From: Mark Lord <liml@rtr.ca>
To: Jeff Garzik <jgarzik@pobox.com>,
IDE/ATA development list <linux-ide@vger.kernel.org>
Subject: [PATCH 01/03] sata_mv Fix MSI irq race
Date: Tue, 10 Mar 2009 18:49:57 -0400 [thread overview]
Message-ID: <49B6EE95.1010808@rtr.ca> (raw)
Fix a (rare) race condition in mv_interrupt() when using MSI.
The value of hpriv->main_irq_mask_addr can change on on the fly,
and without this patch we could end up writing back a stale copy
to the hardware.
Signed-off-by: Mark Lord <mlord@pobox.com>
---
Duplicate of earlier patch submitted for #upstream-fixes (2.6.29).
This one is for libata-dev #upstream
--- old/drivers/ata/sata_mv.c 2009-03-10 14:04:49.000000000 -0400
+++ new/drivers/ata/sata_mv.c 2009-03-10 17:49:50.000000000 -0400
@@ -2631,12 +2631,13 @@
else
handled = mv_host_intr(host, pending_irqs);
}
- spin_unlock(&host->lock);
/* for MSI: unmask; interrupt cause bits will retrigger now */
if (using_msi)
writel(hpriv->main_irq_mask, hpriv->main_irq_mask_addr);
+ spin_unlock(&host->lock);
+
return IRQ_RETVAL(handled);
}
next reply other threads:[~2009-03-10 22:50 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-10 22:49 Mark Lord [this message]
2009-03-10 22:51 ` [PATCH 02/03] sata_mv cosmetic preparations for IRQ coalescing Mark Lord
2009-03-10 22:52 ` [PATCH 03/03] sata_mv implement " Mark Lord
2009-03-10 23:06 ` Grant Grundler
2009-03-10 23:21 ` Mark Lord
2009-03-11 2:01 ` [PATCH 03/03] sata_mv implement IRQ coalescing (v2) Mark Lord
2009-03-11 4:56 ` [PATCH 04/03] sata_mv optimize IRQ coalescing for 8-port chips Mark Lord
2009-03-15 15:33 ` [PATCH 05/03] sata_mv fix LED blinking for SoC+NCQ Mark Lord
2009-03-25 2:34 ` [PATCH 02/03] sata_mv cosmetic preparations for IRQ coalescing Jeff Garzik
2009-03-25 13:45 ` Mark Lord
2009-03-25 2:36 ` Jeff Garzik
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