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cxgb4 : Disable recursive mailbox commands when enabling vi 

Enabling a Virtual Interface can result in an interrupt during the processing
 of the VI Enable command and, in some paths, result in an attempt to issue
another command in the interrupt context, eventually crashing the system. Thus,
 we disable interrupts during the course of the VI Enable command and ensure
enable doesn't sleep.

Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Anish Bhatt 2014-08-05 16:05:23 -07:00 committed by David S. Miller
parent 1bb5a356c3
commit 30f0084795
2 changed files with 5 additions and 2 deletions
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5
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
View File

@ -673,9 +673,12 @@ static int link_start(struct net_device *dev)
if (ret == 0)
ret = t4_link_start(pi->adapter, mb, pi->tx_chan,
&pi->link_cfg);
if (ret == 0)
if (ret == 0) {
local_bh_disable();
ret = t4_enable_vi_params(pi->adapter, mb, pi->viid, true,
true, CXGB4_DCB_ENABLED);
local_bh_enable();
}
return ret;
}

2
drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
View File

@ -3558,7 +3558,7 @@ int t4_enable_vi_params(struct adapter *adap, unsigned int mbox,
c.ien_to_len16 = htonl(FW_VI_ENABLE_CMD_IEN(rx_en) |
FW_VI_ENABLE_CMD_EEN(tx_en) | FW_LEN16(c) |
FW_VI_ENABLE_CMD_DCB_INFO(dcb_en));
return t4_wr_mbox(adap, mbox, &c, sizeof(c), NULL);
return t4_wr_mbox_ns(adap, mbox, &c, sizeof(c), NULL);
}
/**