linux-omap2 git: bump to 2.6.26rc2, add patch to fix boot on beagleboard

1 files changed, 220 insertions, 0 deletions

diff --git a/packages/linux/linux-omap2-git/beagleboard/convert-rwsem-to-rwclock.patch b/packages/linux/linux-omap2-git/beagleboard/convert-rwsem-to-rwclock.patch
new file mode 100644
index 0000000000..311260d790
--- /dev/null
+++ b/packages/linux/linux-omap2-git/beagleboard/convert-rwsem-to-rwclock.patch
@@ -0,0 +1,220 @@
+The generic rwsem implementation of down_read() and down_write() does not

+save and restore interrupt state.  This causes powerdomain code to

+inadvertently enable interrupts early in the boot process, causing

+init/main.c to complain.   This patch converts powerdomain locking to

+r-w spinlocks instead.

+

+I'm also curious to know if this fixes the BeagleBoard boot problem.

+

+Signed-off-by: Paul Walmsley <paul@pwsan.com>

+---

+

+ arch/arm/mach-omap2/powerdomain.c |   46 ++++++++++++++++++++++---------------

+ 1 files changed, 27 insertions(+), 19 deletions(-)

+

+

+diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c

+index 939efe4..0a6caaf 100644

+--- a/arch/arm/mach-omap2/powerdomain.c

++++ b/arch/arm/mach-omap2/powerdomain.c

+@@ -18,7 +18,7 @@

+ #include <linux/module.h>

+ #include <linux/types.h>

+ #include <linux/delay.h>

+-#include <linux/rwsem.h>

++#include <linux/spinlock.h>

+ #include <linux/list.h>

+ #include <linux/errno.h>

+ #include <linux/err.h>

+@@ -38,10 +38,10 @@

+ static LIST_HEAD(pwrdm_list);

+ 

+ /*

+- * pwrdm_rwsem protects pwrdm_list add and del ops - also reused to

++ * pwrdm_rwlock protects pwrdm_list add and del ops - also reused to

+  * protect pwrdm_clkdms[] during clkdm add/del ops

+  */

+-static DECLARE_RWSEM(pwrdm_rwsem);

++static DEFINE_RWLOCK(pwrdm_rwlock);

+ 

+ 

+ /* Private functions */

+@@ -131,6 +131,7 @@ void pwrdm_init(struct powerdomain **pwrdm_list)

+  */

+ int pwrdm_register(struct powerdomain *pwrdm)

+ {

++	unsigned long flags;

+ 	int ret = -EINVAL;

+ 

+ 	if (!pwrdm)

+@@ -139,7 +140,7 @@ int pwrdm_register(struct powerdomain *pwrdm)

+ 	if (!omap_chip_is(pwrdm->omap_chip))

+ 		return -EINVAL;

+ 

+-	down_write(&pwrdm_rwsem);

++	write_lock_irqsave(&pwrdm_rwlock, flags);

+ 	if (_pwrdm_lookup(pwrdm->name)) {

+ 		ret = -EEXIST;

+ 		goto pr_unlock;

+@@ -151,7 +152,7 @@ int pwrdm_register(struct powerdomain *pwrdm)

+ 	ret = 0;

+ 

+ pr_unlock:

+-	up_write(&pwrdm_rwsem);

++	write_unlock_irqrestore(&pwrdm_rwlock, flags);

+ 

+ 	return ret;

+ }

+@@ -165,12 +166,14 @@ pr_unlock:

+  */

+ int pwrdm_unregister(struct powerdomain *pwrdm)

+ {

++	unsigned long flags;

++

+ 	if (!pwrdm)

+ 		return -EINVAL;

+ 

+-	down_write(&pwrdm_rwsem);

++	write_lock_irqsave(&pwrdm_rwlock, flags);

+ 	list_del(&pwrdm->node);

+-	up_write(&pwrdm_rwsem);

++	write_unlock_irqrestore(&pwrdm_rwlock, flags);

+ 

+ 	pr_debug("powerdomain: unregistered %s\n", pwrdm->name);

+ 

+@@ -187,13 +190,14 @@ int pwrdm_unregister(struct powerdomain *pwrdm)

+ struct powerdomain *pwrdm_lookup(const char *name)

+ {

+ 	struct powerdomain *pwrdm;

++	unsigned long flags;

+ 

+ 	if (!name)

+ 		return NULL;

+ 

+-	down_read(&pwrdm_rwsem);

++	read_lock_irqsave(&pwrdm_rwlock, flags);

+ 	pwrdm = _pwrdm_lookup(name);

+-	up_read(&pwrdm_rwsem);

