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Fix delete delete hang on serial ports

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Found the issue where it was freeing transfers from the follow up list, that were also on the QH list which also tried to free it again.

Fix was in the first free list, it checks to see if the item is also in the qh list and does not free it then.
This commit is contained in:
Kurt Eckhardt 2017-11-11 09:56:46 -08:00
parent 4eee8627d2
commit ca070ebcd4
1 changed files with 30 additions and 1 deletions
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31
ehci.cpp
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@ -1252,12 +1252,38 @@ void USBHost::delete_Pipe(Pipe_t *pipe)
// TODO: does this write interfere UPI & UAI (bits 18 & 19) ??
}
// find & free all the transfers which completed
println(" Free transfers");
Transfer_t *t = async_followup_first;
#if 0
if (t) {
println(" (Look at QH list first)");
Transfer_t *tr = (Transfer_t *)(pipe->qh.next);
while ((uint32_t)tr & 0xFFFFFFE0) {
println(" $ ", (uint32_t)tr);
tr = (Transfer_t *)(tr->qtd.next);
}
}
#endif
while (t) {
print(" * ", (uint32_t)t);
Transfer_t *next = t->next_followup;
if (t->pipe == pipe) {
print(" * remove");
remove_from_async_followup_list(t);
free_Transfer(t);
// Only free if not in QH list
Transfer_t *tr = (Transfer_t *)(pipe->qh.next);
while (((uint32_t)tr & 0xFFFFFFE0) && (tr != t)){
tr = (Transfer_t *)(tr->qtd.next);
}
if (tr == t) {
println(" * defer free until QH");
} else {
println(" * free");
free_Transfer(t); // The later code should actually free it...
}
} else {
println("");
}
t = next;
}
@ -1300,14 +1326,17 @@ void USBHost::delete_Pipe(Pipe_t *pipe)
// TODO: do we need to look at pipe->qh.current ??
//
// free all the transfers still attached to the QH
println(" Free transfers attached to QH");
Transfer_t *tr = (Transfer_t *)(pipe->qh.next);
while ((uint32_t)tr & 0xFFFFFFE0) {
println(" * ", (uint32_t)tr);
Transfer_t *next = (Transfer_t *)(tr->qtd.next);
free_Transfer(tr);
tr = next;
}
// hopefully we found everything...
free_Pipe(pipe);
println("* Delete Pipe completed");
}