From 012dc19a45b2b9cc2ebd14aaa401cf782c2abba4 Mon Sep 17 00:00:00 2001 From: John Fastabend Date: Wed, 19 Sep 2012 21:35:57 +0000 Subject: [PATCH] ixgbevf: scheduling while atomic in reset hw path In ixgbevf_reset_hw_vf() msleep is called while holding mbx_lock resulting in a schedule while atomic bug with trace below. This patch uses mdelay instead. BUG: scheduling while atomic: ip/6539/0x00000002 2 locks held by ip/6539: #0: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x19 #1: (&(&adapter->mbx_lock)->rlock){+.+...}, at: [] ixgbevf_reset+0x30/0xc1 [ixgbevf] Modules linked in: ixgbevf ixgbe mdio libfc scsi_transport_fc 8021q scsi_tgt garp stp llc cpufreq_ondemand acpi_cpufreq freq_table mperf ipv6 uinput igb coretemp hwmon crc32c_intel ioatdma i2c_i801 shpchp microcode lpc_ich mfd_core i2c_core joydev dca pcspkr serio_raw pata_acpi ata_generic usb_storage pata_jmicron Pid: 6539, comm: ip Not tainted 3.6.0-rc3jk-net-next+ #104 Call Trace: [] __schedule_bug+0x6a/0x79 [] __schedule+0xa2/0x684 [] ? trace_hardirqs_off+0xd/0xf [] schedule+0x64/0x66 [] schedule_timeout+0xa6/0xca [] ? lock_timer_base+0x52/0x52 [] ? __udelay+0x15/0x17 [] schedule_timeout_uninterruptible+0x1e/0x20 [] msleep+0x1b/0x22 [] ixgbevf_reset_hw_vf+0x90/0xe5 [ixgbevf] [] ixgbevf_reset+0x3b/0xc1 [ixgbevf] [] ixgbevf_open+0x43/0x43e [ixgbevf] [] ? dev_set_rx_mode+0x2e/0x33 [] __dev_open+0xa0/0xe5 [] __dev_change_flags+0xbe/0x142 [] dev_change_flags+0x21/0x56 [] do_setlink+0x2e2/0x7f4 [] ? native_sched_clock+0x37/0x39 [] rtnl_newlink+0x277/0x4bb [] ? rtnl_newlink+0xb4/0x4bb [] ? selinux_capable+0x32/0x3a [] ? ns_capable+0x4f/0x67 [] ? rtnl_lock+0x17/0x19 [] rtnetlink_rcv_msg+0x236/0x253 [] ? rtnetlink_rcv+0x2d/0x2d [] netlink_rcv_skb+0x43/0x94 [] rtnetlink_rcv+0x26/0x2d [] netlink_unicast+0xee/0x174 [] netlink_sendmsg+0x26a/0x288 [] ? rcu_read_unlock+0x56/0x67 [] __sock_sendmsg_nosec+0x58/0x61 [] __sock_sendmsg+0x3d/0x48 [] sock_sendmsg+0x6e/0x87 [] ? might_fault+0xa5/0xac [] ? copy_from_user+0x2a/0x2c [] ? verify_iovec+0x54/0xaa [] __sys_sendmsg+0x206/0x288 [] ? up_read+0x23/0x3d [] ? fcheck_files+0xac/0xea [] ? fget_light+0x3a/0xb9 [] sys_sendmsg+0x42/0x60 [] system_call_fastpath+0x16/0x1b CC: Eric Dumazet Signed-off-by: John Fastabend Tested-By: Robert Garrett Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/ixgbevf/vf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/ixgbevf/vf.c b/drivers/net/ethernet/intel/ixgbevf/vf.c index 690801b..87b3f3b 100644 --- a/drivers/net/ethernet/intel/ixgbevf/vf.c +++ b/drivers/net/ethernet/intel/ixgbevf/vf.c @@ -100,7 +100,7 @@ static s32 ixgbevf_reset_hw_vf(struct ixgbe_hw *hw) msgbuf[0] = IXGBE_VF_RESET; mbx->ops.write_posted(hw, msgbuf, 1); - msleep(10); + mdelay(10); /* set our "perm_addr" based on info provided by PF */ /* also set up the mc_filter_type which is piggy backed -- 2.7.4