1 files changed, 63 insertions, 55 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 7f0d81c0ec9..453ba1e534e 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -95,10 +95,11 @@ struct acpi_ec_query_handler {
 	u8 query_bit;
 };
 
-struct transaction_data {
+struct transaction {
 	const u8 *wdata;
 	u8 *rdata;
 	unsigned short irq_count;
+	u8 command;
 	u8 wlen;
 	u8 rlen;
 };
@@ -113,8 +114,8 @@ static struct acpi_ec {
 	struct mutex lock;
 	wait_queue_head_t wait;
 	struct list_head list;
-	struct transaction_data *t;
-	spinlock_t t_lock;
+	struct transaction *curr;
+	spinlock_t curr_lock;
 } *boot_ec, *first_ec;
 
 /* 
@@ -176,37 +177,37 @@ static int ec_transaction_done(struct acpi_ec *ec)
 {
 	unsigned long flags;
 	int ret = 0;
-	spin_lock_irqsave(&ec->t_lock, flags);
-	if (!ec->t || (!ec->t->wlen && !ec->t->rlen))
+	spin_lock_irqsave(&ec->curr_lock, flags);
+	if (!ec->curr || (!ec->curr->wlen && !ec->curr->rlen))
 		ret = 1;
-	spin_unlock_irqrestore(&ec->t_lock, flags);
+	spin_unlock_irqrestore(&ec->curr_lock, flags);
 	return ret;
 }
 
 static void gpe_transaction(struct acpi_ec *ec, u8 status)
 {
 	unsigned long flags;
-	spin_lock_irqsave(&ec->t_lock, flags);
-	if (!ec->t)
+	spin_lock_irqsave(&ec->curr_lock, flags);
+	if (!ec->curr)
 		goto unlock;
-	if (ec->t->wlen > 0) {
+	if (ec->curr->wlen > 0) {
 		if ((status & ACPI_EC_FLAG_IBF) == 0) {
-			acpi_ec_write_data(ec, *(ec->t->wdata++));
-			--ec->t->wlen;
+			acpi_ec_write_data(ec, *(ec->curr->wdata++));
+			--ec->curr->wlen;
 		} else
 			/* false interrupt, state didn't change */
-			++ec->t->irq_count;
+			++ec->curr->irq_count;
 
-	} else if (ec->t->rlen > 0) {
+	} else if (ec->curr->rlen > 0) {
 		if ((status & ACPI_EC_FLAG_OBF) == 1) {
-			*(ec->t->rdata++) = acpi_ec_read_data(ec);
-			--ec->t->rlen;
+			*(ec->curr->rdata++) = acpi_ec_read_data(ec);
+			--ec->curr->rlen;
 		} else
 			/* false interrupt, state didn't change */
-			++ec->t->irq_count;
+			++ec->curr->irq_count;
 	}
 unlock:
-	spin_unlock_irqrestore(&ec->t_lock, flags);
+	spin_unlock_irqrestore(&ec->curr_lock, flags);
 }
 
 static int acpi_ec_wait(struct acpi_ec *ec)
@@ -248,15 +249,11 @@ static int ec_poll(struct acpi_ec *ec)
 	return -ETIME;
 }
 
-static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
-					const u8 * wdata, unsigned wdata_len,
-					u8 * rdata, unsigned rdata_len,
+static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
+					struct transaction *t,
 					int force_poll)
 {
 	unsigned long tmp;
-	struct transaction_data t = {.wdata = wdata, .rdata = rdata,
-				     .wlen = wdata_len, .rlen = rdata_len,
-				     .irq_count = 0};
 	int ret = 0;
 	pr_debug(PREFIX "transaction start\n");
 	/* disable GPE during transaction if storm is detected */
@@ -265,29 +262,30 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
 		acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
 	}
 	/* start transaction */
-	spin_lock_irqsave(&ec->t_lock, tmp);
+	spin_lock_irqsave(&ec->curr_lock, tmp);
 	/* following two actions should be kept atomic */
-	ec->t = &t;
-	acpi_ec_write_cmd(ec, command);
-	if (command == ACPI_EC_COMMAND_QUERY)
+	t->irq_count = 0;
+	ec->curr = t;
+	acpi_ec_write_cmd(ec, ec->curr->command);
+	if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
 		clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
-	spin_unlock_irqrestore(&ec->t_lock, tmp);
+	spin_unlock_irqrestore(&ec->curr_lock, tmp);
 	/* if we selected poll mode or failed in GPE-mode do a poll loop */
 	if (force_poll ||
 	    !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ||
 	    acpi_ec_wait(ec))
 		ret = ec_poll(ec);
 	pr_debug(PREFIX "transaction end\n");
-	spin_lock_irqsave(&ec->t_lock, tmp);
-	ec->t = NULL;
-	spin_unlock_irqrestore(&ec->t_lock, tmp);
+	spin_lock_irqsave(&ec->curr_lock, tmp);
+	ec->curr = NULL;
+	spin_unlock_irqrestore(&ec->curr_lock, tmp);
 	if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
 		/* check if we received SCI during transaction */
 		ec_check_sci(ec, acpi_ec_read_status(ec));
 		/* it is safe to enable GPE outside of transaction */
 		acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
 	} else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
-		   t.irq_count > ACPI_EC_STORM_THRESHOLD) {
+		   t->irq_count > ACPI_EC_STORM_THRESHOLD) {
 		pr_debug(PREFIX "GPE storm detected\n");
 		set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
 	}
@@ -300,17 +298,15 @@ static int ec_check_ibf0(struct acpi_ec *ec)
 	return (status & ACPI_EC_FLAG_IBF) == 0;
 }
 
