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oxnas: sata_oxnas: refactoring phase 1

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locking for 2nd port and hwraid was added from vendor's GPL code which
doesn't comply with current kernel coding style.

 - moved all global variables into host_priv
 - renamed locks
 - sanetized acquire() and release() parameter list

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

SVN-Revision: 43766
v19.07.3_mercusys_ac12_duma
Felix Fietkau 10 years ago
parent 3113bf4cb8
commit feda47451f
3 changed files with 152 additions and 122 deletions
Show Stats Download Patch File Download Diff File

256
target/linux/oxnas/files/drivers/ata/sata_oxnas.c
Unescape Escape View File

@ -335,6 +335,8 @@ enum {
SATA_SCSI_STACK
};
typedef irqreturn_t (*oxnas_sata_isr_callback_t)(int, unsigned long, int);
struct sata_oxnas_host_priv {
void __iomem *port_base;
void __iomem *dmactl_base;
@ -353,12 +355,22 @@ struct sata_oxnas_host_priv {
struct reset_control *rst_sata;
struct reset_control *rst_link;
struct reset_control *rst_phy;
spinlock_t phy_lock;
spinlock_t core_lock;
int core_locked;
int reentrant_port_no;
int hw_lock_count;
int direct_lock_count;
void *locker_uid;
int current_locker_type;
int scsi_nonblocking_attempts;
oxnas_sata_isr_callback_t isr_callback;
void *isr_arg;
wait_queue_head_t fast_wait_queue;
wait_queue_head_t scsi_wait_queue;
};
typedef irqreturn_t (*ox820sata_isr_callback_t)(int, unsigned long, int);
static DEFINE_SPINLOCK(oxsphy_lock);
static DEFINE_SPINLOCK(oxsacs_lock);
struct sata_oxnas_port_priv {
void __iomem *port_base;
void __iomem *dmactl_base;
@ -375,22 +387,11 @@ static void sata_oxnas_tf_load(struct ata_port *ap,
static void sata_oxnas_irq_on(struct ata_port *ap);
static void sata_oxnas_post_reset_init(struct ata_port *ap);
static int sata_oxnas_acquire_hw(int port_no, int may_sleep,
int timeout_jiffies);
static void sata_oxnas_release_hw(unsigned int port_no);
static int sata_oxnas_acquire_hw(struct ata_port *ap, int may_sleep,
int timeout_jiffies);
static void sata_oxnas_release_hw(struct ata_port *ap);
static int core_locked = 0;
static int reentrant_port_no = -1;
static int hw_lock_count = 0;
static int direct_lock_count = 0;
static void *locker_uid = 0;
static int current_locker_type = SATA_UNLOCKED;
static const void *HW_LOCKER_UID = (void*)0xdeadbeef;
static DECLARE_WAIT_QUEUE_HEAD(fast_wait_queue);
static DECLARE_WAIT_QUEUE_HEAD(scsi_wait_queue);
static ox820sata_isr_callback_t ox820sata_isr_callback = NULL;
static unsigned long ox820sata_isr_arg = 0;
static int scsi_nonblocking_attempts = 0;
/***************************************************************************
* ASIC access
@ -451,14 +452,15 @@ void workaround5458(struct ata_host *ah)
*/
void sata_oxnas_link_write(struct ata_port *ap, unsigned int link_reg, u32 val)
{
struct sata_oxnas_port_priv *port_priv = ap->private_data;
void __iomem *port_base = port_priv->port_base;
struct sata_oxnas_port_priv *pd = ap->private_data;
struct sata_oxnas_host_priv *hd = ap->host->private_data;
void __iomem *port_base = pd->port_base;
u32 patience;
unsigned long flags;
DPRINTK("P%d [0x%02x]->0x%08x\n", ap->port_no, link_reg, val);
spin_lock_irqsave(&oxsphy_lock, flags);
spin_lock_irqsave(&hd->phy_lock, flags);
iowrite32(val, port_base + LINK_DATA);
/* accessed twice as a work around for a bug in the SATA abp bridge
@ -470,7 +472,7 @@ void sata_oxnas_link_write(struct ata_port *ap, unsigned int link_reg, u32 val)
if (ioread32(port_base + LINK_CONTROL) & 0x00000001)
break;
}
spin_unlock_irqrestore(&oxsphy_lock, flags);
spin_unlock_irqrestore(&hd->phy_lock, flags);
}
static int sata_oxnas_scr_write_port(struct ata_port *ap, unsigned int sc_reg,
@ -489,12 +491,13 @@ static int sata_oxnas_scr_write(struct ata_link *link, unsigned int sc_reg,
u32 sata_oxnas_link_read(struct ata_port *ap, unsigned int link_reg)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
struct sata_oxnas_host_priv *hd = ap->host->private_data;
void __iomem *port_base = pd->port_base;
u32 result;
u32 patience;
unsigned long flags;
spin_lock_irqsave(&oxsphy_lock, flags);
spin_lock_irqsave(&hd->phy_lock, flags);
/* accessed twice as a work around for a bug in the SATA abp bridge
* hardware (bug 6828) */
iowrite32(link_reg, port_base + LINK_RD_ADDR);
@ -508,7 +511,7 @@ u32 sata_oxnas_link_read(struct ata_port *ap, unsigned int link_reg)
DPRINTK("link read timed out for port %d\n", ap->port_no);
result = ioread32(port_base + LINK_DATA);
spin_unlock_irqrestore(&oxsphy_lock, flags);
spin_unlock_irqrestore(&hd->phy_lock, flags);
