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authorDavid S. Miller <davem@davemloft.net>2010-03-26 10:23:30 -0700
committerDavid S. Miller <davem@davemloft.net>2010-03-26 10:23:30 -0700
commit4300e8c7f64d95a80ffa7d98d98738f41546bc30 (patch)
treec147d782512379a4357d4717bf146a9ebbdeaaaf /drivers
parent3da0ae6298fa10d4f5e2855ae400b2470bc6693d (diff)
downloadlinux-2.6.34-ux500-4300e8c7f64d95a80ffa7d98d98738f41546bc30.tar.gz
Revert "r8169: enable 64-bit DMA by default for PCI Express devices (v2)"
This reverts commit 353176888386d9025062a12dcec08d49af10cf2c. People are reporting problems due to this change and there is no anticipation that the cause will be tracked down any time soon. We can try next time to selectively re-enable this based upon chip type, or have a black list of some sort. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/r8169.c21
1 files changed, 7 insertions, 14 deletions
diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 9d3ebf3e975..b93fd23b9f0 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -187,7 +187,7 @@ static DEFINE_PCI_DEVICE_TABLE(rtl8169_pci_tbl) = {
MODULE_DEVICE_TABLE(pci, rtl8169_pci_tbl);
static int rx_copybreak = 200;
-static int use_dac = -1;
+static int use_dac;
static struct {
u32 msg_enable;
} debug = { -1 };
@@ -511,8 +511,7 @@ MODULE_DESCRIPTION("RealTek RTL-8169 Gigabit Ethernet driver");
module_param(rx_copybreak, int, 0);
MODULE_PARM_DESC(rx_copybreak, "Copy breakpoint for copy-only-tiny-frames");
module_param(use_dac, int, 0);
-MODULE_PARM_DESC(use_dac, "Enable PCI DAC. -1 defaults on for PCI Express only."
-" Unsafe on 32 bit PCI slot.");
+MODULE_PARM_DESC(use_dac, "Enable PCI DAC. Unsafe on 32 bit PCI slot.");
module_param_named(debug, debug.msg_enable, int, 0);
MODULE_PARM_DESC(debug, "Debug verbosity level (0=none, ..., 16=all)");
MODULE_LICENSE("GPL");
@@ -2974,7 +2973,6 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
void __iomem *ioaddr;
unsigned int i;
int rc;
- int this_use_dac = use_dac;
if (netif_msg_drv(&debug)) {
printk(KERN_INFO "%s Gigabit Ethernet driver %s loaded\n",
@@ -3040,17 +3038,8 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
tp->cp_cmd = PCIMulRW | RxChkSum;
- tp->pcie_cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
- if (!tp->pcie_cap)
- netif_info(tp, probe, dev, "no PCI Express capability\n");
-
- if (this_use_dac < 0)
- this_use_dac = tp->pcie_cap != 0;
-
if ((sizeof(dma_addr_t) > 4) &&
- this_use_dac &&
- !pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
- netif_info(tp, probe, dev, "using 64-bit DMA\n");
+ !pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) && use_dac) {
tp->cp_cmd |= PCIDAC;
dev->features |= NETIF_F_HIGHDMA;
} else {
@@ -3069,6 +3058,10 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
goto err_out_free_res_4;
}
+ tp->pcie_cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
+ if (!tp->pcie_cap)
+ netif_info(tp, probe, dev, "no PCI Express capability\n");
+
RTL_W16(IntrMask, 0x0000);
/* Soft reset the chip. */