[PATCH v4 07/13] net: ethernet: ti: cpts: clean up event list if event pool is empty
From: Grygorii Strashko <hidden>
Date: 2016-12-05 20:07:04
Also in:
linux-omap, lkml, netdev
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: WingMan Kwok <redacted> When a CPTS user does not exit gracefully by disabling cpts timestamping and leaving a joined multicast group, the system continues to receive and timestamps the ptp packets which eventually occupy all the event list entries. When this happns, the added code tries to remove some list entries which are expired. Signed-off-by: WingMan Kwok <redacted> Signed-off-by: Grygorii Strashko <redacted> --- drivers/net/ethernet/ti/cpts.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/ti/cpts.c b/drivers/net/ethernet/ti/cpts.c
index d3c1ac5..7ab1fa7 100644
--- a/drivers/net/ethernet/ti/cpts.c
+++ b/drivers/net/ethernet/ti/cpts.c@@ -57,6 +57,26 @@ static int cpts_fifo_pop(struct cpts *cpts, u32 *high, u32 *low) return -1; } +static int cpts_purge_events(struct cpts *cpts) +{ + struct list_head *this, *next; + struct cpts_event *event; + int removed = 0; + + list_for_each_safe(this, next, &cpts->events) { + event = list_entry(this, struct cpts_event, list); + if (event_expired(event)) { + list_del_init(&event->list); + list_add(&event->list, &cpts->pool); + ++removed; + } + } + + if (removed) + pr_debug("cpts: event pool cleaned up %d\n", removed); + return removed ? 0 : -1; +} + /* * Returns zero if matching event type was found. */
@@ -69,10 +89,12 @@ static int cpts_fifo_read(struct cpts *cpts, int match) for (i = 0; i < CPTS_FIFO_DEPTH; i++) { if (cpts_fifo_pop(cpts, &hi, &lo)) break; - if (list_empty(&cpts->pool)) { - pr_err("cpts: event pool is empty\n"); + + if (list_empty(&cpts->pool) && cpts_purge_events(cpts)) { + pr_err("cpts: event pool empty\n"); return -1; } + event = list_first_entry(&cpts->pool, struct cpts_event, list); event->tmo = jiffies + 2; event->high = hi;
--
2.10.1
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