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usb: xhci: address off-by-one in xhci_num_trbs_free()

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Reduce the number of do-while loops by 1. The number of loops should be
number of segment + 1, the +1 is in case deq and enq are on the same
segment. But due to the use of a do-while loop, the expression is
evaluated after executing the loop, thus the loop is executed 1 extra
time.

Changing the do-while loop expression from "<=" to "<", reduces the loop
amount by 1. The expression "<=" would also work if it was a while loop
instead of a do-while loop.

Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20240429140245.3955523-6-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Niklas Neronin 2024-04-29 17:02:32 +03:00 committed by Greg Kroah-Hartman
parent 577c867cf8
commit 5adc1cc038
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/host/xhci-ring.c
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@ -308,7 +308,7 @@ static unsigned int xhci_num_trbs_free(struct xhci_hcd *xhci, struct xhci_ring *
free += last_on_seg - enq;
enq_seg = enq_seg->next;
enq = enq_seg->trbs;
} while (i++ <= ring->num_segs);
} while (i++ < ring->num_segs);
return free;
}