linux-kernel - Re: [PATCH] 8250_lpss: check null return when calling pci_ioremap

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Date:   Fri, 19 Jul 2019 18:15:19 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Navid Emamdoost <navid.emamdoost@...il.com>,
        Kangjie Lu <kjlu@....edu>, Aditya Pakki <pakki001@....edu>
Cc:     emamd001@....edu, smccaman@....edu,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Vinod Koul <vkoul@...nel.org>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] 8250_lpss: check null return when calling pci_ioremap_bar

On Fri, Jul 19, 2019 at 04:37:35PM +0300, Andy Shevchenko wrote:
> On Thu, Jul 18, 2019 at 09:54:42PM -0500, Navid Emamdoost wrote:

> Thus, please, collaborate guys, and send one compiling solution  based on [1].

> [1]: https://www.spinics.net/lists/linux-serial/msg33965.html

For your convenience (what has to be applied to v4):

diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c
index 53ca9ba6ab4b..6214da67e9b3 100644
--- a/drivers/tty/serial/8250/8250_lpss.c
+++ b/drivers/tty/serial/8250/8250_lpss.c
@@ -195,11 +195,15 @@ static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
 
 static void qrk_serial_exit_dma(struct lpss8250 *lpss)
 {
+	struct dw_dma_chip *chip = &lpss->dma_chip;
 	struct dw_dma_slave *param = &lpss->dma_param;
 
 	if (!param->dma_dev)
 		return;
-	dw_dma_remove(&lpss->dma_chip);
+
+	dw_dma_remove(chip);
+
+	pci_iounmap(to_pci_dev(chip->dev), chip->regs);
 }
 #else	/* CONFIG_SERIAL_8250_DMA */
 static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port) {}

-- 
With Best Regards,
Andy Shevchenko