return result;
}
@ -641,9 +644,10 @@ void sata_oxnas_checkforhotplug(struct ata_port *ap)
* sata core.
*/
static int __acquire_sata_core(
struct ata_host *ah,
int port_no,
ox820sata_isr_callback_t callback,
unsigned long arg,
oxnas_sata_isr_callback_t callback,
void *arg,
int may_sleep,
int timeout_jiffies,
int hw_access,
@ -654,33 +658,40 @@ static int __acquire_sata_core(
int acquired = 0;
unsigned long flags;
int timed_out = 0;
struct sata_oxnas_host_priv *hd;
DEFINE_WAIT(wait);
spin_lock_irqsave(&oxsacs_lock, flags);
if (!ah)
return acquired;
hd = ah->private_data;
spin_lock_irqsave(&hd->core_lock, flags);
DPRINTK("Entered uid %p, port %d, h/w count %d, d count %d, callback %p, "
"hw_access %d, core_locked %d, reentrant_port_no %d, ox820sata_isr_callback %p\n",
uid, port_no, hw_lock_count, direct_lock_count, callback, hw_access,
core_locked, reentrant_port_no, ox820sata_isr_callback);
"hw_access %d, core_locked %d, reentrant_port_no %d, isr_callback %p\n",
uid, port_no, hd->hw_lock_count, hd->direct_lock_count, callback, hw_access,
hd->core_locked, hd->reentrant_port_no, hd->isr_callback);
while (!timed_out) {
if (core_locked || (!hw_access && scsi_nonblocking_attempts)) {
if (hd->core_locked || (!hw_access && hd->scsi_nonblocking_attempts)) {
/* Can only allow access if from SCSI/SATA stack and if
reentrant access is allowed and this access is to the same
port for which the lock is current held */
if (hw_access && (port_no == reentrant_port_no)) {
BUG_ON(!hw_lock_count);
++hw_lock_count;
if (hw_access && (port_no == hd->reentrant_port_no)) {
BUG_ON(!hd->hw_lock_count);
++(hd->hw_lock_count);
DPRINTK("Allow SCSI/SATA re-entrant access to uid %p port %d\n", uid, port_no);
acquired = 1;
break;
} else if (!hw_access) {
if ((locker_type == SATA_READER) && (current_locker_type == SATA_READER)) {
if ((locker_type == SATA_READER) && (hd->current_locker_type == SATA_READER)) {
WARN(1,
"Already locked by reader, uid %p, locker_uid %p, port %d, "
"h/w count %d, d count %d, hw_access %d\n", uid, locker_uid,
port_no, hw_lock_count, direct_lock_count, hw_access);
"h/w count %d, d count %d, hw_access %d\n", uid, hd->locker_uid,
port_no, hd->hw_lock_count, hd->direct_lock_count, hw_access);
goto check_uid;
}
@ -689,52 +700,52 @@ static int __acquire_sata_core(
}
check_uid:
WARN(uid == locker_uid, "Attempt to lock by locker type %d "
WARN(uid == hd->locker_uid, "Attempt to lock by locker type %d "
"uid %p, already locked by locker type %d with "
"locker_uid %p, port %d, h/w count %d, d count %d, "
"hw_access %d\n", locker_type, uid, current_locker_type,
locker_uid, port_no, hw_lock_count, direct_lock_count, hw_access);
"hw_access %d\n", locker_type, uid, hd->current_locker_type,
hd->locker_uid, port_no, hd->hw_lock_count, hd->direct_lock_count, hw_access);
}
} else {
WARN(hw_lock_count || direct_lock_count, "Core unlocked but counts "
WARN(hd->hw_lock_count || hd->direct_lock_count, "Core unlocked but counts "
"non-zero: uid %p, locker_uid %p, port %d, h/w count %d, "
"d count %d, hw_access %d\n", uid, locker_uid, port_no,
hw_lock_count, direct_lock_count, hw_access);
"d count %d, hw_access %d\n", uid, hd->locker_uid, port_no,
hd->hw_lock_count, hd->direct_lock_count, hw_access);
BUG_ON(current_locker_type != SATA_UNLOCKED);
BUG_ON(hd->current_locker_type != SATA_UNLOCKED);
WARN(locker_uid, "Attempt to lock uid %p when locker_uid %p is "
WARN(hd->locker_uid, "Attempt to lock uid %p when locker_uid %p is "
"non-zero, port %d, h/w count %d, d count %d, hw_access %d\n",
uid, locker_uid, port_no, hw_lock_count, direct_lock_count,
uid, hd->locker_uid, port_no, hd->hw_lock_count, hd->direct_lock_count,
hw_access);
if (!hw_access) {
/* Direct access attempting to acquire non-contented lock */
BUG_ON(!callback); // Must have callback for direct access
BUG_ON(reentrant_port_no != -1); // Sanity check lock state
BUG_ON(hd->reentrant_port_no != -1); // Sanity check lock state
ox820sata_isr_callback = callback;
ox820sata_isr_arg = arg;
++direct_lock_count;
hd->isr_callback = callback;
hd->isr_arg = arg;
++(hd->direct_lock_count);
current_locker_type = locker_type;
hd->current_locker_type = locker_type;
} else {
/* SCSI/SATA attempting to acquire non-contented lock */
BUG_ON(callback); // No callbacks for SCSI/SATA access
BUG_ON(arg); // No callback args for SCSI/SATA access
BUG_ON(ox820sata_isr_callback); // Sanity check lock state
BUG_ON(ox820sata_isr_arg); // Sanity check lock state
BUG_ON(hd->isr_callback); // Sanity check lock state
BUG_ON(hd->isr_arg); // Sanity check lock state
++hw_lock_count;
reentrant_port_no = port_no;
