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authorRobert Schedel <r.schedel@yahoo.de>2008-05-03 12:58:36 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2008-05-14 02:54:02 -0300
commit71a35fe2a345eb3704e1f1b4da65451d3e2b8c2e (patch)
tree5222b0da35875a3351af2990f333a181030a09c9 /drivers/media/dvb/dvb-core
parentfa146c6dceffa68fa12f8d0b797ab9753fa1c792 (diff)
V4L/DVB (7830): dvb_ca_en50221: Fix High CPU load in 'top' due to budget_av slot polling
This change addresses kernel bug #10459: In kernel 2.6.25 the budget_av driver polls for an CI slot in 100ms intervals (because no interrupt solution for budget_av cards is feasible due to HW reasons). If no CI/CAM is connected to the DVB card, polling times out only after 250ms. This periodic polling leads to high CPU load. The change increases the polling interval for empty slots from 100ms to 5s. Intervals for remaining slot states (invalid, in progress, ready) are unchanged, as they are either temporary conditions or no timeout should occur. Signed-off-by: Robert Schedel <r.schedel@yahoo.de> Signed-off-by: Oliver Endriss <o.endriss@gmx.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media/dvb/dvb-core')
-rw-r--r--drivers/media/dvb/dvb-core/dvb_ca_en50221.c28
1 files changed, 16 insertions, 12 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb/dvb-core/dvb_ca_en50221.c
index 8cbdb0ec67e..588fbe105c2 100644
--- a/drivers/media/dvb/dvb-core/dvb_ca_en50221.c
+++ b/drivers/media/dvb/dvb-core/dvb_ca_en50221.c
@@ -910,15 +910,21 @@ static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
int curdelay = 100000000;
int slot;
+ /* Beware of too high polling frequency, because one polling
+ * call might take several hundred milliseconds until timeout!
+ */
for (slot = 0; slot < ca->slot_count; slot++) {
switch (ca->slot_info[slot].slot_state) {
default:
case DVB_CA_SLOTSTATE_NONE:
+ delay = HZ * 60; /* 60s */
+ if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
+ delay = HZ * 5; /* 5s */
+ break;
case DVB_CA_SLOTSTATE_INVALID:
- delay = HZ * 60;
- if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) {
- delay = HZ / 10;
- }
+ delay = HZ * 60; /* 60s */
+ if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
+ delay = HZ / 10; /* 100ms */
break;
case DVB_CA_SLOTSTATE_UNINITIALISED:
@@ -926,19 +932,17 @@ static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
case DVB_CA_SLOTSTATE_VALIDATE:
case DVB_CA_SLOTSTATE_WAITFR:
case DVB_CA_SLOTSTATE_LINKINIT:
- delay = HZ / 10;
+ delay = HZ / 10; /* 100ms */
break;
case DVB_CA_SLOTSTATE_RUNNING:
- delay = HZ * 60;
- if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) {
- delay = HZ / 10;
- }
+ delay = HZ * 60; /* 60s */
+ if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
+ delay = HZ / 10; /* 100ms */
if (ca->open) {
if ((!ca->slot_info[slot].da_irq_supported) ||
- (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) {
- delay = HZ / 10;
- }
+ (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
+ delay = HZ / 10; /* 100ms */
}
break;
}