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authorMichael Chan <mchan@broadcom.com>2009-05-06 16:46:47 -0700
committerDavid S. Miller <davem@davemloft.net>2009-05-06 16:46:47 -0700
commit581daf7e00c5e766f26aff80a61a860a17b0d75a (patch)
treed2b548325aa7acc4cea2a779d4e72a21c3a1a94f /net/core
parent6473990c7f0565fca2007f8662395d122e30f0d8 (diff)
bnx2: Fix panic in bnx2_poll_work().
Add barrier() to bnx2_get_hw_{tx|rx}_cons() to fix this issue: http://bugzilla.kernel.org/show_bug.cgi?id=12698 This issue was reported by multiple i386 users. Without barrier(), the compiled code looks like the following where %eax contains the address of the tx_cons or rx_cons in the DMA status block. The status block contents can change between the cmpb and the movzwl instruction. The driver would crash if the value was not 0xff during the cmpb instruction, but changed to 0xff during the movzwl instruction. 6828: 80 38 ff cmpb $0xff,(%eax) 682b: 0f b7 10 movzwl (%eax),%edx With the added barrier(), the compiled code now looks correct: 683d: 0f b7 10 movzwl (%eax),%edx 6840: 0f b6 c2 movzbl %dl,%eax 6843: 3d ff 00 00 00 cmp $0xff,%eax Thanks to Pascal de Bruijn <pmjdebruijn@pcode.nl> for reporting the problem and Holger Noefer <hnoefer@pironet-ndh.com> for patiently testing test patches for us. Also updated version to 2.0.1. Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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