Messages in this thread Patch in this message | | | Subject | [patch] synclink.c compiler optimiation fix | From | Paul Fulghum <> | Date | Wed, 07 Sep 2005 12:02:23 -0500 |
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[patch] synclink.c compiler optimization fix
From: Paul Fulghum <paulkf@microgate.com>
Make some fields of DMA descriptor volatile to prevent compiler optimizations.
Signed-off-by: Paul Fulghum <paulkf@microgate.com>
--- 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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