++(hd->hw_lock_count);
hd->reentrant_port_no = port_no;
current_locker_type = SATA_SCSI_STACK;
hd->current_locker_type = SATA_SCSI_STACK;
}
core_locked = 1;
hd->core_locked = 1;
hd->locker_uid = uid;
acquired = 1;
locker_uid = uid;
break;
}
@ -742,10 +753,10 @@ wait_for_lock:
if (!may_sleep) {
DPRINTK("Denying for uid %p locker_type %d, hw_access %d, port %d, "
"current_locker_type %d as cannot sleep\n", uid, locker_type,
hw_access, port_no, current_locker_type);
hw_access, port_no, hd->current_locker_type);
if (hw_access) {
++scsi_nonblocking_attempts;
++(hd->scsi_nonblocking_attempts);
}
break;
}
@ -753,9 +764,9 @@ wait_for_lock:
// Core is locked and we're allowed to sleep, so wait to be awoken when
// the core is unlocked
for (;;) {
prepare_to_wait(hw_access ? &scsi_wait_queue : &fast_wait_queue,
prepare_to_wait(hw_access ? &hd->scsi_wait_queue : &hd->fast_wait_queue,
&wait, TASK_UNINTERRUPTIBLE);
if (!core_locked && !(!hw_access && scsi_nonblocking_attempts)) {
if (!hd->core_locked && !(!hw_access && hd->scsi_nonblocking_attempts)) {
// We're going to use variables that will have been changed by
// the waker prior to clearing core_locked so we need to ensure
// we see changes to all those variables
@ -765,28 +776,28 @@ wait_for_lock:
if (time_after(jiffies, end)) {
printk("__acquire_sata_core() uid %p failing for port %d timed out, "
"locker_uid %p, h/w count %d, d count %d, callback %p, hw_access %d, "
"core_locked %d, reentrant_port_no %d, ox820sata_isr_callback %p, "
"ox820sata_isr_arg %p\n", uid, port_no, locker_uid,
hw_lock_count, direct_lock_count, callback, hw_access,
core_locked, reentrant_port_no, ox820sata_isr_callback,
(void*)ox820sata_isr_arg);
"core_locked %d, reentrant_port_no %d, isr_callback %p, "
"isr_arg %p\n", uid, port_no, hd->locker_uid,
hd->hw_lock_count, hd->direct_lock_count, callback, hw_access,
hd->core_locked, hd->reentrant_port_no, hd->isr_callback,
hd->isr_arg);
timed_out = 1;
break;
}
spin_unlock_irqrestore(&oxsacs_lock, flags);
spin_unlock_irqrestore(&hd->core_lock, flags);
if (!schedule_timeout(4*HZ)) {
printk(KERN_INFO "__acquire_sata_core() uid %p, locker_uid %p, "
"timed-out of schedule(), checking overall timeout\n",
uid, locker_uid);
uid, hd->locker_uid);
}
spin_lock_irqsave(&oxsacs_lock, flags);
spin_lock_irqsave(&hd->core_lock, flags);
}
finish_wait(hw_access ? &scsi_wait_queue : &fast_wait_queue, &wait);
finish_wait(hw_access ? &hd->scsi_wait_queue : &hd->fast_wait_queue, &wait);
}
if (hw_access && acquired) {
if (scsi_nonblocking_attempts) {
scsi_nonblocking_attempts = 0;
if (hd->scsi_nonblocking_attempts) {
hd->scsi_nonblocking_attempts = 0;
}
// Wake any other SCSI/SATA waiters so they can get reentrant access to
@ -794,39 +805,41 @@ wait_for_lock:
// locked by fast access, or SCSI/SATA access to other port, then can
// have >1 SCSI/SATA waiters on the wait list so want to give reentrant
// accessors a chance to get access ASAP
if (!list_empty(&scsi_wait_queue.task_list)) {
wake_up(&scsi_wait_queue);
if (!list_empty(&hd->scsi_wait_queue.task_list)) {
wake_up(&hd->scsi_wait_queue);
}
}
DPRINTK("Leaving uid %p with acquired = %d, port %d, callback %p\n", uid, acquired, port_no, callback);
spin_unlock_irqrestore(&oxsacs_lock, flags);
spin_unlock_irqrestore(&hd->core_lock, flags);
return acquired;
}
int sata_core_has_fast_waiters(void)
int sata_core_has_fast_waiters(struct ata_host *ah)
{
int has_waiters;
unsigned long flags;
struct sata_oxnas_host_priv *hd = ah->private_data;
spin_lock_irqsave(&oxsacs_lock, flags);
has_waiters = !list_empty(&fast_wait_queue.task_list);
spin_unlock_irqrestore(&oxsacs_lock, flags);
spin_lock_irqsave(&hd->core_lock, flags);
has_waiters = !list_empty(&hd->fast_wait_queue.task_list);
spin_unlock_irqrestore(&hd->core_lock, flags);
return has_waiters;
}
EXPORT_SYMBOL(sata_core_has_fast_waiters);
int sata_core_has_scsi_waiters(void)
int sata_core_has_scsi_waiters(struct ata_host *ah)
{
int has_waiters;
unsigned long flags;
struct sata_oxnas_host_priv *hd = ah->private_data;
spin_lock_irqsave(&oxsacs_lock, flags);
has_waiters = scsi_nonblocking_attempts || !list_empty(&scsi_wait_queue.task_list);
spin_unlock_irqrestore(&oxsacs_lock, flags);
spin_lock_irqsave(&hd->core_lock, flags);
has_waiters = hd->scsi_nonblocking_attempts || !list_empty(&hd->scsi_wait_queue.task_list);
spin_unlock_irqrestore(&hd->core_lock, flags);
return has_waiters;
}
@ -839,64 +852,65 @@ EXPORT_SYMBOL(sata_core_has_scsi_waiters);
* port may be operated on at once.
*/
static int sata_oxnas_acquire_hw(
int port_no,
struct ata_port *ap,
int may_sleep,
