linux-kernel - [PATCH 5.4 147/255] xhci: Dont show warning for reinit on known broken suspend

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Message-Id: <20221024113007.509934646@linuxfoundation.org>
Date:   Mon, 24 Oct 2022 13:30:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Artem S. Tashkinov" <aros@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 147/255] xhci: Dont show warning for reinit on known broken suspend

From: Mario Limonciello <mario.limonciello@....com>

[ Upstream commit 484d6f7aa3283d082c87654b7fe7a7f725423dfb ]

commit 8b328f8002bc ("xhci: re-initialize the HC during resume if HCE was
set") introduced a new warning message when the host controller error
was set and re-initializing.

This is expected behavior on some designs which already set
`xhci->broken_suspend` so the new warning is alarming to some users.

Modify the code to only show the warning if this was a surprising behavior
to the XHCI driver.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=216470
Fixes: 8b328f8002bc ("xhci: re-initialize the HC during resume if HCE was set")
Reported-by: Artem S. Tashkinov <aros@....com>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Link: https://lore.kernel.org/r/20220921123450.671459-4-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/host/xhci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 5ce16a259e61..3537113f006f 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1163,7 +1163,8 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
 	/* re-initialize the HC on Restore Error, or Host Controller Error */
 	if (temp & (STS_SRE | STS_HCE)) {
 		reinit_xhc = true;
-		xhci_warn(xhci, "xHC error in resume, USBSTS 0x%x, Reinit\n", temp);
+		if (!xhci->broken_suspend)
+			xhci_warn(xhci, "xHC error in resume, USBSTS 0x%x, Reinit\n", temp);
 	}
 
 	if (reinit_xhc) {
-- 
2.35.1