linux-kernel - [PATCH] xhci: reduce xhci_handshake timeout in xhci

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Date:   Mon, 14 Feb 2022 16:34:23 +0530
From:   Pavankumar Kondeti <quic_pkondeti@...cinc.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Sarah Sharp <sarah.a.sharp@...ux.intel.com>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_ugoswami@...cinc.com>, Jung Daehwan <dh10.jung@...sung.com>,
        Pavankumar Kondeti <quic_pkondeti@...cinc.com>
Subject: [PATCH] xhci: reduce xhci_handshake timeout in xhci_reset

From: Daehwan Jung <dh10.jung@...sung.com>

xhci_reset() is called with interrupts disabled. Waiting 10 seconds for
controller reset and controller ready operations can be fatal to the
system when controller is timed out. Reduce the timeout to 1 second
and print a error message when the time out happens.

Fixes: 22ceac191211 ("xhci: Increase reset timeout for Renesas 720201 host.")
Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
Signed-off-by: Pavankumar Kondeti <quic_pkondeti@...cinc.com>
---
 drivers/usb/host/xhci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index dc357ca..ec4df72 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -196,7 +196,7 @@ int xhci_reset(struct xhci_hcd *xhci)
 		udelay(1000);
 
 	ret = xhci_handshake(&xhci->op_regs->command,
-			CMD_RESET, 0, 10 * 1000 * 1000);
+			CMD_RESET, 0, 1 * 1000 * 1000);
 	if (ret)
 		return ret;
 
@@ -210,7 +210,7 @@ int xhci_reset(struct xhci_hcd *xhci)
 	 * than status until the "Controller Not Ready" flag is cleared.
 	 */
 	ret = xhci_handshake(&xhci->op_regs->status,
-			STS_CNR, 0, 10 * 1000 * 1000);
+			STS_CNR, 0, 1 * 1000 * 1000);
 
 	xhci->usb2_rhub.bus_state.port_c_suspend = 0;
 	xhci->usb2_rhub.bus_state.suspended_ports = 0;
-- 
2.7.4