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bnx2: Wait for in-flight DMA to complete at probe stage

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In-flight DMA from 1st kernel could continue going in kdump kernel.
New io-page table has been created before bnx2 does reset at open stage.
We have to wait for the in-flight DMA to complete to avoid it look up
into the newly created io-page table at probe stage.

Suggested-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Baoquan He 2016-11-13 13:01:33 +08:00 committed by David S. Miller
parent 5d0d4b91bf
commit 6df77862f6
1 changed files with 32 additions and 6 deletions
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38
drivers/net/ethernet/broadcom/bnx2.c
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@ -49,6 +49,7 @@
#include <linux/firmware.h>
#include <linux/log2.h>
#include <linux/aer.h>
#include <linux/crash_dump.h>
#if IS_ENABLED(CONFIG_CNIC)
#define BCM_CNIC 1
@ -4764,15 +4765,16 @@ bnx2_setup_msix_tbl(struct bnx2 *bp)
BNX2_WR(bp, BNX2_PCI_GRC_WINDOW3_ADDR, BNX2_MSIX_PBA_ADDR);
}
static int
bnx2_reset_chip(struct bnx2 *bp, u32 reset_code)
static void
bnx2_wait_dma_complete(struct bnx2 *bp)
{
u32 val;
int i, rc = 0;
u8 old_port;
int i;
/* Wait for the current PCI transaction to complete before
* issuing a reset. */
/*
* Wait for the current PCI transaction to complete before
* issuing a reset.
*/
if ((BNX2_CHIP(bp) == BNX2_CHIP_5706) ||
(BNX2_CHIP(bp) == BNX2_CHIP_5708)) {
BNX2_WR(bp, BNX2_MISC_ENABLE_CLR_BITS,
@ -4796,6 +4798,21 @@ bnx2_reset_chip(struct bnx2 *bp, u32 reset_code)
}
}
return;
}
static int
bnx2_reset_chip(struct bnx2 *bp, u32 reset_code)
{
u32 val;
int i, rc = 0;
u8 old_port;
/* Wait for the current PCI transaction to complete before
* issuing a reset. */
bnx2_wait_dma_complete(bp);
/* Wait for the firmware to tell us it is ok to issue a reset. */
bnx2_fw_sync(bp, BNX2_DRV_MSG_DATA_WAIT0 | reset_code, 1, 1);
@ -8580,6 +8597,15 @@ bnx2_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
pci_set_drvdata(pdev, dev);
/*
* In-flight DMA from 1st kernel could continue going in kdump kernel.
* New io-page table has been created before bnx2 does reset at open stage.
* We have to wait for the in-flight DMA to complete to avoid it look up
* into the newly created io-page table.
*/
if (is_kdump_kernel())
bnx2_wait_dma_complete(bp);
memcpy(dev->dev_addr, bp->mac_addr, ETH_ALEN);
dev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG |