linux-kernel - [PATCH] serial_core: Change UART PM state to OFF on failure

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1462527983-32108-1-git-send-email-pramod.gurav@linaro.org>
Date:	Fri,  6 May 2016 15:16:23 +0530
From:	Pramod Gurav <pramod.gurav@...aro.org>
To:	gregkh@...uxfoundation.org, jslaby@...e.com
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pramod Gurav <pramod.gurav@...aro.org>
Subject: [PATCH] serial_core: Change UART PM state to OFF on failure

uart_change_pm is used to turn on the UART controller resources and
change UART's PM status. On failure to allocate pages the controller
be left in ON state. This will change the state to OFF on failure.

Signed-off-by: Pramod Gurav <pramod.gurav@...aro.org>
---
 drivers/tty/serial/serial_core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 62fe368..58af2e9 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -156,9 +156,10 @@ static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
 	if (!state->xmit.buf) {
 		/* This is protected by the per port mutex */
 		page = get_zeroed_page(GFP_KERNEL);
-		if (!page)
+		if (!page) {
+			uart_change_pm(state, UART_PM_STATE_OFF);
 			return -ENOMEM;
-
+		}
 		state->xmit.buf = (unsigned char *) page;
 		uart_circ_clear(&state->xmit);
 	}
-- 
1.8.2.1