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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>
This commit is contained in:
Sudip Mukherjee 2020-10-11 21:50:08 +01:00 committed by Greg Kroah-Hartman
parent 3650b228f8
commit 23eac8531a
1 changed files with 12 additions and 0 deletions
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12
drivers/usb/host/ehci-sched.c
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@ -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);