int timeout_jiffies)
{
return __acquire_sata_core(port_no, NULL, 0, may_sleep, timeout_jiffies, 1, (void*)HW_LOCKER_UID, SATA_SCSI_STACK);
return __acquire_sata_core(ap->host, ap->port_no, NULL, 0, may_sleep, timeout_jiffies, 1, (void*)HW_LOCKER_UID, SATA_SCSI_STACK);
}
/*
* operation to release ownership of the SATA hardware
*/
static void sata_oxnas_release_hw(unsigned int port_no)
static void sata_oxnas_release_hw(struct ata_port *ap)
{
unsigned long flags;
int released = 0;
struct sata_oxnas_host_priv *hd = ap->host->private_data;
spin_lock_irqsave(&oxsacs_lock, flags);
spin_lock_irqsave(&hd->core_lock, flags);
DPRINTK("Entered port_no = %d, h/w count %d, d count %d, core locked = %d, "
"reentrant_port_no = %d, ox820sata_isr_callback %p\n", port_no,
hw_lock_count, direct_lock_count, core_locked, reentrant_port_no, ox820sata_isr_callback);
"reentrant_port_no = %d, isr_callback %p\n", ap->port_no,
hd->hw_lock_count, hd->direct_lock_count, hd->core_locked, hd->reentrant_port_no, hd->isr_callback);
if (!core_locked) {
if (!hd->core_locked) {
/* Nobody holds the SATA lock */
printk(KERN_WARNING "Nobody holds SATA lock, port_no %d\n", port_no);
printk(KERN_WARNING "Nobody holds SATA lock, port_no %d\n", ap->port_no);
released = 1;
} else if (!hw_lock_count) {
} else if (!hd->hw_lock_count) {
/* SCSI/SATA has released without holding the lock */
printk(KERN_WARNING "SCSI/SATA does not hold SATA lock, port_no %d\n", port_no);
printk(KERN_WARNING "SCSI/SATA does not hold SATA lock, port_no %d\n", ap->port_no);
} else {
/* Trap incorrect usage */
BUG_ON(reentrant_port_no == -1);
BUG_ON(port_no != reentrant_port_no);
BUG_ON(direct_lock_count);
BUG_ON(current_locker_type != SATA_SCSI_STACK);
BUG_ON(hd->reentrant_port_no == -1);
BUG_ON(ap->port_no != hd->reentrant_port_no);
BUG_ON(hd->direct_lock_count);
BUG_ON(hd->current_locker_type != SATA_SCSI_STACK);
WARN(!locker_uid || (locker_uid != HW_LOCKER_UID), "Invalid locker "
WARN(!hd->locker_uid || (hd->locker_uid != HW_LOCKER_UID), "Invalid locker "
"uid %p, h/w count %d, d count %d, reentrant_port_no %d, "
"core_locked %d, ox820sata_isr_callback %p\n", locker_uid,
hw_lock_count, direct_lock_count, reentrant_port_no, core_locked,
ox820sata_isr_callback);
"core_locked %d, isr_callback %p\n", hd->locker_uid,
hd->hw_lock_count, hd->direct_lock_count, hd->reentrant_port_no,
hd->core_locked, hd->isr_callback);
if (--hw_lock_count) {
DPRINTK("Still nested port_no %d\n", port_no);
if (--(hd->hw_lock_count)) {
DPRINTK("Still nested port_no %d\n", ap->port_no);
} else {
DPRINTK("Release port_no %d\n", port_no);
reentrant_port_no = -1;
ox820sata_isr_callback = NULL;
current_locker_type = SATA_UNLOCKED;
locker_uid = 0;
core_locked = 0;
DPRINTK("Release port_no %d\n", ap->port_no);
hd->reentrant_port_no = -1;
hd->isr_callback = NULL;
hd->current_locker_type = SATA_UNLOCKED;
hd->locker_uid = 0;
hd->core_locked = 0;
released = 1;
wake_up(!list_empty(&scsi_wait_queue.task_list) ? &scsi_wait_queue : &fast_wait_queue);
wake_up(!list_empty(&hd->scsi_wait_queue.task_list) ? &hd->scsi_wait_queue : &hd->fast_wait_queue);
}
}
DPRINTK("Leaving, port_no %d, count %d\n", port_no, hw_lock_count);
DPRINTK("Leaving, port_no %d, count %d\n", ap->port_no, hd->hw_lock_count);
spin_unlock_irqrestore(&oxsacs_lock, flags);
spin_unlock_irqrestore(&hd->core_lock, flags);
/* CONFIG_SATA_OX820_DIRECT_HWRAID */
/* if (released)
@ -1468,7 +1482,7 @@ static int sata_oxnas_qc_new(struct ata_port *ap)
if (hd->port_frozen || hd->port_in_eh)
return 1;
else
return !sata_oxnas_acquire_hw(ap->port_no, 0, 0);
return !sata_oxnas_acquire_hw(ap, 0, 0);
}
/**
@ -1477,7 +1491,7 @@ static int sata_oxnas_qc_new(struct ata_port *ap)
static void sata_oxnas_qc_free(struct ata_queued_cmd *qc)
{
DPRINTK("\n");
sata_oxnas_release_hw(qc->ap->port_no);
sata_oxnas_release_hw(qc->ap);
}
static void sata_oxnas_freeze(struct ata_port* ap)
@ -2271,6 +2285,20 @@ static int sata_oxnas_probe(struct platform_device *ofdev)
host->private_data = host_priv;
host->iomap = port_base;
/* initialize core locking and queues */
init_waitqueue_head(&host_priv->fast_wait_queue);
init_waitqueue_head(&host_priv->scsi_wait_queue);
spin_lock_init(&host_priv->phy_lock);
spin_lock_init(&host_priv->core_lock);
host_priv->core_locked = 0;
host_priv->reentrant_port_no = -1;
host_priv->hw_lock_count = 0;
host_priv->direct_lock_count = 0;
host_priv->locker_uid = 0;
host_priv->current_locker_type = SATA_UNLOCKED;
host_priv->isr_arg = NULL;
host_priv->isr_callback = NULL;
/* initialize host controller */
retval = sata_oxnas_init_controller(host);
if (retval)

