linux-kernel - Re: [PATCH 07/10] sound: 6fire: move to use usb_control_msg_send() and usb_control_msg

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Date:   Wed, 02 Sep 2020 16:36:58 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     himadrispandya@...il.com, dvyukov@...gle.com,
        linux-usb@...r.kernel.org, perex@...ex.cz, tiwai@...e.com,
        stern@...land.harvard.ed, linux-kernel@...r.kernel.org,
        marcel@...tmann.org, johan.hedberg@...il.com,
        linux-bluetooth@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH 07/10] sound: 6fire: move to use usb_control_msg_send() and usb_control_msg_recv()

On Wed, 02 Sep 2020 13:01:09 +0200,
Greg Kroah-Hartman wrote:
> 
> The usb_control_msg_send() and usb_control_msg_recv() calls can return
> an error if a "short" write/read happens, so move the driver over to
> using those calls instead, saving some logic in the wrapper functions
> that were being used in this driver.
> 
> This also resolves a long-staging bug where data on the stack was being
> sent in a USB control message, which was not allowed.
> 
> Cc: Jaroslav Kysela <perex@...ex.cz>
> Cc: Takashi Iwai <tiwai@...e.com>
> Cc: alsa-devel@...a-project.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Reviewed-by: Takashi Iwai <tiwai@...e.de>


thanks,

Takashi


> ---
>  sound/usb/6fire/firmware.c | 38 +++++++++++++-------------------------
>  1 file changed, 13 insertions(+), 25 deletions(-)
> 
> diff --git a/sound/usb/6fire/firmware.c b/sound/usb/6fire/firmware.c
> index 69137c14d0dc..5b8994070c96 100644
> --- a/sound/usb/6fire/firmware.c
> +++ b/sound/usb/6fire/firmware.c
> @@ -158,29 +158,17 @@ static int usb6fire_fw_ihex_init(const struct firmware *fw,
>  static int usb6fire_fw_ezusb_write(struct usb_device *device,
>  		int type, int value, char *data, int len)
>  {
> -	int ret;
> -
> -	ret = usb_control_msg(device, usb_sndctrlpipe(device, 0), type,
> -			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
> -			value, 0, data, len, HZ);
> -	if (ret < 0)
> -		return ret;
> -	else if (ret != len)
> -		return -EIO;
> -	return 0;
> +	return usb_control_msg_send(device, 0, type,
> +				    USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
> +				    value, 0, data, len, HZ);
>  }
>  
>  static int usb6fire_fw_ezusb_read(struct usb_device *device,
>  		int type, int value, char *data, int len)
>  {
> -	int ret = usb_control_msg(device, usb_rcvctrlpipe(device, 0), type,
> -			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, value,
> -			0, data, len, HZ);
> -	if (ret < 0)
> -		return ret;
> -	else if (ret != len)
> -		return -EIO;
> -	return 0;
> +	return usb_control_msg_recv(device, 0, type,
> +				    USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
> +				    value, 0, data, len, HZ);
>  }
>  
>  static int usb6fire_fw_fpga_write(struct usb_device *device,
> @@ -230,7 +218,7 @@ static int usb6fire_fw_ezusb_upload(
>  	/* upload firmware image */
>  	data = 0x01; /* stop ezusb cpu */
>  	ret = usb6fire_fw_ezusb_write(device, 0xa0, 0xe600, &data, 1);
> -	if (ret < 0) {
> +	if (ret) {
>  		kfree(rec);
>  		release_firmware(fw);
>  		dev_err(&intf->dev,
> @@ -242,7 +230,7 @@ static int usb6fire_fw_ezusb_upload(
>  	while (usb6fire_fw_ihex_next_record(rec)) { /* write firmware */
>  		ret = usb6fire_fw_ezusb_write(device, 0xa0, rec->address,
>  				rec->data, rec->len);
> -		if (ret < 0) {
> +		if (ret) {
>  			kfree(rec);
>  			release_firmware(fw);
>  			dev_err(&intf->dev,
> @@ -257,7 +245,7 @@ static int usb6fire_fw_ezusb_upload(
>  	if (postdata) { /* write data after firmware has been uploaded */
>  		ret = usb6fire_fw_ezusb_write(device, 0xa0, postaddr,
>  				postdata, postlen);
> -		if (ret < 0) {
> +		if (ret) {
>  			dev_err(&intf->dev,
>  				"unable to upload ezusb firmware %s: post urb.\n",
>  				fwname);
> @@ -267,7 +255,7 @@ static int usb6fire_fw_ezusb_upload(
>  
>  	data = 0x00; /* resume ezusb cpu */
>  	ret = usb6fire_fw_ezusb_write(device, 0xa0, 0xe600, &data, 1);
> -	if (ret < 0) {
> +	if (ret) {
>  		dev_err(&intf->dev,
>  			"unable to upload ezusb firmware %s: end message.\n",
>  			fwname);
> @@ -302,7 +290,7 @@ static int usb6fire_fw_fpga_upload(
>  	end = fw->data + fw->size;
>  
>  	ret = usb6fire_fw_ezusb_write(device, 8, 0, NULL, 0);
> -	if (ret < 0) {
> +	if (ret) {
>  		kfree(buffer);
>  		release_firmware(fw);
>  		dev_err(&intf->dev,
> @@ -327,7 +315,7 @@ static int usb6fire_fw_fpga_upload(
>  	kfree(buffer);
>  
>  	ret = usb6fire_fw_ezusb_write(device, 9, 0, NULL, 0);
> -	if (ret < 0) {
> +	if (ret) {
>  		dev_err(&intf->dev,
>  			"unable to upload fpga firmware: end urb.\n");
>  		return ret;
> @@ -363,7 +351,7 @@ int usb6fire_fw_init(struct usb_interface *intf)
>  	u8 buffer[12];
>  
>  	ret = usb6fire_fw_ezusb_read(device, 1, 0, buffer, 8);
> -	if (ret < 0) {
> +	if (ret) {
>  		dev_err(&intf->dev,
>  			"unable to receive device firmware state.\n");
>  		return ret;
> -- 
> 2.28.0
>