/* * linux/drivers/video/console/fbcon_rotate.c -- Software Rotation * * Copyright (C) 2005 Antonino Daplas * * 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. */ #include #include #include #include #include #include #include #include "fbcon.h" #include "fbcon_rotate.h" static int fbcon_rotate_font(struct fb_info *info, struct vc_data *vc) { struct fbcon_ops *ops = info->fbcon_par; int len, err = 0; int s_cellsize, d_cellsize, i; const u8 *src; u8 *dst; if (vc->vc_font.data == ops->fontdata && ops->p->con_rotate == ops->cur_rotate) goto finished; src = ops->fontdata = vc->vc_font.data; ops->cur_rotate = ops->p->con_rotate; len = (!ops->p->userfont) ? 256 : FNTCHARCNT(src); s_cellsize = ((vc->vc_font.width + 7)/8) * vc->vc_font.height; d_cellsize = s_cellsize; if (ops->rotate == FB_ROTATE_CW || ops->rotate == FB_ROTATE_CCW) d_cellsize = ((vc->vc_font.height + 7)/8) * vc->vc_font.width; if (info->fbops->fb_sync) info->fbops->fb_sync(info); if (ops->fd_size < d_cellsize * len) { dst = kmalloc(d_cellsize * len, GFP_KERNEL); if (dst == NULL) { err = -ENOMEM; goto finished; } ops->fd_size = d_cellsize * len; kfree(ops->fontbuffer); ops->fontbuffer = dst; } dst = ops->fontbuffer; memset(dst, 0, ops->fd_size); switch (ops->rotate) { case FB_ROTATE_UD: for (i = len; i--; ) { rotate_ud(src, dst, vc->vc_font.width, vc->vc_font.height); src += s_cellsize; dst += d_cellsize; } break; case FB_ROTATE_CW: for (i = len; i--; ) { rotate_cw(src, dst, vc->vc_font.width, vc->vc_font.height); src += s_cellsize; dst += d_cellsize; } break; case FB_ROTATE_CCW: for (i = len; i--; ) { rotate_ccw(src, dst, vc->vc_font.width, vc->vc_font.height); src += s_cellsize; dst += d_cellsize; } break; } finished: return err; } void fbcon_set_rotate(struct fbcon_ops *ops) { ops->rotate_font = fbcon_rotate_font; switch(ops->rotate) { case FB_ROTATE_CW: fbcon_rotate_cw(ops); break; case FB_ROTATE_UD: fbcon_rotate_ud(ops); break; case FB_ROTATE_CCW: fbcon_rotate_ccw(ops); break; } } EXPORT_SYMBOL(fbcon_set_rotate); MODULE_AUTHOR("Antonino Daplas "); MODULE_DESCRIPTION("Console Rotation Support"); MODULE_LICENSE("GPL"); e='qt'>
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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 /sound/ppc/Makefile
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 'sound/ppc/Makefile')