9
target/linux/oxnas/patches-3.14/999-libata-hacks.patch
Unescape Escape View File

@ -6,9 +6,9 @@ Index: linux-3.18-rc7/drivers/ata/libata-core.c
return AC_ERR_SYSTEM;
}
+ if (ap->ops->acquire_hw && !ap->ops->acquire_hw(ap->port_no, 0, 0)) {
+ if (ap->ops->acquire_hw && !ap->ops->acquire_hw(ap, 0, 0)) {
+ spin_unlock_irqrestore(ap->lock, flags);
+ if (!ap->ops->acquire_hw(ap->port_no, 1, (2*HZ))) {
+ if (!ap->ops->acquire_hw(ap, 1, (2*HZ))) {
+ return AC_ERR_TIMEOUT;
+ }
+ spin_lock_irqsave(ap->lock, flags);
@ -49,11 +49,12 @@ Index: linux-3.18-rc7/include/linux/libata.h
/*
* Configuration and exception handling
@@ -974,6 +976,8 @@ struct ata_port_operations {
@@ -974,6 +976,9 @@ struct ata_port_operations {
void (*phy_reset)(struct ata_port *ap);
void (*eng_timeout)(struct ata_port *ap);
+ int (*acquire_hw)(int port_no, int may_sleep, int timeout_jiffies);
+ int (*acquire_hw)(struct ata_port *ap, int may_sleep,
+ int timeout_jiffies);
+
/*
* ->inherits must be the last field and all the preceding

