mirror of https://github.com/acidanthera/audk.git
a52044a9e6
Searching for an unused bounce buffer in mReservedMemBitmap and reserving the buffer by flipping the bit is a critical section which must not be interrupted. Raise the TPL level to ensure that. Without this fix it can happen that IoMmuDxe hands out the same bounce buffer twice, causing trouble down the road. Seen happening in practice with VirtioNetDxe setting up the network interface (and calling into IoMmuDxe from a polling timer callback) in parallel with Boot Manager doing some disk I/O. An ASSERT() in VirtioNet caught the buffer inconsistency. Full story with lots of details and discussions is available here: https://bugzilla.redhat.com/show_bug.cgi?id=2211060 Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> |
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| .. | ||
| CcIoMmu.c | ||
| CcIoMmu.h | ||
| IoMmuBuffer.c | ||
| IoMmuDxe.c | ||
| IoMmuDxe.inf | ||
| IoMmuInternal.h | ||