From bfe4b80e9f7385f34986736cdc094be56782109a Mon Sep 17 00:00:00 2001 From: Stanislaw Gruszka Date: Wed, 7 Mar 2012 09:52:24 -0800 Subject: [PATCH] iwlwifi: always check if got h/w access before write Before we write to the device registers always check if iwl_grap_nic_access() was successful. On the way change return type of grab_nic_access() to bool, and add likely()/unlikely() statement. Signed-off-by: Stanislaw Gruszka Signed-off-by: Johannes Berg Signed-off-by: Wey-Yi Guy Signed-off-by: John W. Linville --- drivers/net/wireless/iwlwifi/iwl-agn-tt.c | 2 +- drivers/net/wireless/iwlwifi/iwl-agn.c | 2 +- drivers/net/wireless/iwlwifi/iwl-io.c | 53 ++++++++++--------- drivers/net/wireless/iwlwifi/iwl-io.h | 2 +- drivers/net/wireless/iwlwifi/iwl-mac80211.c | 2 +- .../net/wireless/iwlwifi/iwl-trans-pcie-rx.c | 4 +- 6 files changed, 35 insertions(+), 30 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-tt.c b/drivers/net/wireless/iwlwifi/iwl-agn-tt.c index 7712c5537370..9a12b70c7d4f 100644 --- a/drivers/net/wireless/iwlwifi/iwl-agn-tt.c +++ b/drivers/net/wireless/iwlwifi/iwl-agn-tt.c @@ -189,7 +189,7 @@ static void iwl_tt_check_exit_ct_kill(unsigned long data) } iwl_read32(trans(priv), CSR_UCODE_DRV_GP1); spin_lock_irqsave(&trans(priv)->reg_lock, flags); - if (!iwl_grab_nic_access(trans(priv))) + if (likely(iwl_grab_nic_access(trans(priv)))) iwl_release_nic_access(trans(priv)); spin_unlock_irqrestore(&trans(priv)->reg_lock, flags); diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c index 5f390f8d3b8b..ce9ebeb89e4c 100644 --- a/drivers/net/wireless/iwlwifi/iwl-agn.c +++ b/drivers/net/wireless/iwlwifi/iwl-agn.c @@ -327,7 +327,7 @@ static void iwl_print_cont_event_trace(struct iwl_priv *priv, u32 base, /* Make sure device is powered up for SRAM reads */ spin_lock_irqsave(&trans(priv)->reg_lock, reg_flags); - if (iwl_grab_nic_access(trans(priv))) { + if (unlikely(!iwl_grab_nic_access(trans(priv)))) { spin_unlock_irqrestore(&trans(priv)->reg_lock, reg_flags); return; } diff --git a/drivers/net/wireless/iwlwifi/iwl-io.c b/drivers/net/wireless/iwlwifi/iwl-io.c index fc365350a3e7..fa69845954cf 100644 --- a/drivers/net/wireless/iwlwifi/iwl-io.c +++ b/drivers/net/wireless/iwlwifi/iwl-io.c @@ -118,16 +118,17 @@ int iwl_grab_nic_access_silent(struct iwl_trans *trans) return 0; } -int iwl_grab_nic_access(struct iwl_trans *trans) +bool iwl_grab_nic_access(struct iwl_trans *trans) { int ret = iwl_grab_nic_access_silent(trans); if (unlikely(ret)) { u32 val = iwl_read32(trans, CSR_GP_CNTRL); WARN_ONCE(1, "Timeout waiting for hardware access " "(CSR_GP_CNTRL 0x%08x)\n", val); + return false; } - return ret; + return true; } void iwl_release_nic_access(struct iwl_trans *trans) @@ -156,7 +157,7 @@ void iwl_write_direct32(struct iwl_trans *trans, u32 reg, u32 value) unsigned long flags; spin_lock_irqsave(&trans->reg_lock, flags); - if (!iwl_grab_nic_access(trans)) { + if (likely(iwl_grab_nic_access(trans))) { iwl_write32(trans, reg, value); iwl_release_nic_access(trans); } @@ -211,7 +212,7 @@ void iwl_write_prph(struct iwl_trans *trans, u32 addr, u32 val) unsigned long flags; spin_lock_irqsave(&trans->reg_lock, flags); - if (!iwl_grab_nic_access(trans)) { + if (likely(iwl_grab_nic_access(trans))) { __iwl_write_prph(trans, addr, val); iwl_release_nic_access(trans); } @@ -223,9 +224,11 @@ void iwl_set_bits_prph(struct iwl_trans *trans, u32 reg, u32 mask) unsigned long flags; spin_lock_irqsave(&trans->reg_lock, flags); - iwl_grab_nic_access(trans); - __iwl_write_prph(trans, reg, __iwl_read_prph(trans, reg) | mask); - iwl_release_nic_access(trans); + if (likely(iwl_grab_nic_access(trans))) { + __iwl_write_prph(trans, reg, + __iwl_read_prph(trans, reg) | mask); + iwl_release_nic_access(trans); + } spin_unlock_irqrestore(&trans->reg_lock, flags); } @@ -235,10 +238,11 @@ void iwl_set_bits_mask_prph(struct iwl_trans *trans, u32 reg, unsigned long