/* * linux/include/video/pmagb-b-fb.h * * TURBOchannel PMAGB-B Smart Frame Buffer (SFB) card support, * Copyright (C) 1999, 2000, 2001 by * Michael Engel and * Karsten Merker * Copyright (c) 2005 Maciej W. Rozycki * * This file is subject to the terms and conditions of the GNU General * Public License. See the file COPYING in the main directory of this * archive for more details. */ /* IOmem resource offsets. */ #define PMAGB_B_ROM 0x000000 /* REX option ROM */ #define PMAGB_B_SFB 0x100000 /* SFB ASIC */ #define PMAGB_B_GP0 0x140000 /* general purpose output 0 */ #define PMAGB_B_GP1 0x180000 /* general purpose output 1 */ #define PMAGB_B_BT459 0x1c0000 /* Bt459 RAMDAC */ #define PMAGB_B_FBMEM 0x200000 /* frame buffer */ #define PMAGB_B_SIZE 0x400000 /* address space size */ /* IOmem register offsets. */ #define SFB_REG_VID_HOR 0x64 /* video horizontal setup */ #define SFB_REG_VID_VER 0x68 /* video vertical setup */ #define SFB_REG_VID_BASE 0x6c /* video base address */ #define SFB_REG_TCCLK_COUNT 0x78 /* TURBOchannel clock count */ #define SFB_REG_VIDCLK_COUNT 0x7c /* video clock count */ /* Video horizontal setup register constants. All bits are r/w. */ #define SFB_VID_HOR_BP_SHIFT 0x15 /* back porch */ #define SFB_VID_HOR_BP_MASK 0x7f #define SFB_VID_HOR_SYN_SHIFT 0x0e /* sync pulse */ #define SFB_VID_HOR_SYN_MASK 0x7f #define SFB_VID_HOR_FP_SHIFT 0x09 /* front porch */ #define SFB_VID_HOR_FP_MASK 0x1f #define SFB_VID_HOR_PIX_SHIFT 0x00 /* active video */ #define SFB_VID_HOR_PIX_MASK 0x1ff /* Video vertical setup register constants. All bits are r/w. */ #define SFB_VID_VER_BP_SHIFT 0x16 /* back porch */ #define SFB_VID_VER_BP_MASK 0x3f #define SFB_VID_VER_SYN_SHIFT 0x10 /* sync pulse */ #define SFB_VID_VER_SYN_MASK 0x3f #define SFB_VID_VER_FP_SHIFT 0x0b /* front porch */ #define SFB_VID_VER_FP_MASK 0x1f #define SFB_VID_VER_SL_SHIFT 0x00 /* active scan lines */ #define SFB_VID_VER_SL_MASK 0x7ff /* Video base address register constants. All bits are r/w. */ #define SFB_VID_BASE_MASK 0x1ff /* video base row address */ /* Bt459 register offsets, byte-wide registers. */ #define BT459_ADDR_LO 0x0 /* address low */ #define BT459_ADDR_HI 0x4 /* address high */ #define BT459_DATA 0x8 /* data window register */ #define BT459_CMAP 0xc /* color map window register */ /linux/net-next.git/log/include/drm/drm_edid.h'>
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authorDouglas Miller <dougmill@linux.vnet.ibm.com>2017-01-28 06:42:20 -0600
committerTejun Heo <tj@kernel.org>2017-01-28 07:49:42 -0500
commit966d2b04e070bc040319aaebfec09e0144dc3341 (patch)
tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /include/drm/drm_edid.h
parent1b1bc42c1692e9b62756323c675a44cb1a1f9dbd (diff)
percpu-refcount: fix reference leak during percpu-atomic transition
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 <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'include/drm/drm_edid.h')