[2.6.20.21 review 05/35] DCCP: Fix DCCP GFP_KERNEL allocation in atomic context

Willy Tarreau
2007-10-13T14:59:27Z

[-- Attachment #1: 0029-DCCP-Fix-DCCP-GFP_KERNEL-allocation-in-atomic-conte.patch --]
[-- Type: text/plain, Size: 2039 bytes --]

This fixes the following bug reported in syslog:

[ 4039.051658] BUG: sleeping function called from invalid context at /usr/src/davem-2.6/mm/slab.c:3032
[ 4039.051668] in_atomic():1, irqs_disabled():0
[ 4039.051670] INFO: lockdep is turned off.
[ 4039.051674] [<c0104c0f>] show_trace_log_lvl+0x1a/0x30
[ 4039.051687] [<c0104d4d>] show_trace+0x12/0x14
[ 4039.051691] [<c0104d65>] dump_stack+0x16/0x18
[ 4039.051695] [<c011371e>] __might_sleep+0xaf/0xbe
[ 4039.051700] [<c0157b66>] __kmalloc+0xb1/0xd0
[ 4039.051706] [<f090416f>] ccid2_hc_tx_alloc_seq+0x35/0xc3 [dccp_ccid2]
[ 4039.051717] [<f09048d6>] ccid2_hc_tx_packet_sent+0x27f/0x2d9 [dccp_ccid2]
[ 4039.051723] [<f085486b>] dccp_write_xmit+0x1eb/0x338 [dccp]
[ 4039.051741] [<f085603d>] dccp_sendmsg+0x113/0x18f [dccp]
[ 4039.051750] [<c03907fc>] inet_sendmsg+0x2e/0x4c
[ 4039.051758] [<c033a47d>] sock_aio_write+0xd5/0x107
[ 4039.051766] [<c015abc1>] do_sync_write+0xcd/0x11c
[ 4039.051772] [<c015b296>] vfs_write+0x118/0x11f
[ 4039.051840] [<c015b932>] sys_write+0x3d/0x64
[ 4039.051845] [<c0103e7c>] syscall_call+0x7/0xb
[ 4039.051848] =======================

The problem was that GFP_KERNEL was used; fixed by using gfp_any().

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
net/dccp/ccids/ccid2.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

Index: 2.6/net/dccp/ccids/ccid2.c
===================================================================
--- 2.6.orig/net/dccp/ccids/ccid2.c
+++ 2.6/net/dccp/ccids/ccid2.c
@@ -298,7 +298,7 @@ static void ccid2_hc_tx_packet_sent(stru
int rc;

ccid2_pr_debug("allocating more space in history
");
- rc = ccid2_hc_tx_alloc_seq(hctx, CCID2_SEQBUF_LEN, GFP_KERNEL);
+ rc = ccid2_hc_tx_alloc_seq(hctx, CCID2_SEQBUF_LEN, gfp_any());
BUG_ON(rc); /* XXX what do we do? */

next = hctx->ccid2hctx_seqh->ccid2s_next;

--