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pps: events reporting fix up 

PPS events must be recorded according to PPS's mode settings.

If a process asks for (i.e.) capture-assert events only, when the PPS
client calls the pps_event() function to save the current PPS event, we
should verify the event type and then discard unwanted ones.

Also, without this patch userland processes waiting for a specific PPS
event (assert or clear but not both) may be awakened at wrong time.

Signed-off-by: Rodolfo Giometti <giometti@linux.it>
Tested-by: William S. Brasher <billb958@door.net>
Tested-by: Reg Clemens <clemens@dwf.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rodolfo Giometti 2009-11-11 14:26:54 -08:00 committed by Linus Torvalds
parent cbf83cc5a2
commit 276b282e90
1 changed files with 15 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/pps/kapi.c
View File

@ -271,6 +271,7 @@ void pps_event(int source, struct pps_ktime *ts, int event, void *data)
{
struct pps_device *pps;
unsigned long flags;
int captured = 0;
if ((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) == 0) {
printk(KERN_ERR "pps: unknown event (%x) for source %d\n",
@ -293,7 +294,8 @@ void pps_event(int source, struct pps_ktime *ts, int event, void *data)
/* Check the event */
pps->current_mode = pps->params.mode;
if (event & PPS_CAPTUREASSERT) {
if ((event & PPS_CAPTUREASSERT) &
(pps->params.mode & PPS_CAPTUREASSERT)) {
/* We have to add an offset? */
if (pps->params.mode & PPS_OFFSETASSERT)
pps_add_offset(ts, &pps->params.assert_off_tu);
@ -303,8 +305,11 @@ void pps_event(int source, struct pps_ktime *ts, int event, void *data)
pps->assert_sequence++;
pr_debug("capture assert seq #%u for source %d\n",
pps->assert_sequence, source);
captured = ~0;
}
if (event & PPS_CAPTURECLEAR) {
if ((event & PPS_CAPTURECLEAR) &
(pps->params.mode & PPS_CAPTURECLEAR)) {
/* We have to add an offset? */
if (pps->params.mode & PPS_OFFSETCLEAR)
pps_add_offset(ts, &pps->params.clear_off_tu);
@ -314,12 +319,17 @@ void pps_event(int source, struct pps_ktime *ts, int event, void *data)
pps->clear_sequence++;
pr_debug("capture clear seq #%u for source %d\n",
pps->clear_sequence, source);
captured = ~0;
}
/* Wake up iif captured somthing */
if (captured) {
pps->go = ~0;
wake_up_interruptible(&pps->queue);
kill_fasync(&pps->async_queue, SIGIO, POLL_IN);
}
spin_unlock_irqrestore(&pps->lock, flags);