5.4-stable review patch. If anyone has any objections, please let me know.
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From: Vincent Mailhol mailhol.vincent@wanadoo.fr
[ Upstream commit 0f08c2e7458e25c967d844170f8ad1aac3b57a02 ]
This is a transitional patch with the ultimate goal of changing the prototype of usb_maxpacket() from: | static inline __u16 | usb_maxpacket(struct usb_device *udev, int pipe, int is_out)
into: | static inline u16 usb_maxpacket(struct usb_device *udev, int pipe)
The third argument of usb_maxpacket(): is_out gets removed because it can be derived from its second argument: pipe using usb_pipeout(pipe). Furthermore, in the current version, ubs_pipeout(pipe) is called regardless in order to sanitize the is_out parameter.
In order to make a smooth change, we first deprecate the is_out parameter by simply ignoring it (using a variadic function) and will remove it later, once all the callers get updated.
The body of the function is reworked accordingly and is_out is replaced by usb_pipeout(pipe). The WARN_ON() calls become unnecessary and get removed.
Finally, the return type is changed from __u16 to u16 because this is not a UAPI function.
Signed-off-by: Vincent Mailhol mailhol.vincent@wanadoo.fr Link: https://lore.kernel.org/r/20220317035514.6378-2-mailhol.vincent@wanadoo.fr Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Stable-dep-of: 69aeb5073123 ("Input: pegasus-notetaker - fix potential out-of-bounds access") Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/linux/usb.h | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-)
--- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -1964,21 +1964,17 @@ usb_pipe_endpoint(struct usb_device *dev return eps[usb_pipeendpoint(pipe)]; }
-/*-------------------------------------------------------------------------*/ - -static inline __u16 -usb_maxpacket(struct usb_device *udev, int pipe, int is_out) +static inline u16 usb_maxpacket(struct usb_device *udev, int pipe, + /* int is_out deprecated */ ...) { struct usb_host_endpoint *ep; unsigned epnum = usb_pipeendpoint(pipe);
- if (is_out) { - WARN_ON(usb_pipein(pipe)); + if (usb_pipeout(pipe)) ep = udev->ep_out[epnum]; - } else { - WARN_ON(usb_pipeout(pipe)); + else ep = udev->ep_in[epnum]; - } + if (!ep) return 0;
@@ -1986,8 +1982,6 @@ usb_maxpacket(struct usb_device *udev, i return usb_endpoint_maxp(&ep->desc); }
-/* ----------------------------------------------------------------------- */ - /* translate USB error codes to codes user space understands */ static inline int usb_translate_errors(int error_code) {