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[ISDN] capidrv: address two longstanding warnings 

* change #warning to a code comment

* add comment and special ifdef'd 64-bit code for a situation where
  we must store a pointer into a CAPI field 'Data', which is fixed by
  the interface at 32 bits.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Acked-by: Karsten Keil <kkeil@suse.de>
This commit is contained in:
Jeff Garzik 2007-10-25 23:02:14 -04:00
parent 2a397e82c7
commit b393243fe7
1 changed files with 23 additions and 2 deletions
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25
drivers/isdn/capi/capidrv.c
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@ -1843,6 +1843,7 @@ static int if_sendbuf(int id, int channel, int doack, struct sk_buff *skb)
int msglen;
u16 errcode;
u16 datahandle;
u32 data;
if (!card) {
printk(KERN_ERR "capidrv: if_sendbuf called with invalid driverId %d!\n",
@ -1860,9 +1861,26 @@ static int if_sendbuf(int id, int channel, int doack, struct sk_buff *skb)
return 0;
}
datahandle = nccip->datahandle;
/*
* Here we copy pointer skb->data into the 32-bit 'Data' field.
* The 'Data' field is not used in practice in linux kernel
* (neither in 32 or 64 bit), but should have some value,
* since a CAPI message trace will display it.
*
* The correct value in the 32 bit case is the address of the
* data, in 64 bit it makes no sense, we use 0 there.
*/
#ifdef CONFIG_64BIT
data = 0;
#else
data = (unsigned long) skb->data;
#endif
capi_fill_DATA_B3_REQ(&sendcmsg, global.ap.applid, card->msgid++,
nccip->ncci, /* adr */
(u32) skb->data, /* Data */
data, /* Data */
skb->len, /* DataLength */
datahandle, /* DataHandle */
0 /* Flags */
@ -2123,7 +2141,10 @@ static int capidrv_delcontr(u16 contr)
printk(KERN_ERR "capidrv: delcontr: no contr %u\n", contr);
return -1;
}
#warning FIXME: maybe a race condition the card should be removed here from global list /kkeil
/* FIXME: maybe a race condition the card should be removed
* here from global list /kkeil
*/
spin_unlock_irqrestore(&global_lock, flags);
del_timer(&card->listentimer);