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Date:   Wed, 6 Mar 2019 00:15:00 +0000
From:   Vijay Khemka <vijaykhemka@...com>
To:     Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>
CC:     Arnd Bergmann <arnd@...db.de>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "openbmc @ lists . ozlabs . org" <openbmc@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Potential Spoof] Re: [PATCH v2] misc: aspeed-lpc-ctrl: make
 parameter optional

Joel,
Did this patch apply upstream. Somehow I can't find this patch in linux or linux-next or our obmc dev4.19.

Regards
-Vijay

´╗┐On 1/17/19, 10:53 AM, "Linux-aspeed on behalf of Vijay Khemka" <linux-aspeed-bounces+vijaykhemka=fb.com@...ts.ozlabs.org on behalf of vijaykhemka@...com> wrote:

    
    
    On 1/16/19, 10:17 PM, "Joel Stanley" <joel@....id.au> wrote:
    
        On Thu, 17 Jan 2019 at 09:02, Vijay Khemka <vijaykhemka@...com> wrote:
        >
        > Makiing memory-region and flash as optional parameter in device
        > tree if user needs to use these parameter through ioctl then
        > need to define in devicetree.
        >
        > Signed-off-by: Vijay Khemka <vijaykhemka@...com>
        
        Thanks! This looks okay to me. I tested it on one of our systems which
        uses both flash and reserved memory and it was fine.
        
        Reviewed-by: Joel Stanley <joel@....id.au>
        
        Can you also send a patch to update the bindings at
        Documentation/devicetree/bindings/mfd/aspeed-lpc.txt ? I think the
        only change you need to make is to move the memory region and flash
        properties to optional (instead of required).
    
    Sure I will do this.
        
        Cheers,
        
        Joel
        
        > ---
        >  drivers/misc/aspeed-lpc-ctrl.c | 58 +++++++++++++++++++++-------------
        >  1 file changed, 36 insertions(+), 22 deletions(-)
        >
        > diff --git a/drivers/misc/aspeed-lpc-ctrl.c b/drivers/misc/aspeed-lpc-ctrl.c
        > index a024f8042259..332210e06e98 100644
        > --- a/drivers/misc/aspeed-lpc-ctrl.c
        > +++ b/drivers/misc/aspeed-lpc-ctrl.c
        > @@ -68,6 +68,7 @@ static long aspeed_lpc_ctrl_ioctl(struct file *file, unsigned int cmd,
        >                 unsigned long param)
        >  {
        >         struct aspeed_lpc_ctrl *lpc_ctrl = file_aspeed_lpc_ctrl(file);
        > +       struct device *dev = file->private_data;
        >         void __user *p = (void __user *)param;
        >         struct aspeed_lpc_ctrl_mapping map;
        >         u32 addr;
        > @@ -90,6 +91,12 @@ static long aspeed_lpc_ctrl_ioctl(struct file *file, unsigned int cmd,
        >                 if (map.window_id != 0)
        >                         return -EINVAL;
        >
        > +               /* If memory-region is not described in device tree */
        > +               if (!lpc_ctrl->mem_size) {
        > +                       dev_err(dev, "Didn't find reserved memory\n");
        > +                       return -EINVAL;
        > +               }
        > +
        >                 map.size = lpc_ctrl->mem_size;
        >
        >                 return copy_to_user(p, &map, sizeof(map)) ? -EFAULT : 0;
        > @@ -126,9 +133,18 @@ static long aspeed_lpc_ctrl_ioctl(struct file *file, unsigned int cmd,
        >                         return -EINVAL;
        >
        >                 if (map.window_type == ASPEED_LPC_CTRL_WINDOW_FLASH) {
        > +                       if (!lpc_ctrl->pnor_size) {
        > +                               dev_err(dev, "Didn't find host pnor flash\n");
        > +                               return -EINVAL;
        > +                       }
        >                         addr = lpc_ctrl->pnor_base;
        >                         size = lpc_ctrl->pnor_size;
        >                 } else if (map.window_type == ASPEED_LPC_CTRL_WINDOW_MEMORY) {
        > +                       /* If memory-region is not described in device tree */
        > +                       if (!lpc_ctrl->mem_size) {
        > +                               dev_err(dev, "Didn't find reserved memory\n");
        > +                               return -EINVAL;
        > +                       }
        >                         addr = lpc_ctrl->mem_base;
        >                         size = lpc_ctrl->mem_size;
        >                 } else {
        > @@ -196,17 +212,17 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
        >         if (!lpc_ctrl)
        >                 return -ENOMEM;
        >
        > +       /* If flash is described in device tree then store */
        >         node = of_parse_phandle(dev->of_node, "flash", 0);
        >         if (!node) {
        > -               dev_err(dev, "Didn't find host pnor flash node\n");
        > -               return -ENODEV;
        > -       }
        > -
        > -       rc = of_address_to_resource(node, 1, &resm);
        > -       of_node_put(node);
        > -       if (rc) {
        > -               dev_err(dev, "Couldn't address to resource for flash\n");
        > -               return rc;
        > +               dev_dbg(dev, "Didn't find host pnor flash node\n");
        > +       } else {
        > +               rc = of_address_to_resource(node, 1, &resm);
        > +               of_node_put(node);
        > +               if (rc) {
        > +                       dev_err(dev, "Couldn't address to resource for flash\n");
        > +                       return rc;
        > +               }
        >         }
        >
        >         lpc_ctrl->pnor_size = resource_size(&resm);
        > @@ -214,22 +230,22 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
        >
        >         dev_set_drvdata(&pdev->dev, lpc_ctrl);
        >
        > +       /* If memory-region is described in device tree then store */
        >         node = of_parse_phandle(dev->of_node, "memory-region", 0);
        >         if (!node) {
        > -               dev_err(dev, "Didn't find reserved memory\n");
        > -               return -EINVAL;
        > -       }
        > +               dev_dbg(dev, "Didn't find reserved memory\n");
        > +       } else {
        > +               rc = of_address_to_resource(node, 0, &resm);
        > +               of_node_put(node);
        > +               if (rc) {
        > +                       dev_err(dev, "Couldn't address to resource for reserved memory\n");
        > +                       return -ENOMEM;
        > +               }
        >
        > -       rc = of_address_to_resource(node, 0, &resm);
        > -       of_node_put(node);
        > -       if (rc) {
        > -               dev_err(dev, "Couldn't address to resource for reserved memory\n");
        > -               return -ENOMEM;
        > +               lpc_ctrl->mem_size = resource_size(&resm);
        > +               lpc_ctrl->mem_base = resm.start;
        >         }
        >
        > -       lpc_ctrl->mem_size = resource_size(&resm);
        > -       lpc_ctrl->mem_base = resm.start;
        > -
        >         lpc_ctrl->regmap = syscon_node_to_regmap(
        >                         pdev->dev.parent->of_node);
        >         if (IS_ERR(lpc_ctrl->regmap)) {
        > @@ -258,8 +274,6 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
        >                 goto err;
        >         }
        >
        > -       dev_info(dev, "Loaded at %pr\n", &resm);
        > -
        >         return 0;
        >
        >  err:
        > --
        > 2.17.1
        >
        
    
    

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