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[1/1,SRU,OEM-5.14] net: atlantic: always deep reset on pm op, fixing up my null deref regression

Message ID 20220609055451.1805026-2-koba.ko@canonical.com
State New
Headers show
Series Fix system hang during suspend and resume with atlantic nic | expand

Commit Message

Koba Ko June 9, 2022, 5:54 a.m. UTC 
From: Manuel Ullmann <labre@posteo.de>

BugLink: https://bugs.launchpad.net/bugs/1978058

The impact of this regression is the same for resume that I saw on
thaw: the kernel hangs and nothing except SysRq rebooting can be done.

Fixes regression in commit cbe6c3a8f8f4 ("net: atlantic: invert deep
par in pm functions, preventing null derefs"), where I disabled deep
pm resets in suspend and resume, trying to make sense of the
atl_resume_common() deep parameter in the first place.

It turns out, that atlantic always has to deep reset on pm
operations. Even though I expected that and tested resume, I screwed
up by kexec-rebooting into an unpatched kernel, thus missing the
breakage.

This fixup obsoletes the deep parameter of atl_resume_common, but I
leave the cleanup for the maintainers to post to mainline.

Suspend and hibernation were successfully tested by the reporters.

Fixes: cbe6c3a8f8f4 ("net: atlantic: invert deep par in pm functions, preventing null derefs")
Link: https://lore.kernel.org/regressions/9-Ehc_xXSwdXcvZqKD5aSqsqeNj5Izco4MYEwnx5cySXVEc9-x_WC4C3kAoCqNTi-H38frroUK17iobNVnkLtW36V6VWGSQEOHXhmVMm5iQ=@protonmail.com/
Reported-by: Jordan Leppert <jordanleppert@protonmail.com>
Reported-by: Holger Hoffstaette <holger@applied-asynchrony.com>
Tested-by: Jordan Leppert <jordanleppert@protonmail.com>
Tested-by: Holger Hoffstaette <holger@applied-asynchrony.com>
CC: <stable@vger.kernel.org> # 5.10+
Signed-off-by: Manuel Ullmann <labre@posteo.de>
Link: https://lore.kernel.org/r/87bkw8dfmp.fsf@posteo.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
(cherry picked from commit 1809c30b6e5a83a1de1435fe01aaa4de4d626a7c)
Signed-off-by: Koba Ko <koba.ko@canonical.com>
---
 drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
index bdfd462c74db9..fc5ea434a27c9 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
@@ -455,7 +455,7 @@  static int aq_pm_freeze(struct device *dev)
 
 static int aq_pm_suspend_poweroff(struct device *dev)
 {
-	return aq_suspend_common(dev, false);
+	return aq_suspend_common(dev, true);
 }
 
 static int aq_pm_thaw(struct device *dev)
@@ -465,7 +465,7 @@  static int aq_pm_thaw(struct device *dev)
 
 static int aq_pm_resume_restore(struct device *dev)
 {
-	return atl_resume_common(dev, false);
+	return atl_resume_common(dev, true);
 }
 
 static const struct dev_pm_ops aq_pm_ops = {