Fixes queue wrapping bug in Inbound Doorbell handling routine.
Signed-off-by: Alexandre Bounine <alexandre.boun...@idt.com>
Cc: Chul Kim <chul....@idt.com>
Cc: Matt Porter <mpor...@kernel.crashing.org>
---
This patch is applicable to kernel version 3.2 and after.
drivers/rapidio/devices/tsi721.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/rapidio/devices/tsi721.c b/drivers/rapidio/devices/tsi721.c
index babbede..c746e26 100644
--- a/drivers/rapidio/devices/tsi721.c
+++ b/drivers/rapidio/devices/tsi721.c
@@ -406,13 +406,14 @@ static void tsi721_db_dpc(struct work_struct *work)
*/
mport = priv->mport;
- wr_ptr = ioread32(priv->regs + TSI721_IDQ_WP(IDB_QUEUE));
- rd_ptr = ioread32(priv->regs + TSI721_IDQ_RP(IDB_QUEUE));
+ wr_ptr = ioread32(priv->regs + TSI721_IDQ_WP(IDB_QUEUE)) % IDB_QSIZE;
+ rd_ptr = ioread32(priv->regs + TSI721_IDQ_RP(IDB_QUEUE)) % IDB_QSIZE;
while (wr_ptr != rd_ptr) {
idb_entry = (u64 *)(priv->idb_base +
(TSI721_IDB_ENTRY_SIZE * rd_ptr));
rd_ptr++;
+ rd_ptr %= IDB_QSIZE;
idb.msg = *idb_entry;
*idb_entry = 0;
--
1.7.8.4
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