#ifndef _UVESAFB_H
#define _UVESAFB_H

#include <uapi/video/uvesafb.h>


/* VBE CRTC Info Block */
struct vbe_crtc_ib {
	u16 horiz_total;
	u16 horiz_start;
	u16 horiz_end;
	u16 vert_total;
	u16 vert_start;
	u16 vert_end;
	u8  flags;
	u32 pixel_clock;
	u16 refresh_rate;
	u8  reserved[40];
} __attribute__ ((packed));

#define VBE_MODE_VGACOMPAT	0x20
#define VBE_MODE_COLOR		0x08
#define VBE_MODE_SUPPORTEDHW	0x01
#define VBE_MODE_GRAPHICS	0x10
#define VBE_MODE_LFB		0x80

#define VBE_MODE_MASK		(VBE_MODE_COLOR | VBE_MODE_SUPPORTEDHW | \
				VBE_MODE_GRAPHICS | VBE_MODE_LFB)

/* VBE Mode Info Block */
struct vbe_mode_ib {
	/* for all VBE revisions */
	u16 mode_attr;
	u8  winA_attr;
	u8  winB_attr;
	u16 win_granularity;
	u16 win_size;
	u16 winA_seg;
	u16 winB_seg;
	u32 win_func_ptr;
	u16 bytes_per_scan_line;

	/* for VBE 1.2+ */
	u16 x_res;
	u16 y_res;
	u8  x_char_size;
	u8  y_char_size;
	u8  planes;
	u8  bits_per_pixel;
	u8  banks;
	u8  memory_model;
	u8  bank_size;
	u8  image_pages;
	u8  reserved1;

	/* Direct color fields for direct/6 and YUV/7 memory models. */
	/* Offsets are bit positions of lsb in the mask. */
	u8  red_len;
	u8  red_off;
	u8  green_len;
	u8  green_off;
	u8  blue_len;
	u8  blue_off;
	u8  rsvd_len;
	u8  rsvd_off;
	u8  direct_color_info;	/* direct color mode attributes */

	/* for VBE 2.0+ */
	u32 phys_base_ptr;
	u8  reserved2[6];

	/* for VBE 3.0+ */
	u16 lin_bytes_per_scan_line;
	u8  bnk_image_pages;
	u8  lin_image_pages;
	u8  lin_red_len;
	u8  lin_red_off;
	u8  lin_green_len;
	u8  lin_green_off;
	u8  lin_blue_len;
	u8  lin_blue_off;
	u8  lin_rsvd_len;
	u8  lin_rsvd_off;
	u32 max_pixel_clock;
	u16 mode_id;
	u8  depth;
} __attribute__ ((packed));

#define UVESAFB_DEFAULT_MODE "640x480-16"

/* How long to wait for a reply from userspace [ms] */
#define UVESAFB_TIMEOUT 5000

/* Max number of concurrent tasks */
#define UVESAFB_TASKS_MAX 16

#define dac_reg	(0x3c8)
#define dac_val	(0x3c9)

struct uvesafb_pal_entry {
	u_char blue, green, red, pad;
} __attribute__ ((packed));

struct uvesafb_ktask {
	struct uvesafb_task t;
	void *buf;
	struct completion *done;
	u32 ack;
};

static int uvesafb_exec(struct uvesafb_ktask *tsk);

#define UVESAFB_EXACT_RES	1
#define UVESAFB_EXACT_DEPTH	2

struct uvesafb_par {
	struct vbe_ib vbe_ib;		/* VBE Info Block */
	struct vbe_mode_ib *vbe_modes;	/* list of supported VBE modes */
	int vbe_modes_cnt;

	u8 nocrtc;
	u8 ypan;			/* 0 - nothing, 1 - ypan, 2 - ywrap */
	u8 pmi_setpal;			/* PMI for palette changes */
	u16 *pmi_base;			/* protected mode interface location */
	void *pmi_start;
	void *pmi_pal;
	u8 *vbe_state_orig;		/*
					 * original hardware state, before the
					 * driver was loaded
					 */
	u8 *vbe_state_saved;		/* state saved by fb_save_state */
	int vbe_state_size;
	atomic_t ref_count;

	int mode_idx;
	struct vbe_crtc_ib crtc;
	int mtrr_handle;
};

