usb: gadget: ncm: Fix endianness of wMaxSegmentSize variable in ecm_desc

Recent commit [1] added support for changing max segment size of the NCM
interface via configfs. But the value of segment size value stored in
ncm_opts need to be converted to little endian before saving it in
ecm_desc. Also while initialising the value of segment size in opts during
instance allocation, the value ETH_FRAME_LEN needs to be assigned directly
without any conversion as ETH_FRAME_LEN and the variable max_segment_size
are native endian. The current implementaion modifies it into little endian
thus breaking things for big endian targets.

Fix endianness while assigning these variables.
While at it, fix up some stray spaces in comments added in code.

[1]: https://lore.kernel.org/all/20231221153216.18657-1-quic_kriskura@quicinc.com/

Fixes: 1900daeefd3e ("usb: gadget: ncm: Add support to update wMaxSegmentSize via configfs")
Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Reviewed-by: Maciej Żenczykowski <maze@google.com>
Link: https://lore.kernel.org/r/20240118154910.8765-1-quic_kriskura@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/f_ncm.c b/drivers/usb/gadget/function/f_ncm.c
index a1575a0ca568d7c46bc23bd605404096db14e6e5..ca5d5f5649982a6752b03053421cbf31c7589276 100644 (file)
--- a/drivers/usb/gadget/function/f_ncm.c
+++ b/drivers/usb/gadget/function/f_ncm.c
@@ -105,8 +105,8 @@ static inline struct f_ncm *func_to_ncm(struct usb_function *f)
 
 /*
  * Although max mtu as dictated by u_ether is 15412 bytes, setting
- * max_segment_sizeto 15426 would not be efficient. If user chooses segment
- * size to be (>= 8192), then we can't aggregate more than one  buffer in each
+ * max_segment_size to 15426 would not be efficient. If user chooses segment
+ * size to be (>= 8192), then we can't aggregate more than one buffer in each
  * NTB (assuming each packet coming from network layer is >= 8192 bytes) as ep
  * maxpacket limit is 16384. So let max_segment_size be limited to 8000 to allow
  * at least 2 packets to be aggregated reducing wastage of NTB buffer space
@@ -1489,7 +1489,7 @@ static int ncm_bind(struct usb_configuration *c, struct usb_function *f)
        ncm_data_intf.bInterfaceNumber = status;
        ncm_union_desc.bSlaveInterface0 = status;
 
-       ecm_desc.wMaxSegmentSize = ncm_opts->max_segment_size;
+       ecm_desc.wMaxSegmentSize = cpu_to_le16(ncm_opts->max_segment_size);
 
        status = -ENODEV;
 
@@ -1685,7 +1685,7 @@ static struct usb_function_instance *ncm_alloc_inst(void)
                kfree(opts);
                return ERR_CAST(net);
        }
-       opts->max_segment_size = cpu_to_le16(ETH_FRAME_LEN);
+       opts->max_segment_size = ETH_FRAME_LEN;
        INIT_LIST_HEAD(&opts->ncm_os_desc.ext_prop);
 
        descs[0] = &opts->ncm_os_desc;