The patch titled
Subject: rapidio/tsi721: fix queue wrapping bug in inbound doorbell handler
has been removed from the -mm tree. Its filename was
rapidio-tsi721-fix-bug-in-inbound-doorbell-handler.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
From: Alexandre Bounine <alexandre.boun...@idt.com>
Subject: rapidio/tsi721: fix queue wrapping bug in inbound doorbell handler
Fix a bug that causes a kernel panic when the number of received doorbells
is larger than number of entries in the inbound doorbell queue (current
default value = 512).
Another possible indication for this bug is large number of spurious
doorbells reported by tsi721 driver after reaching the queue size maximum.
Signed-off-by: Alexandre Bounine <alexandre.boun...@idt.com>
Cc: Chul Kim <chul....@idt.com>
Cc: Matt Porter <mpor...@kernel.crashing.org>
Cc: <stable@vger.kernel.org> [3.2.x+]
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
---
drivers/rapidio/devices/tsi721.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff -puN
drivers/rapidio/devices/tsi721.c~rapidio-tsi721-fix-bug-in-inbound-doorbell-handler
drivers/rapidio/devices/tsi721.c
---
a/drivers/rapidio/devices/tsi721.c~rapidio-tsi721-fix-bug-in-inbound-doorbell-handler
+++ a/drivers/rapidio/devices/tsi721.c
@@ -410,13 +410,14 @@ static void tsi721_db_dpc(struct work_st
*/
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;
_
Patches currently in -mm which might be from alexandre.boun...@idt.com are
origin.patch
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