linux-kernel - Re: [PATCH] usbip: dynamically allocate idev by nports found in sysfs

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Message-ID: <05a0fd16-cd54-1bb8-7566-0d88e1bd73cf@kernel.org>
Date:   Tue, 22 May 2018 10:06:27 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     Michael Grzeschik <m.grzeschik@...gutronix.de>,
        linux-usb@...r.kernel.org
Cc:     valentina.manea.m@...il.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH] usbip: dynamically allocate idev by nports found in sysfs

Hi Michael,

Thanks for the patch. Couple of comments below:

On 05/18/2018 08:39 AM, Michael Grzeschik wrote:
> As the amount of available ports varies by the kernels build
> configuration. To remove the limitation of the fixed 128 ports
> we allocate the amount of idevs by using the number we get
> from the kernel.
> 
> Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
> ---
>  tools/usb/usbip/libsrc/vhci_driver.c | 11 ++++++++---
>  tools/usb/usbip/libsrc/vhci_driver.h |  3 +--
>  2 files changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/usb/usbip/libsrc/vhci_driver.c b/tools/usb/usbip/libsrc/vhci_driver.c
> index c9c81614a66ad..9a8acfc7697fa 100644
> --- a/tools/usb/usbip/libsrc/vhci_driver.c
> +++ b/tools/usb/usbip/libsrc/vhci_driver.c
> @@ -266,11 +266,11 @@ int usbip_vhci_driver_open(void)
>  	if (vhci_driver->nports <= 0) {
>  		err("no available ports");
>  		goto err;
> -	} else if (vhci_driver->nports > MAXNPORT) {
> -		err("port number exceeds %d", MAXNPORT);
> -		goto err;
>  	}
>  
> +	vhci_driver->idev = calloc(vhci_driver->nports,
> +			sizeof(struct usbip_imported_device));
> +

Missing check for memory allocation failure. Please add it.

>  	vhci_driver->ncontrollers = get_ncontrollers();
>  	dbg("available controllers: %d", vhci_driver->ncontrollers);
>  
> @@ -287,6 +287,9 @@ int usbip_vhci_driver_open(void)
>  err:
>  	udev_device_unref(vhci_driver->hc_device);
>  
> +	if (vhci_driver->idev)
> +		free(vhci_driver->idev);
> +
>  	if (vhci_driver)
>  		free(vhci_driver);
>  
> @@ -305,6 +308,8 @@ void usbip_vhci_driver_close(void)
>  
>  	udev_device_unref(vhci_driver->hc_device);
>  
> +	free(vhci_driver->idev);
> +
>  	free(vhci_driver);
>  
>  	vhci_driver = NULL;
> diff --git a/tools/usb/usbip/libsrc/vhci_driver.h b/tools/usb/usbip/libsrc/vhci_driver.h
> index 418b404d51210..67dbd1551e159 100644
> --- a/tools/usb/usbip/libsrc/vhci_driver.h
> +++ b/tools/usb/usbip/libsrc/vhci_driver.h
> @@ -13,7 +13,6 @@
>  
>  #define USBIP_VHCI_BUS_TYPE "platform"
>  #define USBIP_VHCI_DEVICE_NAME "vhci_hcd.0"
> -#define MAXNPORT 128
>  
>  enum hub_speed {
>  	HUB_SPEED_HIGH = 0,
> @@ -41,7 +40,7 @@ struct usbip_vhci_driver {
>  
>  	int ncontrollers;
>  	int nports;
> -	struct usbip_imported_device idev[MAXNPORT];
> +	struct usbip_imported_device *idev;
>  };
>  
>  
> 

Rest looks good.

thanks,
-- Shuah