| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <200906181423.11245.herton@mandriva.com.br>
Date: Thu, 18 Jun 2009 14:23:09 -0300
From: Herton Ronaldo Krzesinski <herton@...driva.com.br>
To: fmhess@...rs.sourceforge.net
Cc: Ian Abbott <abbotti@....co.uk>, Greg KH <gregkh@...e.de>,
LKML <linux-kernel@...r.kernel.org>,
Gianluca Palli <gpalli@...s.unibo.it>,
David Schleef <ds@...leef.org>
Subject: Re: staging driver s626 clashes with philips SAA7146 media/dvb based cards
Em Quinta-feira 18 Junho 2009, às 04:28:04, Frank Mori Hess escreveu:
> On Wednesday 17 June 2009, Herton Ronaldo Krzesinski wrote:
> > >
> > > Your patch breaks configuration of the board unless the bus and slot
> > > are explicitly specified. Just make a minimal patch that replaces
> > > pci_get_device with pci_get_subsys and fixes the problem that was
> > > reported.
> >
> > Hmm that's not what the patch does, it doesn't break configuration,
> > keeps the same logic as before (I was wrong in my last email replying to
> > myself), check it, if it->options[0] and it->options[1] isn't specified,
> > the pdev is valid so the for loop exits (see !pdev check).
>
> Your right. However, it also turns a loop over pci devices into a loop
> over pci ids, which appears to break the case of multiple s626 boards
> where the bus/slot of the second s626 board is specified. If you're not
> willing to provide a minimal patch that just fixes the reported problem,
> just say so. It would have been less effort for me to do it myself than
> analyze what your changes are breaking.
That's part of reviewing process, I just wanted to enhance it in case more pci
ids are added in the future along with the switch to pci_get_subsys, I don't
know why you act like that, you don't want the code to be enhanced? Other
comedi driver loop over ids, for example gsc_hpdi
And indeed what you say it's true, there is a bug in the patch now that you
checked it out properly, it has a problem with this multiple s626 case, fixed
that now. Pointing out the problem instead just saying it's broken helps :)
I also removed the obligation to add sub ids and re-factored the patch, that
was too much and not good, just a simpler loop over pci id array is used now,
and a comment was added in pci id list telling people that they should add
subvendor:subdevice ids for boards with vendor:device == 0x1131:0x7146,
in case new boards with this id appear.
Let me know if there is any problem remaining with this version:
Staging: comedi: s626: use subvendor:subdevice ids for SAA7146 board
The current s626 comedi driver in staging conflicts with philips SAA7146
media/dvb based cards, because it claims the same vendor:device pci id
for all subdevice/subvendor ids. What happens is that for people that have a
philips SAA7146 media/dvb based card, s626 if available gets loaded by udev
and makes system freeze (https://qa.mandriva.com/show_bug.cgi?id=51445).
The s626 driver shouldn't claim all 1131:7146 devices. Fix this by
specifying specific known subvendor:subdevice ids in its pci id table
list.
Also s626_attach is modified to use now pci_get_subsys instead of
pci_get_device as reported by Ian Abbott, and now we loop over pci id
table entries in case more ids are added in the future.
Reference: http://lkml.org/lkml/2009/6/16/552
Signed-off-by: Herton Ronaldo Krzesinski <herton@...driva.com.br>
diff --git a/drivers/staging/comedi/drivers/s626.c b/drivers/staging/comedi/drivers/s626.c
index 30dec9d..4210590 100644
--- a/drivers/staging/comedi/drivers/s626.c
+++ b/drivers/staging/comedi/drivers/s626.c
@@ -110,9 +110,13 @@ static const struct s626_board s626_boards[] = {
#define PCI_VENDOR_ID_S626 0x1131
#define PCI_DEVICE_ID_S626 0x7146
+/*
+ * For devices with vendor:device id == 0x1131:0x7146 you must specify
+ * also subvendor:subdevice ids, because otherwise it will conflict with
+ * Philips SAA7146 media/dvb based cards.
+ */
static DEFINE_PCI_DEVICE_TABLE(s626_pci_table) = {
- {PCI_VENDOR_ID_S626, PCI_DEVICE_ID_S626, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
- 0},
+ {PCI_VENDOR_ID_S626, PCI_DEVICE_ID_S626, 0x6000, 0x0272, 0, 0, 0},
{0}
};
@@ -498,25 +502,26 @@ static int s626_attach(struct comedi_device *dev, struct comedi_devconfig *it)
resource_size_t resourceStart;
dma_addr_t appdma;
struct comedi_subdevice *s;
- struct pci_dev *pdev;
+ const struct pci_device_id *ids;
+ struct pci_dev *pdev = NULL;
if (alloc_private(dev, sizeof(struct s626_private)) < 0)
return -ENOMEM;
- for (pdev = pci_get_device(PCI_VENDOR_ID_S626, PCI_DEVICE_ID_S626,
- NULL); pdev != NULL;
- pdev = pci_get_device(PCI_VENDOR_ID_S626,
- PCI_DEVICE_ID_S626, pdev)) {
- if (it->options[0] || it->options[1]) {
- if (pdev->bus->number == it->options[0] &&
- PCI_SLOT(pdev->devfn) == it->options[1]) {
+ for (i = 0; i < ARRAY_SIZE(s626_pci_table) && !pdev; i++) {
+ ids = &s626_pci_table[i];
+ do {
+ pdev = pci_get_subsys(ids->vendor, ids->device, ids->subvendor,
+ ids->subdevice, pdev);
+
+ if ((it->options[0] || it->options[1]) && pdev) {
/* matches requested bus/slot */
+ if (pdev->bus->number == it->options[0] &&
+ PCI_SLOT(pdev->devfn) == it->options[1])
+ break;
+ } else
break;
- }
- } else {
- /* no bus/slot specified */
- break;
- }
+ } while (1);
}
devpriv->pdev = pdev;
--
[]'s
Herton
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists