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authorDmitry Kravkov <dmitry@broadcom.com>2013-04-17 22:49:05 +0000
committerDavid S. Miller <davem@davemloft.net>2013-04-18 15:03:25 -0400
commitd46f7c4df342c27cea676939d7c005f1e86173e9 (patch)
treef7e98e153715f16080d04ea9402365002481e341 /drivers/net
parentd5f2cffc49ae27aff52eeda6206acb5db54693c9 (diff)
downloadlinux-d46f7c4df342c27cea676939d7c005f1e86173e9.tar.gz
bnx2x: Prevent UNDI FW illegal host access
When loading after UNDI (e.g., Boot from SAN) the UNDI does not gracefully yield its resources; The bnx2x driver handles that release itself. During the manipulation required to release those resources, it's possible for the UNDI to try and write to memory regions which are no longer accessible, causing the PCI bus to prevent further writes from the chip. This would in turn cause DMAE timeouts later on in the driver, as the driver will be unable to use the chip's DMA engines. This patch prevents the chip from actually writing through the PCI bus in said scenario, thus allowing the release without the unfortunate by-product. Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com> Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com> Signed-off-by: Ariel Elior <ariele@broadcom.com> Signed-off-by: Eilon Greenstein <eilong@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index 8e58da909f5..c50696b396f 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -9878,6 +9878,10 @@ static int bnx2x_prev_unload_common(struct bnx2x *bp)
REG_RD(bp, NIG_REG_NIG_INT_STS_CLR_0);
}
}
+ if (!CHIP_IS_E1x(bp))
+ /* block FW from writing to host */
+ REG_WR(bp, PGLUE_B_REG_INTERNAL_PFID_ENABLE_MASTER, 0);
+
/* wait until BRB is empty */
tmp_reg = REG_RD(bp, BRB1_REG_NUM_OF_FULL_BLOCKS);
while (timer_count) {