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XHCI: Make sure we have at least one TRB in CreateDescriptorChain.

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Linux seems to do the same thing. Confirmed as correct by korli
in #12929.
This commit is contained in:
Augustin Cavalier
2019-02-18 11:53:05 -05:00
parent b5ded9cc1a
commit db360a2064
1 changed files with 3 additions and 0 deletions
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src/add-ons/kernel/busses/usb/xhci.cpp
+3
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@@ -883,6 +883,9 @@ XHCI::CreateDescriptorChain(size_t bufferSize, int32 &trbCount)
{ {
size_t packetSize = B_PAGE_SIZE * 16; size_t packetSize = B_PAGE_SIZE * 16;
trbCount = (bufferSize + packetSize - 1) / packetSize; trbCount = (bufferSize + packetSize - 1) / packetSize;
if (trbCount == 0)
trbCount = 1;
// keep one trb for linking // keep one trb for linking
int32 tdCount = (trbCount + XHCI_MAX_TRBS_PER_TD - 2) int32 tdCount = (trbCount + XHCI_MAX_TRBS_PER_TD - 2)
/ (XHCI_MAX_TRBS_PER_TD - 1); / (XHCI_MAX_TRBS_PER_TD - 1);