From: Stanislaw Gruszka <sgruszka@redhat.com>
To: "John W. Linville" <linville@tuxdriver.com>
Cc: linux-wireless@vger.kernel.org, Stanislaw Gruszka <sgruszka@redhat.com>
Subject: [PATCH 02/24] iwlegacy: always check if got h/w access before write
Date: Mon, 13 Feb 2012 11:23:09 +0100 [thread overview]
Message-ID: <1329128611-6815-3-git-send-email-sgruszka@redhat.com> (raw)
In-Reply-To: <1329128611-6815-1-git-send-email-sgruszka@redhat.com>
Before we write to the device register always check if
_il_grap_nic_access() was successful.
Change type return type _il_grap_nic_access() to bool, and
add likely()/unlikely() statements.
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
drivers/net/wireless/iwlegacy/4965-mac.c | 2 +-
drivers/net/wireless/iwlegacy/common.c | 10 +++++-----
drivers/net/wireless/iwlegacy/common.h | 27 +++++++++++++++------------
3 files changed, 21 insertions(+), 18 deletions(-)
diff --git a/drivers/net/wireless/iwlegacy/4965-mac.c b/drivers/net/wireless/iwlegacy/4965-mac.c
index 235812a..90c9bfb 100644
--- a/drivers/net/wireless/iwlegacy/4965-mac.c
+++ b/drivers/net/wireless/iwlegacy/4965-mac.c
@@ -3778,7 +3778,7 @@ il4965_perform_ct_kill_task(struct il_priv *il)
_il_rd(il, CSR_UCODE_DRV_GP1);
spin_lock_irqsave(&il->reg_lock, flags);
- if (!_il_grab_nic_access(il))
+ if (likely(_il_grab_nic_access(il)))
_il_release_nic_access(il);
spin_unlock_irqrestore(&il->reg_lock, flags);
}
diff --git a/drivers/net/wireless/iwlegacy/common.c b/drivers/net/wireless/iwlegacy/common.c
index 3900967..6dbd11f 100644
--- a/drivers/net/wireless/iwlegacy/common.c
+++ b/drivers/net/wireless/iwlegacy/common.c
@@ -81,7 +81,7 @@ il_clear_bit(struct il_priv *p, u32 r, u32 m)
}
EXPORT_SYMBOL(il_clear_bit);
-int
+bool
_il_grab_nic_access(struct il_priv *il)
{
int ret;
@@ -116,10 +116,10 @@ _il_grab_nic_access(struct il_priv *il)
WARN_ONCE(1, "Timeout waiting for ucode processor access "
"(CSR_GP_CNTRL 0x%08x)\n", val);
_il_wr(il, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
- return -EIO;
+ return false;
}
- return 0;
+ return true;
}
EXPORT_SYMBOL_GPL(_il_grab_nic_access);
@@ -161,7 +161,7 @@ il_wr_prph(struct il_priv *il, u32 addr, u32 val)
unsigned long reg_flags;
spin_lock_irqsave(&il->reg_lock, reg_flags);
- if (!_il_grab_nic_access(il)) {
+ if (likely(_il_grab_nic_access(il))) {
_il_wr_prph(il, addr, val);
_il_release_nic_access(il);
}
@@ -194,7 +194,7 @@ il_write_targ_mem(struct il_priv *il, u32 addr, u32 val)
unsigned long reg_flags;
spin_lock_irqsave(&il->reg_lock, reg_flags);
- if (!_il_grab_nic_access(il)) {
+ if (likely(_il_grab_nic_access(il))) {
_il_wr(il, HBUS_TARG_MEM_WADDR, addr);
wmb();
_il_wr(il, HBUS_TARG_MEM_WDAT, val);
diff --git a/drivers/net/wireless/iwlegacy/common.h b/drivers/net/wireless/iwlegacy/common.h
index 7080956..1dfaa58 100644
--- a/drivers/net/wireless/iwlegacy/common.h
+++ b/drivers/net/wireless/iwlegacy/common.h
@@ -2103,7 +2103,7 @@ irqreturn_t il_isr(int irq, void *data);
extern void il_set_bit(struct il_priv *p, u32 r, u32 m);
extern void il_clear_bit(struct il_priv *p, u32 r, u32 m);
-extern int _il_grab_nic_access(struct il_priv *il);
+extern bool _il_grab_nic_access(struct il_priv *il);
extern int _il_poll_bit(struct il_priv *il, u32 addr, u32 bits, u32 mask, int timeout);
extern int il_poll_bit(struct il_priv *il, u32 addr, u32 mask, int timeout);
extern u32 il_rd_prph(struct il_priv *il, u32 reg);
@@ -2168,7 +2168,7 @@ il_wr(struct il_priv *il, u32 reg, u32 value)
unsigned long reg_flags;
spin_lock_irqsave(&il->reg_lock, reg_flags);
- if (!_il_grab_nic_access(il)) {
+ if (likely(_il_grab_nic_access(il))) {
_il_wr(il, reg, value);
_il_release_nic_access(il);
}
@@ -2197,9 +2197,10 @@ il_set_bits_prph(struct il_priv *il, u32 reg, u32 mask)
unsigned long reg_flags;
spin_lock_irqsave(&il->reg_lock, reg_flags);
- _il_grab_nic_access(il);
- _il_wr_prph(il, reg, (_il_rd_prph(il, reg) | mask));
- _il_release_nic_access(il);
