linux-kernel - [PATCH/RESEND 02/12] msm_serial: Use devm_clk

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

Message-Id: <1371490999-15501-3-git-send-email-sboyd@codeaurora.org>
Date:	Mon, 17 Jun 2013 10:43:09 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	David Brown <davidb@...eaurora.org>,
	Daniel Walker <dwalker@...o99.com>,
	Bryan Huntsman <bryanh@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH/RESEND 02/12] msm_serial: Use devm_clk_get() and properly return errors

Clocks are not clk_put() in this driver's error paths during
probe. The code that checks for clock errors also fails to
properly return the error code from the pclk member if it turns
out to be the failing clock, leading to potentially confusing
error values if the clk member is not an error pointer. Fix these
problems with devm_clk_get() and proper error checking.

Removing the clk_put() in msm_serial_remove() also points out
that msm_port is unused. Furthermore, msm_port is the wrong type
and so the clk_put() would be using the wrong pointer. Replace it
with the proper type and call uart_remove_one_port() to do the
proper cleanup.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
---
 drivers/tty/serial/msm_serial.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index 0149603..2c6cfb3 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -884,19 +884,22 @@ static int __init msm_serial_probe(struct platform_device *pdev)
 		msm_port->is_uartdm = 0;
 
 	if (msm_port->is_uartdm) {
-		msm_port->clk = clk_get(&pdev->dev, "gsbi_uart_clk");
-		msm_port->pclk = clk_get(&pdev->dev, "gsbi_pclk");
+		msm_port->clk = devm_clk_get(&pdev->dev, "gsbi_uart_clk");
+		msm_port->pclk = devm_clk_get(&pdev->dev, "gsbi_pclk");
 	} else {
-		msm_port->clk = clk_get(&pdev->dev, "uart_clk");
+		msm_port->clk = devm_clk_get(&pdev->dev, "uart_clk");
 		msm_port->pclk = ERR_PTR(-ENOENT);
 	}
 
-	if (unlikely(IS_ERR(msm_port->clk) || (IS_ERR(msm_port->pclk) &&
-					       msm_port->is_uartdm)))
-			return PTR_ERR(msm_port->clk);
+	if (IS_ERR(msm_port->clk))
+		return PTR_ERR(msm_port->clk);
+
+	if (msm_port->is_uartdm) {
+		if (IS_ERR(msm_port->pclk))
+			return PTR_ERR(msm_port->pclk);
 
-	if (msm_port->is_uartdm)
 		clk_set_rate(msm_port->clk, 1843200);
+	}
 
 	port->uartclk = clk_get_rate(msm_port->clk);
 	printk(KERN_INFO "uartclk = %d\n", port->uartclk);
@@ -919,9 +922,9 @@ static int __init msm_serial_probe(struct platform_device *pdev)
 
 static int msm_serial_remove(struct platform_device *pdev)
 {
-	struct msm_port *msm_port = platform_get_drvdata(pdev);
+	struct uart_port *port = platform_get_drvdata(pdev);
 
-	clk_put(msm_port->clk);
+	uart_remove_one_port(&msm_uart_driver, port);
 
 	return 0;
 }
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/