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Date: Tue, 21 Mar 2017 17:59:12 -0700 From: Jakub Kicinski <jakub.kicinski@...ronome.com> To: netdev@...r.kernel.org Cc: oss-drivers@...ronome.com, kubakici@...pl, Jakub Kicinski <jakub.kicinski@...ronome.com> Subject: [PATCH net-next 06/15] nfp: lock area cache earlier We shouldn't access area_cache_list without its lock even to check if it's empty. Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com> --- drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c index 4e08362d8c97..5189fedb0f4f 100644 --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c @@ -821,10 +821,7 @@ area_cache_get(struct nfp_cpp *cpp, u32 id, * the need for special case code below when * checking against available cache size. */ - if (length == 0) - return NULL; - - if (list_empty(&cpp->area_cache_list) || id == 0) + if (length == 0 || id == 0) return NULL; /* Remap from cpp_island to cpp_target */ @@ -832,10 +829,15 @@ area_cache_get(struct nfp_cpp *cpp, u32 id, if (err < 0) return NULL; - addr += *offset; - mutex_lock(&cpp->area_cache_mutex); + if (list_empty(&cpp->area_cache_list)) { + mutex_unlock(&cpp->area_cache_mutex); + return NULL; + } + + addr += *offset; + /* See if we have a match */ list_for_each_entry(cache, &cpp->area_cache_list, entry) { if (id == cache->id && -- 2.11.0
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