On Tue, May 26, 2009 at 2:42 PM, Samuel Ortiz <sameo@xxxxxxxxxxxxxxx> wrote:
> On Tue, May 26, 2009 at 02:32:45PM -0400, Michael Krufky wrote:
>> On Tue, May 26, 2009 at 1:40 PM, Samuel Ortiz <sameo@xxxxxxxxxxxxxxx> wrote:
>> > From: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
>> > To: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxx>
>> >
>> > We're going to remove the FIRMWARE_NAME_MAX definition in order to avoid any
>> > firmware name length restriction.
>> > This patch changes the dvb_usb_device_properties firmware field accordingly.
>> >
>> > Signed-off-by: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
>> >
>> > ---
>> > drivers/media/dvb/dvb-usb/dvb-usb.h | 2 +-
>> > 1 file changed, 1 insertion(+), 1 deletion(-)
>> >
>> > Index: iwm-2.6/drivers/media/dvb/dvb-usb/dvb-usb.h
>> > ===================================================================
>> > --- iwm-2.6.orig/drivers/media/dvb/dvb-usb/dvb-usb.h 2009-05-26 17:24:36.000000000 +0200
>> > +++ iwm-2.6/drivers/media/dvb/dvb-usb/dvb-usb.h 2009-05-26 17:25:19.000000000 +0200
>> > @@ -196,7 +196,7 @@ struct dvb_usb_device_properties {
>> > #define CYPRESS_FX2 3
>> > int usb_ctrl;
>> > int (*download_firmware) (struct usb_device *, const struct firmware *);
>> > - const char firmware[FIRMWARE_NAME_MAX];
>> > + const char *firmware;
>> > int no_reconnect;
>> >
>> > int size_of_priv;
>> >
>> > --
>> > Intel Open Source Technology Centre
>> > http://oss.intel.com/
>> > --
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>> >
>>
>> Samuel,
>>
>> Your patch makes the following change:
>>
>> - const char firmware[FIRMWARE_NAME_MAX];
>> + const char *firmware;
>>
>> Before your change, struct dvb_usb_device_properties actually contains
>> memory allocated for the firmware filename. After your change, this
>> is nothing but a pointer.
>>
>> This will cause an OOPS.
> No, not if it's correctly initialized, as it seems to be for all the
> dvb_usb_device_properties users right now.
> Typically, you'd initialize your dvb_usb_device_properties like this:
>
> static struct dvb_usb_device_properties a800_properties = {
> .caps = DVB_USB_IS_AN_I2C_ADAPTER,
>
> .usb_ctrl = CYPRESS_FX2,
> .firmware = "dvb-usb-avertv-a800-02.fw",
> [...]
>
> And that's fine.
You're right -- there is nothing wrong with the change -- my bad.
I traced though the code after posting that last mail. It looked
risky when I just looked at the patch, but in the end this is actually
cleaner and much better.
Sorry for the noise.
Acked /
Reviewed-by: Michael Krufky <mkrufky@xxxxxxxxxxxxxx>
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