#endif /* _UVESAFB_H */
lude</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/net?id=966d2b04e070bc040319aaebfec09e0144dc3341'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/net/addrconf.h?id=966d2b04e070bc040319aaebfec09e0144dc3341'>addrconf.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='966d2b04e070bc040319aaebfec09e0144dc3341'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Douglas Miller &lt;dougmill@linux.vnet.ibm.com&gt;</td><td class='right'>2017-01-28 06:42:20 -0600</td></tr>
<tr><th>committer</th><td>Tejun Heo &lt;tj@kernel.org&gt;</td><td class='right'>2017-01-28 07:49:42 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/addrconf.h?id=966d2b04e070bc040319aaebfec09e0144dc3341'>966d2b04e070bc040319aaebfec09e0144dc3341</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/net/addrconf.h?id=966d2b04e070bc040319aaebfec09e0144dc3341'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=966d2b04e070bc040319aaebfec09e0144dc3341'>4b96156e3d1dd4dfd6039b7c219c9dc4616da52d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/net/addrconf.h?id=966d2b04e070bc040319aaebfec09e0144dc3341'>include/net/addrconf.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/addrconf.h?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>1b1bc42c1692e9b62756323c675a44cb1a1f9dbd</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/net/addrconf.h?id=966d2b04e070bc040319aaebfec09e0144dc3341&amp;id2=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>diff</a>)</td></tr></table>
<div class='commit-subject'>percpu-refcount: fix reference leak during percpu-atomic transition</div><div class='commit-msg'>percpu_ref_tryget() and percpu_ref_tryget_live() should return
"true" IFF they acquire a reference. But the return value from
atomic_long_inc_not_zero() is a long and may have high bits set,
e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines
is bool so the reference may actually be acquired but the routines
return "false" which results in a reference leak since the caller
assumes it does not need to do a corresponding percpu_ref_put().

This was seen when performing CPU hotplug during I/O, as hangs in
blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start)
raced with percpu_ref_tryget (blk_mq_timeout_work).
Sample stack trace:

__switch_to+0x2c0/0x450
__schedule+0x2f8/0x970
schedule+0x48/0xc0
blk_mq_freeze_queue_wait+0x94/0x120
blk_mq_queue_reinit_work+0xb8/0x180
blk_mq_queue_reinit_prepare+0x84/0xa0
cpuhp_invoke_callback+0x17c/0x600
cpuhp_up_callbacks+0x58/0x150
_cpu_up+0xf0/0x1c0
do_cpu_up+0x120/0x150
cpu_subsys_online+0x64/0xe0
device_online+0xb4/0x120
online_store+0xb4/0xc0
dev_attr_store+0x68/0xa0
sysfs_kf_write+0x80/0xb0
kernfs_fop_write+0x17c/0x250
__vfs_write+0x6c/0x1e0
vfs_write+0xd0/0x270
SyS_write+0x6c/0x110
system_call+0x38/0xe0

Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS,
and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests.
However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0
and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set.

The fix is to make the tryget routines use an actual boolean internally instead
of the atomic long result truncated to a int.

Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints
Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751
Signed-off-by: Douglas Miller &lt;dougmill@linux.vnet.ibm.com&gt;
Reviewed-by: Jens Axboe &lt;axboe@fb.com&gt;
Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints")
Cc: stable@vger.kernel.org # v3.18+
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=966d2b04e070bc040319aaebfec09e0144dc3341'>Diffstat</a> (limited to 'include/net/addrconf.h')</div><table summary='diffstat' class='diffstat'>