From a8ec42c1431e8a43f910fb27af4882416cf5d6b1 Mon Sep 17 00:00:00 2001 From: "Zhu, Yi" Date: Fri, 5 Dec 2008 07:58:41 -0800 Subject: [PATCH] iwlwifi: use rmb/wmb to protect indirect mmio operation This patch protects iwlwifi indirect mmio operations with rmb() and wmb(). It makes sure CPU reordering won't affect our indirect mmio access. Signed-off-by: Zhu Yi Signed-off-by: Reinette Chatre Signed-off-by: John W. Linville --- drivers/net/wireless/iwlwifi/iwl-3945-io.h | 5 +++++ drivers/net/wireless/iwlwifi/iwl-io.h | 5 +++++ 2 files changed, 10 insertions(+) diff --git a/drivers/net/wireless/iwlwifi/iwl-3945-io.h b/drivers/net/wireless/iwlwifi/iwl-3945-io.h index 994f8bab0dab..d381b82a7598 100644 --- a/drivers/net/wireless/iwlwifi/iwl-3945-io.h +++ b/drivers/net/wireless/iwlwifi/iwl-3945-io.h @@ -298,6 +298,7 @@ static inline int __iwl3945_poll_direct_bit(const char *f, u32 l, static inline u32 _iwl3945_read_prph(struct iwl3945_priv *priv, u32 reg) { _iwl3945_write_direct32(priv, HBUS_TARG_PRPH_RADDR, reg | (3 << 24)); + rmb(); return _iwl3945_read_direct32(priv, HBUS_TARG_PRPH_RDAT); } #ifdef CONFIG_IWL3945_DEBUG @@ -319,6 +320,7 @@ static inline void _iwl3945_write_prph(struct iwl3945_priv *priv, { _iwl3945_write_direct32(priv, HBUS_TARG_PRPH_WADDR, ((addr & 0x0000FFFF) | (3 << 24))); + wmb(); _iwl3945_write_direct32(priv, HBUS_TARG_PRPH_WDAT, val); } #ifdef CONFIG_IWL3945_DEBUG @@ -380,12 +382,14 @@ static inline void iwl3945_clear_bits_prph(struct iwl3945_priv static inline u32 iwl3945_read_targ_mem(struct iwl3945_priv *priv, u32 addr) { iwl3945_write_direct32(priv, HBUS_TARG_MEM_RADDR, addr); + rmb(); return iwl3945_read_direct32(priv, HBUS_TARG_MEM_RDAT); } static inline void iwl3945_write_targ_mem(struct iwl3945_priv *priv, u32 addr, u32 val) { iwl3945_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr); + wmb(); iwl3945_write_direct32(priv, HBUS_TARG_MEM_WDAT, val); } @@ -393,6 +397,7 @@ static inline void iwl3945_write_targ_mem_buf(struct iwl3945_priv *priv, u32 add u32 len, u32 *values) { iwl3945_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr); + wmb(); for (; 0 < len; len -= sizeof(u32), values++) iwl3945_write_direct32(priv, HBUS_TARG_MEM_WDAT, *values); } diff --git a/drivers/net/wireless/iwlwifi/iwl-io.h b/drivers/net/wireless/iwlwifi/iwl-io.h index c56dc215fef7..10ca032f905e 100644 --- a/drivers/net/wireless/iwlwifi/iwl-io.h +++ b/drivers/net/wireless/iwlwifi/iwl-io.h @@ -299,6 +299,7 @@ static inline int __iwl_poll_direct_bit(const char *f, u32 l, static inline u32 _iwl_read_prph(struct iwl_priv *priv, u32 reg) { _iwl_write_direct32(priv, HBUS_TARG_PRPH_RADDR, reg | (3 << 24)); + rmb(); return _iwl_read_direct32(priv, HBUS_TARG_PRPH_RDAT); } #ifdef CONFIG_IWLWIFI_DEBUG @@ -321,6 +322,7 @@ static inline void _iwl_write_prph(struct iwl_priv *priv, { _iwl_write_direct32(priv, HBUS_TARG_PRPH_WADDR, ((addr & 0x0000FFFF) | (3 << 24))); + wmb(); _iwl_write_direct32(priv, HBUS_TARG_PRPH_WDAT, val); } #ifdef CONFIG_IWLWIFI_DEBUG @@ -383,12 +385,14 @@ static inline void iwl_clear_bits_prph(struct iwl_priv static inline u32 iwl_read_targ_mem(struct iwl_priv *priv, u32 addr) { iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR, addr); + rmb(); return iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT); } static inline void iwl_write_targ_mem(struct iwl_priv *priv, u32 addr, u32 val) { iwl_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr); + wmb(); iwl_write_direct32(priv, HBUS_TARG_MEM_WDAT, val); } @@ -396,6 +400,7 @@ static inline void iwl_write_targ_mem_buf(struct iwl_priv *priv, u32 addr, u32 len, u32 *values) { iwl_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr); + wmb(); for (; 0 < len; len -= sizeof(u32), values++) iwl_write_direct32(priv, HBUS_TARG_MEM_WDAT, *values); } -- 2.30.2