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author | Arnd Bergmann <arnd@arndb.de> | 2014-04-24 23:46:58 +0200 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2014-04-24 23:46:58 +0200 |
commit | 1fc52762e33cc905331681364d79424d921f60f2 (patch) | |
tree | d7347407cbbdb7a0565e3b4d09aaf40f0705491a /drivers/video/fbdev/core/fb_sys_fops.c | |
parent | 9ef1af9ea28c23d0eaed97f7f5142788b6cf570a (diff) | |
parent | cf2e0a73ca9ad376825c013ebaa145608abc27d7 (diff) | |
download | linux-1fc52762e33cc905331681364d79424d921f60f2.tar.bz2 |
Merge tag 'vexpress/fixes-for-3.15' of git://git.linaro.org/people/pawel.moll/linux into fixes
ARM Versatile Express fixes for 3.15
This series contains straight-forward fixes for different
Versatile Express infrastructure drivers:
- NULL pointer dereference on the error path in the clk driver
- out of boundary array access in the dcscb driver
- broken restart/power off implementation
- mis-interpreted voltage unit in the spc driver
* tag 'vexpress/fixes-for-3.15' of git://git.linaro.org/people/pawel.moll/linux:
ARM: vexpress/TC2: Convert OPP voltage to uV before storing
power/reset: vexpress: Fix restart/power off operation
arm/mach-vexpress: array accessed out of bounds
clk: vexpress: NULL dereference on error path
Includes an update to 3.15-rc2
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/video/fbdev/core/fb_sys_fops.c')
-rw-r--r-- | drivers/video/fbdev/core/fb_sys_fops.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/drivers/video/fbdev/core/fb_sys_fops.c b/drivers/video/fbdev/core/fb_sys_fops.c new file mode 100644 index 000000000000..ff275d7f3eaf --- /dev/null +++ b/drivers/video/fbdev/core/fb_sys_fops.c @@ -0,0 +1,104 @@ +/* + * linux/drivers/video/fb_sys_read.c - Generic file operations where + * framebuffer is in system RAM + * + * Copyright (C) 2007 Antonino Daplas <adaplas@pol.net> + * + * 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 <linux/fb.h> +#include <linux/module.h> +#include <linux/uaccess.h> + +ssize_t fb_sys_read(struct fb_info *info, char __user *buf, size_t count, + loff_t *ppos) +{ + unsigned long p = *ppos; + void *src; + int err = 0; + unsigned long total_size; + + if (info->state != FBINFO_STATE_RUNNING) + return -EPERM; + + total_size = info->screen_size; + + if (total_size == 0) + total_size = info->fix.smem_len; + + if (p >= total_size) + return 0; + + if (count >= total_size) + count = total_size; + + if (count + p > total_size) + count = total_size - p; + + src = (void __force *)(info->screen_base + p); + + if (info->fbops->fb_sync) + info->fbops->fb_sync(info); + + if (copy_to_user(buf, src, count)) + err = -EFAULT; + + if (!err) + *ppos += count; + + return (err) ? err : count; +} +EXPORT_SYMBOL_GPL(fb_sys_read); + +ssize_t fb_sys_write(struct fb_info *info, const char __user *buf, + size_t count, loff_t *ppos) +{ + unsigned long p = *ppos; + void *dst; + int err = 0; + unsigned long total_size; + + if (info->state != FBINFO_STATE_RUNNING) + return -EPERM; + + total_size = info->screen_size; + + if (total_size == 0) + total_size = info->fix.smem_len; + + if (p > total_size) + return -EFBIG; + + if (count > total_size) { + err = -EFBIG; + count = total_size; + } + + if (count + p > total_size) { + if (!err) + err = -ENOSPC; + + count = total_size - p; + } + + dst = (void __force *) (info->screen_base + p); + + if (info->fbops->fb_sync) + info->fbops->fb_sync(info); + + if (copy_from_user(dst, buf, count)) + err = -EFAULT; + + if (!err) + *ppos += count; + + return (err) ? err : count; +} +EXPORT_SYMBOL_GPL(fb_sys_write); + +MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>"); +MODULE_DESCRIPTION("Generic file read (fb in system RAM)"); +MODULE_LICENSE("GPL"); |