linux-kernel - [PATCH 10/11] sdio_uart: Fix the locking on "func" for new code

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Date:	Tue, 03 Nov 2009 14:18:58 +0000
From:	Alan Cox <alan@...ux.intel.com>
To:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	nico@....org
Subject: [PATCH 10/11] sdio_uart: Fix the locking on "func" for new code

The new dtr_rts function didn't take the port->func lock as it should
so add use of the lock there.


Signed-off-by: Alan Cox <alan@...ux.intel.com>
---

 drivers/mmc/card/sdio_uart.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)


diff --git a/drivers/mmc/card/sdio_uart.c b/drivers/mmc/card/sdio_uart.c
index ebb5d4b..0a3acfb 100644
--- a/drivers/mmc/card/sdio_uart.c
+++ b/drivers/mmc/card/sdio_uart.c
@@ -565,10 +565,14 @@ static void uart_dtr_rts(struct tty_port *tport, int onoff)
 {
 	struct sdio_uart_port *port =
 			container_of(tport, struct sdio_uart_port, port);
+	int ret = sdio_uart_claim_func(port);
+	if (ret)
+		return;
 	if (onoff == 0)
 		sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
 	else
 		sdio_uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
+	sdio_uart_release_func(port);
 }
 
 /**

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