw->mac.get_link_status) {
+ ret_val = hw->mac.ops.check_for_link(hw);
+- link_active = !hw->mac.get_link_status;
++ link_active = ret_val > 0;
+ } else {
+ link_active = true;
+ }
--
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