The patch titled
Subject: rapidio/tsi721: fix inbound doorbell interrupt handling
has been added to the -mm tree. Its filename is
rapidio-tsi721-fix-inbound-doorbell-interrupt-handling.patch
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------------------------------------------------------
From: Alexandre Bounine <alexandre.bounine@xxxxxxx>
Subject: rapidio/tsi721: fix inbound doorbell interrupt handling
Make sure that there is no doorbell messages left behind due to disabled
interrupts during inbound doorbell processing.
The most common case for this bug is loss of rionet JOIN messages in
systems with three or more rionet participants and MSI or MSI-X enabled.
As result, requests for packet transfers may finish with "destination
unreachable" error message.
This patch is applicable to kernel versions starting from v3.2.
Signed-off-by: Alexandre Bounine <alexandre.bounine@xxxxxxx>
Cc: Matt Porter <mporter@xxxxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/rapidio/devices/tsi721.c | 7 +++++++
1 file changed, 7 insertions(+)
diff -puN drivers/rapidio/devices/tsi721.c~rapidio-tsi721-fix-inbound-doorbell-interrupt-handling drivers/rapidio/devices/tsi721.c
--- a/drivers/rapidio/devices/tsi721.c~rapidio-tsi721-fix-inbound-doorbell-interrupt-handling
+++ a/drivers/rapidio/devices/tsi721.c
@@ -435,6 +435,9 @@ static void tsi721_db_dpc(struct work_st
" info %4.4x\n", DBELL_SID(idb.bytes),
DBELL_TID(idb.bytes), DBELL_INF(idb.bytes));
}
+
+ wr_ptr = ioread32(priv->regs +
+ TSI721_IDQ_WP(IDB_QUEUE)) % IDB_QSIZE;
}
iowrite32(rd_ptr & (IDB_QSIZE - 1),
@@ -445,6 +448,10 @@ static void tsi721_db_dpc(struct work_st
regval |= TSI721_SR_CHINT_IDBQRCV;
iowrite32(regval,
priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
+
+ wr_ptr = ioread32(priv->regs + TSI721_IDQ_WP(IDB_QUEUE)) % IDB_QSIZE;
+ if (wr_ptr != rd_ptr)
+ schedule_work(&priv->idb_work);
}
/**
_
Patches currently in -mm which might be from alexandre.bounine@xxxxxxx are
rapidio-tsi721-fix-inbound-doorbell-interrupt-handling.patch
rapidio-tsi721-fix-unused-variable-compiler-warning.patch
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