netdev - [PATCH net 2/2] enic: Do not call napi_disable when preemption is disabled.

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Date:	Sun, 19 Oct 2014 14:20:28 +0530
From:	Govindarajulu Varadarajan <_govind@....com>
To:	davem@...emloft.net, netdev@...r.kernel.org
Cc:	ssujith@...co.com, benve@...co.com,
	Govindarajulu Varadarajan <_govind@....com>
Subject: [PATCH net 2/2] enic: Do not call napi_disable when preemption is disabled.

In enic_stop, we disable preemption using local_bh_disable(). We disable
preemption to wait for busy_poll to finish.

napi_disable should not be called here as it might sleep.

Moving napi_disable() call out side of local_bh_disable.

BUG: sleeping function called from invalid context at include/linux/netdevice.h:477
in_atomic(): 1, irqs_disabled(): 0, pid: 443, name: ifconfig
INFO: lockdep is turned off.
Preemption disabled at:[<ffffffffa029c5c4>] enic_rfs_flw_tbl_free+0x34/0xd0 [enic]

CPU: 31 PID: 443 Comm: ifconfig Not tainted 3.17.0-netnext-05504-g59f35b8 #268
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
 ffff8800dac10000 ffff88020b8dfcb8 ffffffff8148a57c 0000000000000000
 ffff88020b8dfcd0 ffffffff8107e253 ffff8800dac12a40 ffff88020b8dfd10
 ffffffffa029305b ffff88020b8dfd48 ffff8800dac10000 ffff88020b8dfd48
Call Trace:
 [<ffffffff8148a57c>] dump_stack+0x4e/0x7a
 [<ffffffff8107e253>] __might_sleep+0x123/0x1a0
 [<ffffffffa029305b>] enic_stop+0xdb/0x4d0 [enic]
 [<ffffffff8138ed7d>] __dev_close_many+0x9d/0xf0
 [<ffffffff8138ef81>] __dev_close+0x31/0x50
 [<ffffffff813974a8>] __dev_change_flags+0x98/0x160
 [<ffffffff81397594>] dev_change_flags+0x24/0x60
 [<ffffffff814085fd>] devinet_ioctl+0x63d/0x710
 [<ffffffff81139c16>] ? might_fault+0x56/0xc0
 [<ffffffff81409ef5>] inet_ioctl+0x65/0x90
 [<ffffffff813768e0>] sock_do_ioctl+0x20/0x50
 [<ffffffff81376ebb>] sock_ioctl+0x20b/0x2e0
 [<ffffffff81197250>] do_vfs_ioctl+0x2e0/0x500
 [<ffffffff81492619>] ? sysret_check+0x22/0x5d
 [<ffffffff81285f23>] ? __this_cpu_preempt_check+0x13/0x20
 [<ffffffff8109fe19>] ? trace_hardirqs_on_caller+0x119/0x270
 [<ffffffff811974ac>] SyS_ioctl+0x3c/0x80
 [<ffffffff814925ed>] system_call_fastpath+0x1a/0x1f

Signed-off-by: Govindarajulu Varadarajan <_govind@....com>
---
 drivers/net/ethernet/cisco/enic/enic_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c
index 929bfe7..180e53f 100644
--- a/drivers/net/ethernet/cisco/enic/enic_main.c
+++ b/drivers/net/ethernet/cisco/enic/enic_main.c
@@ -1674,13 +1674,13 @@ static int enic_stop(struct net_device *netdev)
 
 	enic_dev_disable(enic);
 
-	local_bh_disable();
 	for (i = 0; i < enic->rq_count; i++) {
 		napi_disable(&enic->napi[i]);
+		local_bh_disable();
 		while (!enic_poll_lock_napi(&enic->rq[i]))
 			mdelay(1);
+		local_bh_enable();
 	}
-	local_bh_enable();
 
 	netif_carrier_off(netdev);
 	netif_tx_disable(netdev);
-- 
2.1.0

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