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use locking when messing ITD and SITD queues. itd->prev was becoming NULL, thus leading to KDL.

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42575 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Jérôme Duval 2011-08-04 21:52:03 +00:00
parent 77f593de38
commit 0839540d1e
1 changed files with 8 additions and 0 deletions
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8
src/add-ons/kernel/busses/usb/ehci.cpp
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@ -2243,6 +2243,7 @@ EHCI::LinkDescriptors(ehci_qtd *first, ehci_qtd *last, ehci_qtd *alt)
void
EHCI::LinkITDescriptors(ehci_itd *itd, ehci_itd **_last)
{
LockIsochronous();
ehci_itd *last = *_last;
itd->next_phy = last->next_phy;
itd->next = NULL;
@ -2250,12 +2251,14 @@ EHCI::LinkITDescriptors(ehci_itd *itd, ehci_itd **_last)
last->next = itd;
last->next_phy = itd->this_phy;
*_last = itd;
UnlockIsochronous();
}
void
EHCI::LinkSITDescriptors(ehci_sitd *sitd, ehci_sitd **_last)
{
LockIsochronous();
ehci_sitd *last = *_last;
sitd->next_phy = last->next_phy;
sitd->next = NULL;
@ -2263,29 +2266,34 @@ EHCI::LinkSITDescriptors(ehci_sitd *sitd, ehci_sitd **_last)
last->next = sitd;
last->next_phy = sitd->this_phy;
*_last = sitd;
UnlockIsochronous();
}
void
EHCI::UnlinkITDescriptors(ehci_itd *itd, ehci_itd **last)
{
LockIsochronous();
itd->prev->next_phy = itd->next_phy;
itd->prev->next = itd->next;
if (itd->next != NULL)
itd->next->prev = itd->prev;
if (itd == *last)
*last = itd->prev;
UnlockIsochronous();
}
void
EHCI::UnlinkSITDescriptors(ehci_sitd *sitd, ehci_sitd **last)
{
LockIsochronous();
sitd->prev->next_phy = sitd->next_phy;
sitd->prev->next = sitd->next;
if (sitd->next != NULL)
sitd->next->prev = sitd->prev;
if (sitd == *last)
*last = sitd->prev;
UnlockIsochronous();
}