On Fri, Aug 02, 2024 at 02:04:27PM +0000, Tudor Ambarus wrote:
> The blamed commit made ffs_func_disable() always return -EINVAL as the
> method calls ffs_func_set_alt() with the ``alt`` argument being
> ``(unsigned)-1``, which is always greater than MAX_ALT_SETTINGS.
> Use the MAX_ALT_SETTINGS check just in the f->set_alt() code path,
> f->disable() doesn't care about the ``alt`` parameter.
>
> Make a surgical fix, but really the f->disable() code shall be pulled
> out from ffs_func_set_alt(), the code will become clearer. A patch will
> follow.
>
> Note that ffs_func_disable() always returning -EINVAL made pixel6 crash
> on USB disconnect.
>
> Fixes: 2f550553e23c ("usb: gadget: f_fs: Add the missing get_alt callback")
> Reported-by: William McVicker <willmcvicker@xxxxxxxxxx>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>
> ---
> drivers/usb/gadget/function/f_fs.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
> index d8b096859337..0bfed1741b3e 100644
> --- a/drivers/usb/gadget/function/f_fs.c
> +++ b/drivers/usb/gadget/function/f_fs.c
> @@ -3731,10 +3731,10 @@ static int ffs_func_set_alt(struct usb_function *f,
> struct ffs_data *ffs = func->ffs;
> int ret = 0, intf;
>
> - if (alt > MAX_ALT_SETTINGS)
> - return -EINVAL;
> -
> if (alt != (unsigned)-1) {
> + if (alt > MAX_ALT_SETTINGS)
> + return -EINVAL;
> +
> intf = ffs_func_revmap_intf(func, interface);
> if (intf < 0)
> return intf;
> --
> 2.46.0.rc2.264.g509ed76dc8-goog
>
>
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
a patch that has triggered this response. He used to manually respond
to these common problems, but in order to save his sanity (he kept
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