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Message-ID: <20140125170120.2e78cdb4@nehalam.linuxnetplumber.net> Date: Sat, 25 Jan 2014 17:01:20 -0800 From: Stephen Hemminger <stephen@...workplumber.org> To: Stanislaw Gruszka <stf_xl@...pl> Cc: netdev@...r.kernel.org, Mirko Lindner <mlindner@...vell.com> Subject: Re: [PATCH] sky2: initialize napi before registering device On Sat, 25 Jan 2014 11:34:54 +0100 Stanislaw Gruszka <stf_xl@...pl> wrote: > There is race condition when call netif_napi_add() after > register_netdevice(), as ->open() can be called without napi initialized > and trigger BUG_ON() on napi_enable(), like on below messages: > > [ 9.699863] sky2: driver version 1.30 > [ 9.699960] sky2 0000:02:00.0: Yukon-2 EC Ultra chip revision 2 > [ 9.700020] sky2 0000:02:00.0: irq 45 for MSI/MSI-X > [ 9.700498] ------------[ cut here ]------------ > [ 9.703391] kernel BUG at include/linux/netdevice.h:501! > [ 9.703391] invalid opcode: 0000 [#1] PREEMPT SMP > <snip> > [ 9.830018] Call Trace: > [ 9.830018] [<fa996169>] sky2_open+0x309/0x360 [sky2] > [ 9.830018] [<c1007210>] ? via_no_dac+0x40/0x40 > [ 9.830018] [<c1007210>] ? via_no_dac+0x40/0x40 > [ 9.830018] [<c135ed4b>] __dev_open+0x9b/0x120 > [ 9.830018] [<c1431cbe>] ? _raw_spin_unlock_bh+0x1e/0x20 > [ 9.830018] [<c135efd9>] __dev_change_flags+0x89/0x150 > [ 9.830018] [<c135f148>] dev_change_flags+0x18/0x50 > [ 9.830018] [<c13bb8e0>] devinet_ioctl+0x5d0/0x6e0 > [ 9.830018] [<c13bcced>] inet_ioctl+0x6d/0xa0 > > To fix the problem patch changes the order of initialization. > > Bug report: > https://bugzilla.kernel.org/show_bug.cgi?id=67151 > > Reported-and-tested-by: ebrahim.azarisooreh@...il.com > Signed-off-by: Stanislaw Gruszka <stf_xl@...pl> That looks good, problem was introduced years ago. I wonder if netif_napi_del() should be in unwind if registration of either devices fails? -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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