9
target/linux/oxnas/patches-3.18/999-libata-hacks.patch
Unescape Escape View File

@ -6,9 +6,9 @@ Index: linux-3.18-rc7/drivers/ata/libata-core.c
return AC_ERR_SYSTEM;
}
+ if (ap->ops->acquire_hw && !ap->ops->acquire_hw(ap->port_no, 0, 0)) {
+ if (ap->ops->acquire_hw && !ap->ops->acquire_hw(ap, 0, 0)) {
+ spin_unlock_irqrestore(ap->lock, flags);
+ if (!ap->ops->acquire_hw(ap->port_no, 1, (2*HZ))) {
+ if (!ap->ops->acquire_hw(ap, 1, (2*HZ))) {
+ return AC_ERR_TIMEOUT;
+ }
+ spin_lock_irqsave(ap->lock, flags);
@ -49,11 +49,12 @@ Index: linux-3.18-rc7/include/linux/libata.h
/*
* Configuration and exception handling
@@ -974,6 +976,8 @@ struct ata_port_operations {
@@ -974,6 +976,9 @@ struct ata_port_operations {
void (*phy_reset)(struct ata_port *ap);
void (*eng_timeout)(struct ata_port *ap);
+ int (*acquire_hw)(int port_no, int may_sleep, int timeout_jiffies);
+ int (*acquire_hw)(struct ata_port *ap, int may_sleep,
+ int timeout_jiffies);
+
/*
* ->inherits must be the last field and all the preceding

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