flags; spin_lock_irqsave(&trans->reg_lock, flags); - iwl_grab_nic_access(trans); - __iwl_write_prph(trans, reg, - (__iwl_read_prph(trans, reg) & mask) | bits); - iwl_release_nic_access(trans); + if (likely(iwl_grab_nic_access(trans))) { + __iwl_write_prph(trans, reg, + (__iwl_read_prph(trans, reg) & mask) | bits); + iwl_release_nic_access(trans); + } spin_unlock_irqrestore(&trans->reg_lock, flags); } @@ -248,10 +252,11 @@ void iwl_clear_bits_prph(struct iwl_trans *trans, u32 reg, u32 mask) u32 val; spin_lock_irqsave(&trans->reg_lock, flags); - iwl_grab_nic_access(trans); - val = __iwl_read_prph(trans, reg); - __iwl_write_prph(trans, reg, (val & ~mask)); - iwl_release_nic_access(trans); + if (likely(iwl_grab_nic_access(trans))) { + val = __iwl_read_prph(trans, reg); + __iwl_write_prph(trans, reg, (val & ~mask)); + iwl_release_nic_access(trans); + } spin_unlock_irqrestore(&trans->reg_lock, flags); } @@ -263,15 +268,13 @@ void _iwl_read_targ_mem_words(struct iwl_trans *trans, u32 addr, u32 *vals = buf; spin_lock_irqsave(&trans->reg_lock, flags); - iwl_grab_nic_access(trans); - - iwl_write32(trans, HBUS_TARG_MEM_RADDR, addr); - rmb(); - - for (offs = 0; offs < words; offs++) - vals[offs] = iwl_read32(trans, HBUS_TARG_MEM_RDAT); - - iwl_release_nic_access(trans); + if (likely(iwl_grab_nic_access(trans))) { + iwl_write32(trans, HBUS_TARG_MEM_RADDR, addr); + rmb(); + for (offs = 0; offs < words; offs++) + vals[offs] = iwl_read32(trans, HBUS_TARG_MEM_RDAT); + iwl_release_nic_access(trans); + } spin_unlock_irqrestore(&trans->reg_lock, flags); } @@ -292,7 +295,7 @@ int _iwl_write_targ_mem_words(struct iwl_trans *trans, u32 addr, u32 *vals = buf; spin_lock_irqsave(&trans->reg_lock, flags); - if (!iwl_grab_nic_access(trans)) { + if (likely(iwl_grab_nic_access(trans))) { iwl_write32(trans, HBUS_TARG_MEM_WADDR, addr); wmb(); diff --git a/drivers/net/wireless/iwlwifi/iwl-io.h b/drivers/net/wireless/iwlwifi/iwl-io.h index 1136dc19936a..09b856768f62 100644 --- a/drivers/net/wireless/iwlwifi/iwl-io.h +++ b/drivers/net/wireless/iwlwifi/iwl-io.h @@ -61,7 +61,7 @@ int iwl_poll_direct_bit(struct iwl_trans *trans, u32 addr, u32 mask, int timeout); int iwl_grab_nic_access_silent(struct iwl_trans *trans); -int iwl_grab_nic_access(struct iwl_trans *trans); +bool iwl_grab_nic_access(struct iwl_trans *trans); void iwl_release_nic_access(struct iwl_trans *trans); u32 iwl_read_direct32(struct iwl_trans *trans, u32 reg); diff --git a/drivers/net/wireless/iwlwifi/iwl-mac80211.c b/drivers/net/wireless/iwlwifi/iwl-mac80211.c index bdcbbd0d3467..91a42c3261aa 100644 --- a/drivers/net/wireless/iwlwifi/iwl-mac80211.c +++ b/drivers/net/wireless/iwlwifi/iwl-mac80211.c @@ -445,7 +445,7 @@ static int iwlagn_mac_resume(struct ieee80211_hw *hw) if (iwlagn_hw_valid_rtc_data_addr(base)) { spin_lock_irqsave(&trans(priv)->reg_lock, flags); ret = iwl_grab_nic_access_silent(trans(priv)); - if (ret == 0) { + if (likely(ret == 0)) { iwl_write32(trans(priv), HBUS_TARG_MEM_RADDR, base); status = iwl_read32(trans(priv), HBUS_TARG_MEM_RDAT); iwl_release_nic_access(trans(priv)); diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c index 83cc60e8f607..5d1fc7b1b0a3 100644 --- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c +++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c @@ -745,7 +745,8 @@ static int iwl_print_event_log(struct iwl_trans *trans, u32 start_idx, /* Make sure device is powered up for SRAM reads */ spin_lock_irqsave(&trans->reg_lock, reg_flags); - iwl_grab_nic_access(trans); + if (unlikely(!iwl_grab_nic_access(trans))) + goto out_unlock; /* Set starting address; reads will auto-increment */ iwl_write32(trans, HBUS_TARG_MEM_RADDR, ptr); @@ -785,6 +786,7 @@ static int iwl_print_event_log(struct iwl_trans *trans, u32 start_idx, /* Allow device to power down */ iwl_release_nic_access(trans); +out_unlock: spin_unlock_irqrestore(&trans->reg_lock, reg_flags); return pos; } -- 2.20.1