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SubjectRe: [PATCH] usb: host: ehci-sched: add comment about find_tt() not returning error
On Sun, Oct 11, 2020 at 09:50:08PM +0100, Sudip Mukherjee wrote:
> Add a comment explaining why find_tt() will not return error even though
> find_tt() is checking for NULL and other errors.
>
> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
> ---
> drivers/usb/host/ehci-sched.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
> index 6dfb242f9a4b..0f85aa9b2fb1 100644
> --- a/drivers/usb/host/ehci-sched.c
> +++ b/drivers/usb/host/ehci-sched.c
> @@ -244,6 +244,12 @@ static void reserve_release_intr_bandwidth(struct ehci_hcd *ehci,
>
> /* FS/LS bus bandwidth */
> if (tt_usecs) {
> + /*
> + * find_tt() will not return any error here as we have
> + * already called find_tt() before calling this function
> + * and checked for any error return. The previous call
> + * would have created the data structure.
> + */
> tt = find_tt(qh->ps.udev);
> if (sign > 0)
> list_add_tail(&qh->ps.ps_list, &tt->ps_list);
> @@ -1337,6 +1343,12 @@ static void reserve_release_iso_bandwidth(struct ehci_hcd *ehci,
> }
> }
>
> + /*
> + * find_tt() will not return any error here as we have
> + * already called find_tt() before calling this function
> + * and checked for any error return. The previous call
> + * would have created the data structure.
> + */
> tt = find_tt(stream->ps.udev);
> if (sign > 0)
> list_add_tail(&stream->ps.ps_list, &tt->ps_list);

Acked-by: Alan Stern <stern@rowland.harvard.edu>

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