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>
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 261f86d..81e772a 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -324,6 +324,7 @@
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 @@
}
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);
}