++	read_unlock_irqrestore(&pwrdm_rwlock, flags);

+ 

+ 	return pwrdm;

+ }

+@@ -204,7 +208,7 @@ struct powerdomain *pwrdm_lookup(const char *name)

+  *

+  * Call the supplied function for each registered powerdomain.  The

+  * callback function can return anything but 0 to bail out early from

+- * the iterator.  The callback function is called with the pwrdm_rwsem

++ * the iterator.  The callback function is called with the pwrdm_rwlock

+  * held for reading, so no powerdomain structure manipulation

+  * functions should be called from the callback, although hardware

+  * powerdomain control functions are fine.  Returns the last return

+@@ -215,18 +219,19 @@ struct powerdomain *pwrdm_lookup(const char *name)

+ int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm))

+ {

+ 	struct powerdomain *temp_pwrdm;

++	unsigned long flags;

+ 	int ret = 0;

+ 

+ 	if (!fn)

+ 		return -EINVAL;

+ 

+-	down_read(&pwrdm_rwsem);

++	read_lock_irqsave(&pwrdm_rwlock, flags);

+ 	list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {

+ 		ret = (*fn)(temp_pwrdm);

+ 		if (ret)

+ 			break;

+ 	}

+-	up_read(&pwrdm_rwsem);

++	read_unlock_irqrestore(&pwrdm_rwlock, flags);

+ 

+ 	return ret;

+ }

+@@ -243,6 +248,7 @@ int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm))

+  */

+ int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)

+ {

++	unsigned long flags;

+ 	int i;

+ 	int ret = -EINVAL;

+ 

+@@ -252,7 +258,7 @@ int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)

+ 	pr_debug("powerdomain: associating clockdomain %s with powerdomain "

+ 		 "%s\n", clkdm->name, pwrdm->name);

+ 

+-	down_write(&pwrdm_rwsem);

++	write_lock_irqsave(&pwrdm_rwlock, flags);

+ 

+ 	for (i = 0; i < PWRDM_MAX_CLKDMS; i++) {

+ 		if (!pwrdm->pwrdm_clkdms[i])

+@@ -278,7 +284,7 @@ int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)

+ 	ret = 0;

+ 

+ pac_exit:

+-	up_write(&pwrdm_rwsem);

++	write_unlock_irqrestore(&pwrdm_rwlock, flags);

+ 

+ 	return ret;

+ }

+@@ -295,6 +301,7 @@ pac_exit:

+  */

+ int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)

+ {

++	unsigned long flags;

+ 	int ret = -EINVAL;

+ 	int i;

+ 

+@@ -304,7 +311,7 @@ int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)

+ 	pr_debug("powerdomain: dissociating clockdomain %s from powerdomain "

+ 		 "%s\n", clkdm->name, pwrdm->name);

+ 

+-	down_write(&pwrdm_rwsem);

++	write_lock_irqsave(&pwrdm_rwlock, flags);

+ 

+ 	for (i = 0; i < PWRDM_MAX_CLKDMS; i++)

+ 		if (pwrdm->pwrdm_clkdms[i] == clkdm)

+@@ -322,7 +329,7 @@ int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)

+ 	ret = 0;

+ 

+ pdc_exit:

+-	up_write(&pwrdm_rwsem);

++	write_unlock_irqrestore(&pwrdm_rwlock, flags);

+ 

+ 	return ret;

+ }

+@@ -335,7 +342,7 @@ pdc_exit:

+  * Call the supplied function for each clockdomain in the powerdomain

+  * 'pwrdm'.  The callback function can return anything but 0 to bail

+  * out early from the iterator.  The callback function is called with

+- * the pwrdm_rwsem held for reading, so no powerdomain structure

++ * the pwrdm_rwlock held for reading, so no powerdomain structure

+  * manipulation functions should be called from the callback, although

+  * hardware powerdomain control functions are fine.  Returns -EINVAL

+  * if presented with invalid pointers; or passes along the last return

+@@ -346,18 +353,19 @@ int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,

+ 			 int (*fn)(struct powerdomain *pwrdm,

+ 				   struct clockdomain *clkdm))

+ {

++	unsigned long flags;

+ 	int ret = 0;

+ 	int i;

+ 

+ 	if (!fn)

+ 		return -EINVAL;

+ 

+-	down_read(&pwrdm_rwsem);

++	read_lock_irqsave(&pwrdm_rwlock, flags);

+ 

+ 	for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)

+ 		ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);

+ 

+-	up_read(&pwrdm_rwsem);

++	read_unlock_irqrestore(&pwrdm_rwlock, flags);

+ 

+ 	return ret;

+ }

+--

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