[patch] synclink.c compiler optimization fix
From: Paul Fulghum <[email protected]>
Make some fields of DMA descriptor volatile to
prevent compiler optimizations.
Signed-off-by: Paul Fulghum <[email protected]>
--- linux-2.6.13/drivers/char/synclink.c 2005-09-07 11:43:56.000000000 -0500
+++ linux-2.6.13-mg/drivers/char/synclink.c 2005-09-07 11:52:08.000000000 -0500
@@ -1,7 +1,7 @@
/*
* linux/drivers/char/synclink.c
*
- * $Id: synclink.c,v 4.28 2004/08/11 19:30:01 paulkf Exp $
+ * $Id: synclink.c,v 4.37 2005/09/07 13:13:19 paulkf Exp $
*
* Device driver for Microgate SyncLink ISA and PCI
* high speed multiprotocol serial adapters.
@@ -141,9 +141,9 @@ static MGSL_PARAMS default_params = {
typedef struct _DMABUFFERENTRY
{
u32 phys_addr; /* 32-bit flat physical address of data buffer */
- u16 count; /* buffer size/data count */
- u16 status; /* Control/status field */
- u16 rcc; /* character count field */
+ volatile u16 count; /* buffer size/data count */
+ volatile u16 status; /* Control/status field */
+ volatile u16 rcc; /* character count field */
u16 reserved; /* padding required by 16C32 */
u32 link; /* 32-bit flat link to next buffer entry */
char *virt_addr; /* virtual address of data buffer */
@@ -896,7 +896,7 @@ module_param_array(txdmabufs, int, NULL,
module_param_array(txholdbufs, int, NULL, 0);
static char *driver_name = "SyncLink serial driver";
-static char *driver_version = "$Revision: 4.28 $";
+static char *driver_version = "$Revision: 4.37 $";
static int synclink_init_one (struct pci_dev *dev,
const struct pci_device_id *ent);
-
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