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authorKarsten Keil <kkeil@linux-pingi.de>2012-05-15 23:51:08 +0000
committerDavid S. Miller <davem@davemloft.net>2012-05-16 15:24:36 -0400
commitc27b46e7f1cbf3be95a4cf5840c76a7b7d54b26f (patch)
treedb406c5ceb174b3b41a0085929fe85c5e6951bb6 /drivers/isdn/mISDN/hwchannel.c
parent6d1ee48fd0d8d2586aaeda24dacffc426c2be44a (diff)
downloadlinux-c27b46e7f1cbf3be95a4cf5840c76a7b7d54b26f.tar.bz2
mISDN: Implement MISDN_CTRL_RX_OFF for more drivers
MISDN_CTRL_RX_OFF is a meachanism to discard RX data in the driver if the data is not needed by the application. It can be used when playing mesages, but not recording or with unidirectional protocols. Signed-off-by: Karsten Keil <kkeil@linux-pingi.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn/mISDN/hwchannel.c')
-rw-r--r--drivers/isdn/mISDN/hwchannel.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/isdn/mISDN/hwchannel.c b/drivers/isdn/mISDN/hwchannel.c
index e541b65f68ba..ef34fd40867c 100644
--- a/drivers/isdn/mISDN/hwchannel.c
+++ b/drivers/isdn/mISDN/hwchannel.c
@@ -142,6 +142,8 @@ mISDN_clear_bchannel(struct bchannel *ch)
test_and_clear_bit(FLG_ACTIVE, &ch->Flags);
test_and_clear_bit(FLG_FILLEMPTY, &ch->Flags);
test_and_clear_bit(FLG_TX_EMPTY, &ch->Flags);
+ test_and_clear_bit(FLG_RX_OFF, &ch->Flags);
+ ch->dropcnt = 0;
ch->minlen = ch->init_minlen;
ch->next_minlen = ch->init_minlen;
ch->maxlen = ch->init_maxlen;
@@ -167,7 +169,8 @@ mISDN_ctrl_bchannel(struct bchannel *bch, struct mISDN_ctrl_req *cq)
switch (cq->op) {
case MISDN_CTRL_GETOP:
- cq->op = MISDN_CTRL_RX_BUFFER | MISDN_CTRL_FILL_EMPTY;
+ cq->op = MISDN_CTRL_RX_BUFFER | MISDN_CTRL_FILL_EMPTY |
+ MISDN_CTRL_RX_OFF;
break;
case MISDN_CTRL_FILL_EMPTY:
if (cq->p1) {
@@ -177,6 +180,15 @@ mISDN_ctrl_bchannel(struct bchannel *bch, struct mISDN_ctrl_req *cq)
test_and_clear_bit(FLG_FILLEMPTY, &bch->Flags);
}
break;
+ case MISDN_CTRL_RX_OFF:
+ /* read back dropped byte count */
+ cq->p2 = bch->dropcnt;
+ if (cq->p1)
+ test_and_set_bit(FLG_RX_OFF, &bch->Flags);
+ else
+ test_and_clear_bit(FLG_RX_OFF, &bch->Flags);
+ bch->dropcnt = 0;
+ break;
case MISDN_CTRL_RX_BUFFER:
if (cq->p2 > MISDN_CTRL_RX_SIZE_IGNORE)
bch->next_maxlen = cq->p2;