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Revision 02f9f5e62a9b0a1af2edd4fbd8194c9c5475459b authored by Imre Deak on 12 February 2016, 16:55:17 UTC, committed by Jani Nikula on 22 February 2016, 15:44:38 UTC 
drm/i915: Ensure the HW is powered when accessing the CRC HW block
 
The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

While at it also add the missing reference around the HW access in
i915_interrupt_info().

v2:
- update the commit message mentioning that this also fixes the
  HW access in the interrupt info debugfs entry (Daniel)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-9-git-send-email-imre.deak@intel.com
(cherry picked from commit e129649b7a3e1d50d196e159492496777769437e)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
1 parent d594102
Raw File
do_mounts.h 
#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/init.h>
#include <linux/syscalls.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/mount.h>
#include <linux/major.h>
#include <linux/root_dev.h>

void  change_floppy(char *fmt, ...);
void  mount_block_root(char *name, int flags);
void  mount_root(void);
extern int root_mountflags;

static inline int create_dev(char *name, dev_t dev)
{
	sys_unlink(name);
	return sys_mknod(name, S_IFBLK|0600, new_encode_dev(dev));
}

#if BITS_PER_LONG == 32
static inline u32 bstat(char *name)
{
	struct stat64 stat;
	if (sys_stat64(name, &stat) != 0)
		return 0;
	if (!S_ISBLK(stat.st_mode))
		return 0;
	if (stat.st_rdev != (u32)stat.st_rdev)
		return 0;
	return stat.st_rdev;
}
#else
static inline u32 bstat(char *name)
{
	struct stat stat;
	if (sys_newstat(name, &stat) != 0)
		return 0;
	if (!S_ISBLK(stat.st_mode))
		return 0;
	return stat.st_rdev;
}
#endif

#ifdef CONFIG_BLK_DEV_RAM

int __init rd_load_disk(int n);
int __init rd_load_image(char *from);

#else

static inline int rd_load_disk(int n) { return 0; }
static inline int rd_load_image(char *from) { return 0; }

#endif

#ifdef CONFIG_BLK_DEV_INITRD

bool __init initrd_load(void);

#else

static inline bool initrd_load(void) { return false; }

#endif

#ifdef CONFIG_BLK_DEV_MD

void md_run_setup(void);

#else

static inline void md_run_setup(void) {}

#endif
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