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usb: common: debug: Check non-standard control requests

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Previously usb_decode_ctrl() only decodes standard control requests, but
it was used for non-standard requests also. If it's non-standard or
unknown standard bRequest, print the Setup data values.

Fixes: af32423a2d ("usb: dwc3: trace: decode ctrl request")
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/8d6a30f2f2f953eff833a5bc5aac640a4cc2fc9f.1658971571.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thinh Nguyen 2022-07-27 18:38:01 -07:00 committed by Greg Kroah-Hartman
parent 808e8bff6f
commit b6155eaf6b
1 changed files with 64 additions and 32 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

96
drivers/usb/common/debug.c
View file

@ -208,30 +208,28 @@ static void usb_decode_set_isoch_delay(__u8 wValue, char *str, size_t size)
snprintf(str, size, "Set Isochronous Delay(Delay = %d ns)", wValue);
}
/**
* usb_decode_ctrl - Returns human readable representation of control request.
* @str: buffer to return a human-readable representation of control request.
* This buffer should have about 200 bytes.
* @size: size of str buffer.
* @bRequestType: matches the USB bmRequestType field
* @bRequest: matches the USB bRequest field
* @wValue: matches the USB wValue field (CPU byte order)
* @wIndex: matches the USB wIndex field (CPU byte order)
* @wLength: matches the USB wLength field (CPU byte order)
*
* Function returns decoded, formatted and human-readable description of
* control request packet.
*
* The usage scenario for this is for tracepoints, so function as a return
* use the same value as in parameters. This approach allows to use this
* function in TP_printk
*
* Important: wValue, wIndex, wLength parameters before invoking this function
* should be processed by le16_to_cpu macro.
*/
const char *usb_decode_ctrl(char *str, size_t size, __u8 bRequestType,
__u8 bRequest, __u16 wValue, __u16 wIndex,
__u16 wLength)
static void usb_decode_ctrl_generic(char *str, size_t size, __u8 bRequestType,
__u8 bRequest, __u16 wValue, __u16 wIndex,
__u16 wLength)
{
u8 recip = bRequestType & USB_RECIP_MASK;
u8 type = bRequestType & USB_TYPE_MASK;
snprintf(str, size,
"Type=%s Recipient=%s Dir=%s bRequest=%u wValue=%u wIndex=%u wLength=%u",
(type == USB_TYPE_STANDARD) ? "Standard" :
(type == USB_TYPE_VENDOR) ? "Vendor" :
(type == USB_TYPE_CLASS) ? "Class" : "Unknown",
(recip == USB_RECIP_DEVICE) ? "Device" :
(recip == USB_RECIP_INTERFACE) ? "Interface" :
(recip == USB_RECIP_ENDPOINT) ? "Endpoint" : "Unknown",
(bRequestType & USB_DIR_IN) ? "IN" : "OUT",
bRequest, wValue, wIndex, wLength);
}
static void usb_decode_ctrl_standard(char *str, size_t size, __u8 bRequestType,
__u8 bRequest, __u16 wValue, __u16 wIndex,
__u16 wLength)
{
switch (bRequest) {
case USB_REQ_GET_STATUS:
@ -272,14 +270,48 @@ const char *usb_decode_ctrl(char *str, size_t size, __u8 bRequestType,
usb_decode_set_isoch_delay(wValue, str, size);
break;
default:
snprintf(str, size, "%02x %02x %02x %02x %02x %02x %02x %02x",
bRequestType, bRequest,
(u8)(cpu_to_le16(wValue) & 0xff),
(u8)(cpu_to_le16(wValue) >> 8),
(u8)(cpu_to_le16(wIndex) & 0xff),
(u8)(cpu_to_le16(wIndex) >> 8),
(u8)(cpu_to_le16(wLength) & 0xff),
(u8)(cpu_to_le16(wLength) >> 8));
usb_decode_ctrl_generic(str, size, bRequestType, bRequest,
wValue, wIndex, wLength);
break;
}
}
/**
* usb_decode_ctrl - Returns human readable representation of control request.
* @str: buffer to return a human-readable representation of control request.
* This buffer should have about 200 bytes.
* @size: size of str buffer.
* @bRequestType: matches the USB bmRequestType field
* @bRequest: matches the USB bRequest field
* @wValue: matches the USB wValue field (CPU byte order)
* @wIndex: matches the USB wIndex field (CPU byte order)
* @wLength: matches the USB wLength field (CPU byte order)
*
* Function returns decoded, formatted and human-readable description of
* control request packet.
*
* The usage scenario for this is for tracepoints, so function as a return
* use the same value as in parameters. This approach allows to use this
* function in TP_printk
*
* Important: wValue, wIndex, wLength parameters before invoking this function
* should be processed by le16_to_cpu macro.
*/
const char *usb_decode_ctrl(char *str, size_t size, __u8 bRequestType,
__u8 bRequest, __u16 wValue, __u16 wIndex,
__u16 wLength)
{
switch (bRequestType & USB_TYPE_MASK) {
case USB_TYPE_STANDARD:
usb_decode_ctrl_standard(str, size, bRequestType, bRequest,
wValue, wIndex, wLength);
break;
case USB_TYPE_VENDOR:
case USB_TYPE_CLASS:
default:
usb_decode_ctrl_generic(str, size, bRequestType, bRequest,
wValue, wIndex, wLength);
break;
}
return str;