linux-kernel - [PATCH 3/3] usb: gadget: f

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Date:   Sun, 25 Jun 2017 16:23:47 +0300
From:   Ruslan Bilovol <ruslan.bilovol@...il.com>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] usb: gadget: f_uac2: endianness fixes.

As per USB spec, multiple-bytes fields are stored
in little-endian order. Use CPU<->LE helpers for
such fields.

Signed-off-by: Ruslan Bilovol <ruslan.bilovol@...il.com>
---
 drivers/usb/gadget/function/f_uac2.c | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index 9082ce2..f05c3f3 100644
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -168,7 +168,7 @@ enum {
 	.bAssocTerminal = 0,
 	.bCSourceID = USB_OUT_CLK_ID,
 	.iChannelNames = 0,
-	.bmControls = (CONTROL_RDWR << COPY_CTRL),
+	.bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 };
 
 /* Input Terminal for I/O-In */
@@ -182,7 +182,7 @@ enum {
 	.bAssocTerminal = 0,
 	.bCSourceID = USB_IN_CLK_ID,
 	.iChannelNames = 0,
-	.bmControls = (CONTROL_RDWR << COPY_CTRL),
+	.bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 };
 
 /* Ouput Terminal for USB_IN */
@@ -196,7 +196,7 @@ enum {
 	.bAssocTerminal = 0,
 	.bSourceID = IO_IN_IT_ID,
 	.bCSourceID = USB_IN_CLK_ID,
-	.bmControls = (CONTROL_RDWR << COPY_CTRL),
+	.bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 };
 
 /* Ouput Terminal for I/O-Out */
@@ -210,7 +210,7 @@ enum {
 	.bAssocTerminal = 0,
 	.bSourceID = USB_OUT_IT_ID,
 	.bCSourceID = USB_OUT_CLK_ID,
-	.bmControls = (CONTROL_RDWR << COPY_CTRL),
+	.bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 };
 
 static struct uac2_ac_header_descriptor ac_hdr_desc = {
@@ -220,9 +220,10 @@ enum {
 	.bDescriptorSubtype = UAC_MS_HEADER,
 	.bcdADC = cpu_to_le16(0x200),
 	.bCategory = UAC2_FUNCTION_IO_BOX,
-	.wTotalLength = sizeof in_clk_src_desc + sizeof out_clk_src_desc
-			 + sizeof usb_out_it_desc + sizeof io_in_it_desc
-			+ sizeof usb_in_ot_desc + sizeof io_out_ot_desc,
+	.wTotalLength = cpu_to_le16(sizeof in_clk_src_desc
+			+ sizeof out_clk_src_desc + sizeof usb_out_it_desc
+			+ sizeof io_in_it_desc + sizeof usb_in_ot_desc
+			+ sizeof io_out_ot_desc),
 	.bmControls = 0,
 };
 
@@ -569,10 +570,12 @@ static void set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
 		return ret;
 	}
 
-	agdev->in_ep_maxpsize = max(fs_epin_desc.wMaxPacketSize,
-					hs_epin_desc.wMaxPacketSize);
-	agdev->out_ep_maxpsize = max(fs_epout_desc.wMaxPacketSize,
-					hs_epout_desc.wMaxPacketSize);
+	agdev->in_ep_maxpsize = max_t(u16,
+				le16_to_cpu(fs_epin_desc.wMaxPacketSize),
+				le16_to_cpu(hs_epin_desc.wMaxPacketSize));
+	agdev->out_ep_maxpsize = max_t(u16,
+				le16_to_cpu(fs_epout_desc.wMaxPacketSize),
+				le16_to_cpu(hs_epout_desc.wMaxPacketSize));
 
 	hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
 	hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
-- 
1.9.1