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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.bounine@idt.com>
Cc: Chul Kim <chul.kim@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: <stable@vger.kernel.org>		[3.2.x+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexandre Bounine 2012-03-05 14:59:21 -08:00 committed by Linus Torvalds
parent e6ca7b89dc
commit b24823e61b
1 changed files with 3 additions and 2 deletions
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5
drivers/rapidio/devices/tsi721.c
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@ -410,13 +410,14 @@ 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;