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usb: host: ehci-sched: add comment about find_tt() not returning error
Add a comment explaining why find_tt() will not return error even though find_tt() is checking for NULL and other errors. Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Link: https://lore.kernel.org/r/20201011205008.24369-1-sudipm.mukherjee@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -244,6 +244,12 @@ static void reserve_release_intr_bandwidth(struct ehci_hcd *ehci,
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/* FS/LS bus bandwidth */
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/* FS/LS bus bandwidth */
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if (tt_usecs) {
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if (tt_usecs) {
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/*
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* find_tt() will not return any error here as we have
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* already called find_tt() before calling this function
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* and checked for any error return. The previous call
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* would have created the data structure.
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*/
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tt = find_tt(qh->ps.udev);
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tt = find_tt(qh->ps.udev);
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if (sign > 0)
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if (sign > 0)
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list_add_tail(&qh->ps.ps_list, &tt->ps_list);
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list_add_tail(&qh->ps.ps_list, &tt->ps_list);
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@ -1337,6 +1343,12 @@ static void reserve_release_iso_bandwidth(struct ehci_hcd *ehci,
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}
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}
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}
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}
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/*
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* find_tt() will not return any error here as we have
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* already called find_tt() before calling this function
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* and checked for any error return. The previous call
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* would have created the data structure.
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*/
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tt = find_tt(stream->ps.udev);
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tt = find_tt(stream->ps.udev);
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if (sign > 0)
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if (sign > 0)
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list_add_tail(&stream->ps.ps_list, &tt->ps_list);
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list_add_tail(&stream->ps.ps_list, &tt->ps_list);
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