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staging: west bridge, addition of common lock on cyasdevice 

This patch adds and initializes a common lock to
cyasdevice module. This is meant to be used in order
to avoid error scenarios where the device module
could be called by both the block and gadget modules
at the same time.

Signed-off-by: David Cross <david.cross@cypress.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Cross 2010-10-05 18:48:08 -07:00 committed by Greg Kroah-Hartman
parent d11a5c6e68
commit 54930e8892
1 changed files with 18 additions and 0 deletions
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18
drivers/staging/westbridge/astoria/device/cyasdevice.c
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@ -48,6 +48,8 @@ typedef struct cyasdevice {
cy_as_device_handle dev_handle;
/* Handle to the HAL */
cy_as_hal_device_tag hal_tag;
spinlock_t common_lock;
unsigned long flags;
} cyasdevice;
/* global ptr to astoria device */
@ -126,6 +128,20 @@ static void cy_misc_callback(cy_as_device_handle h,
}
}
void cy_as_acquire_common_lock()
{
spin_lock_irqsave(&cy_as_device_controller->common_lock,
cy_as_device_controller->flags);
}
EXPORT_SYMBOL(cy_as_acquire_common_lock);
void cy_as_release_common_lock()
{
spin_unlock_irqrestore(&cy_as_device_controller->common_lock,
cy_as_device_controller->flags);
}
EXPORT_SYMBOL(cy_as_release_common_lock);
/* reset astoria and reinit all regs */
#define PNAND_REG_CFG_INIT_VAL 0x0000
void hal_reset(cy_as_hal_device_tag tag)
@ -331,6 +347,8 @@ static int cyasdevice_initialize(void)
((ver_data.is_debug_mode) ? "debug" : "release"),
ver_data.major, ver_data.minor, ver_data.build, str);
spin_lock_init(&cy_as_dev->common_lock);
/* done now */
cy_as_device_controller = cy_as_dev;