From f9ce889b8f8384ee29e1be4b34091a932e6e40f3 Mon Sep 17 00:00:00 2001
From: Harry Zhang <harry.zhang@amd.com>
Date: Thu, 24 Jun 2010 11:34:23 +0800
Subject: [PATCH] libahci: Fix bug in storing EM messages
In function ahci_store_em_buffer(), if the input (signed char*) buffer
contains negative data, the constructed 32-bit long message data may
be wrong.
Signed-off-by: Harry Zhang <harry.zhang@amd.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---
drivers/ata/libahci.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 261f86d102e8..81e772a94d59 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -324,6 +324,7 @@ static ssize_t ahci_store_em_buffer(struct device *dev,
struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *mmio = hpriv->mmio;
void __iomem *em_mmio = mmio + hpriv->em_loc;
+ const unsigned char *msg_buf = buf;
u32 em_ctl, msg;
unsigned long flags;
int i;
@@ -343,8 +344,8 @@ static ssize_t ahci_store_em_buffer(struct device *dev,
}
for (i = 0; i < size; i += 4) {
- msg = buf[i] | buf[i + 1] << 8 |
- buf[i + 2] << 16 | buf[i + 3] << 24;
+ msg = msg_buf[i] | msg_buf[i + 1] << 8 |
+ msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
writel(msg, em_mmio + i);
}
--
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