+ if (likely(_il_grab_nic_access(il))) {
+ _il_wr_prph(il, reg, (_il_rd_prph(il, reg) | mask));
+ _il_release_nic_access(il);
+ }
spin_unlock_irqrestore(&il->reg_lock, reg_flags);
}
@@ -2209,9 +2210,10 @@ il_set_bits_mask_prph(struct il_priv *il, u32 reg, u32 bits, u32 mask)
unsigned long reg_flags;
spin_lock_irqsave(&il->reg_lock, reg_flags);
- _il_grab_nic_access(il);
- _il_wr_prph(il, reg, ((_il_rd_prph(il, reg) & mask) | bits));
- _il_release_nic_access(il);
+ if (likely(_il_grab_nic_access(il))) {
+ _il_wr_prph(il, reg, ((_il_rd_prph(il, reg) & mask) | bits));
+ _il_release_nic_access(il);
+ }
spin_unlock_irqrestore(&il->reg_lock, reg_flags);
}
@@ -2222,10 +2224,11 @@ il_clear_bits_prph(struct il_priv *il, u32 reg, u32 mask)
u32 val;
spin_lock_irqsave(&il->reg_lock, reg_flags);
- _il_grab_nic_access(il);
- val = _il_rd_prph(il, reg);
- _il_wr_prph(il, reg, (val & ~mask));
- _il_release_nic_access(il);
+ if (likely(_il_grab_nic_access(il))) {
+ val = _il_rd_prph(il, reg);
+ _il_wr_prph(il, reg, (val & ~mask));
+ _il_release_nic_access(il);
+ }
spin_unlock_irqrestore(&il->reg_lock, reg_flags);
}
--
1.7.1
next prev parent reply other threads:[~2012-02-13 10:23 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-13 10:23 [PATCH 00/24] iwlegacy update 2012-02-13 Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 01/24] iwlegacy: dump stack when fail to gain access to the device Stanislaw Gruszka
2012-02-13 10:23 ` Stanislaw Gruszka [this message]
2012-02-13 10:23 ` [PATCH 03/24] iwlegacy: cleanup/fix memory barriers Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 04/24] iwlegacy: use writeb,writel,readl directly Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 05/24] iwlegacy: regulatory_bands is not an ops Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 06/24] iwlegacy: gather all 4965 handlers in one place Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 07/24] iwlegacy: move debugfs_ops to il_priv Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 08/24] iwlegacy: remove temp_ops Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 09/24] iwlegacy: merge eeprom_ops into lib_ops Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 10/24] iwlegacy: remove il_apm_ops Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 11/24] iwlegacy: merge il_lib_ops into il_ops Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 12/24] iwlegacy: merge all ops structures into one Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 13/24] iwlegacy: get rid of tx/rx traffic log Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 14/24] iwlegacy: improve mac operation debuggability a bit Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 15/24] iwleagcy: remove old comments Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 16/24] iwleagcy: fix ident code damage Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 17/24] iwlegacy: do not grab nic access if rfkill Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 18/24] iwlegacy: check correct il_poll_bit error value Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 19/24] iwlegacy: small il4965_set_hw_ready cleanup Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 20/24] iwlegacy: only enable rfkill interrupt during UP Stanislaw Gruszka
2012-02-13 16:19 ` Dan Williams
2012-02-13 16:43 ` Stanislaw Gruszka
2012-02-14 7:50 ` [PATCH 20/24 v2] iwlegacy: enable only rfkill interrupt when rfkill switch is on during IFF_UP Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 21/24] iwlegacy: small queue initializations cleanup Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 22/24] iwlegacy: s/S_RF_KILL_HW/S_RFKILL/g Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 23/24] iwlegacy: s/il_txq_mem/il_free_txq_mem/g Stanislaw Gruszka
2012-02-13 10:23 ` [PATCH 24/24] iwlegacy: remove il_is_rfkill_hw Stanislaw Gruszka
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