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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2010-02-21 19:58:52 +0300 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2010-02-24 22:36:55 +0300 |
| commit | 4802f16d512d6e3b36177709d50c05df0ef52a6c (patch) | |
| tree | 3d46d5088d41b8e38e7601a1a37c676d54270fe2 /drivers/firewire/ohci.c | |
| parent | 3e9cc2f3b7ddabbbfc9abd043887030c669380aa (diff) | |
| download | linux-4802f16d512d6e3b36177709d50c05df0ef52a6c.tar.xz | |
firewire: ohci: fix IR/IT context mask mixup
This bug was present in firewire-ohci since day one: The number of
available isochronous receive DMA contexts was mixed up with that of
available isochronous transmit DMA contexts.
This is harmless on a few chips which offer the same number of contexts
in both directions, but most chips nowadays implement only the standard
minimum of 4 IR contexts, but 8 IT contexts. If a user attempted to run
a lot of IR contexts at once, results with more than four were therefore
unpredictable. I suppose the controller would simply refuse to start
DMA of any unimplemented context.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/ohci.c')
| -rw-r--r-- | drivers/firewire/ohci.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 9815137b7c7d..a387bcd62466 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -2395,17 +2395,17 @@ static int __devinit pci_probe(struct pci_dev *dev, OHCI1394_AsRspTrContextControlSet, handle_at_packet); reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, ~0); - ohci->it_context_mask = reg_read(ohci, OHCI1394_IsoRecvIntMaskSet); + ohci->ir_context_channels = ~0ULL; + ohci->ir_context_mask = reg_read(ohci, OHCI1394_IsoRecvIntMaskSet); reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, ~0); - size = sizeof(struct iso_context) * hweight32(ohci->it_context_mask); - ohci->it_context_list = kzalloc(size, GFP_KERNEL); + size = sizeof(struct iso_context) * hweight32(ohci->ir_context_mask); + ohci->ir_context_list = kzalloc(size, GFP_KERNEL); reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, ~0); - ohci->ir_context_channels = ~0ULL; - ohci->ir_context_mask = reg_read(ohci, OHCI1394_IsoXmitIntMaskSet); + ohci->it_context_mask = reg_read(ohci, OHCI1394_IsoXmitIntMaskSet); reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, ~0); - size = sizeof(struct iso_context) * hweight32(ohci->ir_context_mask); - ohci->ir_context_list = kzalloc(size, GFP_KERNEL); + size = sizeof(struct iso_context) * hweight32(ohci->it_context_mask); + ohci->it_context_list = kzalloc(size, GFP_KERNEL); if (ohci->it_context_list == NULL || ohci->ir_context_list == NULL) { err = -ENOMEM; |