releases/4.0.8/sparc-Use-GFP_ATOMIC-in-ldc_alloc_exp_dring-as-it-can-be-called-in-softirq-context.patch

   1 From patchwork Tue Apr 21 14:30:41 2015
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   5 Subject: sparc: Use GFP_ATOMIC in ldc_alloc_exp_dring() as it can be called in
   6  softirq context
   7 From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
   8 X-Patchwork-Id: 463148
   9 Message-Id: <1429626641-199974-1-git-send-email-sowmini.varadhan@oracle.com>
  10 To: sowmini.varadhan@oracle.com, sparclinux@vger.kernel.org
  11 Cc: david.stevens@oracle.com, davem@davemloft.net
  12 Date: Tue, 21 Apr 2015 10:30:41 -0400
  13
  14 From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
  15
  16 Upstream commit 671d773297969bebb1732e1cdc1ec03aa53c6be2
  17
  18 Since it is possible for vnet_event_napi to end up doing
  19 vnet_control_pkt_engine -> ... -> vnet_send_attr ->
  20 vnet_port_alloc_tx_ring -> ldc_alloc_exp_dring -> kzalloc()
  21 (i.e., in softirq context), kzalloc() should be called with
  22 GFP_ATOMIC from ldc_alloc_exp_dring.
  23
  24 Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
  25 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  26 ---
  27  arch/sparc/kernel/ldc.c |    2 +-
  28  1 file changed, 1 insertion(+), 1 deletion(-)
  29
  30 --- a/arch/sparc/kernel/ldc.c
  31 +++ b/arch/sparc/kernel/ldc.c
  32 @@ -2313,7 +2313,7 @@ void *ldc_alloc_exp_dring(struct ldc_cha
  33         if (len & (8UL - 1))
  34                 return ERR_PTR(-EINVAL);
  35
  36 -       buf = kzalloc(len, GFP_KERNEL);
  37 +       buf = kzalloc(len, GFP_ATOMIC);
  38         if (!buf)
  39                 return ERR_PTR(-ENOMEM);
  40