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authorMike Frysinger <vapier@gentoo.org>2011-04-04 11:26:11 -0400
committerMike Frysinger <vapier@gentoo.org>2011-04-13 19:34:05 -0400
commit0bf02ce605b8780223b10739ab7c533de9eb10cc (patch)
tree2a7c66fa16817062979648dd434f9067f279c5a2 /arch
parentce24ee468aabb7c499b910aa3c4ab3cb338326ed (diff)
Blackfin: time-ts: ack gptimer sooner to avoid missing short ints
If the period of a gptimer is fairly low, we might miss an interrupt by acking it too late (we end up acking the new int as well). Reported-by: Isabelle Leonardi <i.leonardi@detracom.fr> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/blackfin/kernel/time-ts.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/blackfin/kernel/time-ts.c b/arch/blackfin/kernel/time-ts.c
index 8c9a43daf80f..cdb4beb6bc8f 100644
--- a/arch/blackfin/kernel/time-ts.c
+++ b/arch/blackfin/kernel/time-ts.c
@@ -206,8 +206,14 @@ irqreturn_t bfin_gptmr0_interrupt(int irq, void *dev_id)
206{ 206{
207 struct clock_event_device *evt = dev_id; 207 struct clock_event_device *evt = dev_id;
208 smp_mb(); 208 smp_mb();
209 evt->event_handler(evt); 209 /*
210 * We want to ACK before we handle so that we can handle smaller timer
211 * intervals. This way if the timer expires again while we're handling
212 * things, we're more likely to see that 2nd int rather than swallowing
213 * it by ACKing the int at the end of this handler.
214 */
210 bfin_gptmr0_ack(); 215 bfin_gptmr0_ack();
216 evt->event_handler(evt);
211 return IRQ_HANDLED; 217 return IRQ_HANDLED;
212} 218}
213 219