-static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
-			       const u8 * wdata, unsigned wdata_len,
-			       u8 * rdata, unsigned rdata_len,
+static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t,
 			       int force_poll)
 {
 	int status;
 	u32 glk;
-	if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
+	if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
 		return -EINVAL;
-	if (rdata)
-		memset(rdata, 0, rdata_len);
+	if (t->rdata)
+		memset(t->rdata, 0, t->rlen);
 	mutex_lock(&ec->lock);
 	if (ec->global_lock) {
 		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
@@ -326,10 +322,7 @@ static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
 		status = -ETIME;
 		goto end;
 	}
-	status = acpi_ec_transaction_unlocked(ec, command,
-					      wdata, wdata_len,
-					      rdata, rdata_len,
-					      force_poll);
+	status = acpi_ec_transaction_unlocked(ec, t, force_poll);
 end:
 	if (ec->global_lock)
 		acpi_release_global_lock(glk);
@@ -345,23 +338,32 @@ unlock:
 int acpi_ec_burst_enable(struct acpi_ec *ec)
 {
 	u8 d;
-	return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0);
+	struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
+				.wdata = NULL, .rdata = &d,
+				.wlen = 0, .rlen = 1};
+
+	return acpi_ec_transaction(ec, &t, 0);
 }
 
 int acpi_ec_burst_disable(struct acpi_ec *ec)
 {
+	struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
+				.wdata = NULL, .rdata = NULL,
+				.wlen = 0, .rlen = 0};
+
 	return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
-		acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE,
-			NULL, 0, NULL, 0, 0) : 0;
+				acpi_ec_transaction(ec, &t, 0) : 0;
 }
 
 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
 {
 	int result;
 	u8 d;
+	struct transaction t = {.command = ACPI_EC_COMMAND_READ,
+				.wdata = &address, .rdata = &d,
+				.wlen = 1, .rlen = 1};
 
-	result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ,
-				     &address, 1, &d, 1, 0);
+	result = acpi_ec_transaction(ec, &t, 0);
 	*data = d;
 	return result;
 }
@@ -369,8 +371,11 @@ static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
 static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
 {
 	u8 wdata[2] = { address, data };
-	return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE,
-				   wdata, 2, NULL, 0, 0);
+	struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
+				.wdata = wdata, .rdata = NULL,
+				.wlen = 2, .rlen = 0};
+
+	return acpi_ec_transaction(ec, &t, 0);
 }
 
 /*
@@ -432,12 +437,13 @@ int ec_transaction(u8 command,
 		   u8 * rdata, unsigned rdata_len,
 		   int force_poll)
 {
+	struct transaction t = {.command = command,
+				.wdata = wdata, .rdata = rdata,
+				.wlen = wdata_len, .rlen = rdata_len};
 	if (!first_ec)
 		return -ENODEV;
 
-	return acpi_ec_transaction(first_ec, command, wdata,
-				   wdata_len, rdata, rdata_len,
-				   force_poll);
+	return acpi_ec_transaction(first_ec, &t, force_poll);
 }
 
 EXPORT_SYMBOL(ec_transaction);
@@ -446,7 +452,9 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
 {
 	int result;
 	u8 d;
-
+	struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
+				.wdata = NULL, .rdata = &d,
+				.wlen = 0, .rlen = 1};
 	if (!ec || !data)
 		return -EINVAL;
 
@@ -456,7 +464,7 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
 	 * bit to be cleared (and thus clearing the interrupt source).
 	 */
 
-	result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0);
+	result = acpi_ec_transaction(ec, &t, 0);
 	if (result)
 		return result;
 
@@ -696,7 +704,7 @@ static struct acpi_ec *make_acpi_ec(void)
 	mutex_init(&ec->lock);
 	init_waitqueue_head(&ec->wait);
 	INIT_LIST_HEAD(&ec->list);
-	spin_lock_init(&ec->t_lock);
+	spin_lock_init(&ec->curr_lock);
 	return ec;
 }