From cc2f41f84fdc68074e228397247acd32ad06440a Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 9 Sep 2016 09:34:46 +0200 Subject: [PATCH] iwlwifi: pcie: avoid variable shadowing in TFD helpers The various TFD/TB helpers have two code paths depending on the type of TFD supported, with variable shadowing due to the new if branches. Move the fall-through code into else branches to avoid variable shadowing. While doing so, rename some of the variables and do some other cleanups (like removing void * casts of void * pointers.) Signed-off-by: Johannes Berg Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/pcie/internal.h | 19 ++++----- drivers/net/wireless/intel/iwlwifi/pcie/tx.c | 47 ++++++++++++---------- 2 files changed, 33 insertions(+), 33 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h index 2d81630..cac6d99 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h +++ b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h @@ -497,23 +497,20 @@ void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn, struct sk_buff_head *skbs); void iwl_trans_pcie_tx_reset(struct iwl_trans *trans); -static inline u16 iwl_pcie_tfd_tb_get_len(struct iwl_trans *trans, void *tfd, +static inline u16 iwl_pcie_tfd_tb_get_len(struct iwl_trans *trans, void *_tfd, u8 idx) { - struct iwl_tfd *tfd_fh; - struct iwl_tfd_tb *tb; - if (trans->cfg->use_tfh) { - struct iwl_tfh_tfd *tfd_fh = (void *)tfd; - struct iwl_tfh_tb *tb = &tfd_fh->tbs[idx]; + struct iwl_tfh_tfd *tfd = _tfd; + struct iwl_tfh_tb *tb = &tfd->tbs[idx]; return le16_to_cpu(tb->tb_len); - } - - tfd_fh = (void *)tfd; - tb = &tfd_fh->tbs[idx]; + } else { + struct iwl_tfd *tfd = _tfd; + struct iwl_tfd_tb *tb = &tfd->tbs[idx]; - return le16_to_cpu(tb->hi_n_len) >> 4; + return le16_to_cpu(tb->hi_n_len) >> 4; + } } /***************************************************** diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/tx.c b/drivers/net/wireless/intel/iwlwifi/pcie/tx.c index e00e7d8..e9a278b 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/tx.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/tx.c @@ -337,28 +337,32 @@ static inline void *iwl_pcie_get_tfd(struct iwl_trans_pcie *trans_pcie, } static inline dma_addr_t iwl_pcie_tfd_tb_get_addr(struct iwl_trans *trans, - void *tfd, u8 idx) + void *_tfd, u8 idx) { - struct iwl_tfd *tfd_fh; - struct iwl_tfd_tb *tb; - dma_addr_t addr; if (trans->cfg->use_tfh) { - struct iwl_tfh_tfd *tfd_fh = (void *)tfd; - struct iwl_tfh_tb *tb = &tfd_fh->tbs[idx]; + struct iwl_tfh_tfd *tfd = _tfd; + struct iwl_tfh_tb *tb = &tfd->tbs[idx]; return (dma_addr_t)(le64_to_cpu(tb->addr)); - } + } else { + struct iwl_tfd *tfd = _tfd; + struct iwl_tfd_tb *tb = &tfd->tbs[idx]; + dma_addr_t addr = get_unaligned_le32(&tb->lo); + dma_addr_t hi_len; - tfd_fh = (void *)tfd; - tb = &tfd_fh->tbs[idx]; - addr = get_unaligned_le32(&tb->lo); + if (sizeof(dma_addr_t) <= sizeof(u32)) + return addr; - if (sizeof(dma_addr_t) > sizeof(u32)) - addr |= - ((dma_addr_t)(le16_to_cpu(tb->hi_n_len) & 0xF) << 16) << 16; + hi_len = le16_to_cpu(tb->hi_n_len) & 0xF; - return addr; + /* + * shift by 16 twice to avoid warnings on 32-bit + * (where this code never runs anyway due to the + * if statement above) + */ + return addr | ((hi_len << 16) << 16); + } } static inline void iwl_pcie_tfd_set_tb(struct iwl_trans *trans, void *tfd, @@ -388,18 +392,17 @@ static inline void iwl_pcie_tfd_set_tb(struct iwl_trans *trans, void *tfd, } } -static inline u8 iwl_pcie_tfd_get_num_tbs(struct iwl_trans *trans, void *tfd) +static inline u8 iwl_pcie_tfd_get_num_tbs(struct iwl_trans *trans, void *_tfd) { - struct iwl_tfd *tfd_fh; - if (trans->cfg->use_tfh) { - struct iwl_tfh_tfd *tfd_fh = (void *)tfd; + struct iwl_tfh_tfd *tfd = _tfd; - return le16_to_cpu(tfd_fh->num_tbs) & 0x1f; - } + return le16_to_cpu(tfd->num_tbs) & 0x1f; + } else { + struct iwl_tfd *tfd = _tfd; - tfd_fh = (void *)tfd; - return tfd_fh->num_tbs & 0x1f; + return tfd->num_tbs & 0x1f; + } } static void iwl_pcie_tfd_unmap(struct iwl_trans *trans, -- 2.7.4