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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-14 11:24:32 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-14 11:24:32 -0700 |
commit | afa49791caae70cc3fd665a182eea61250795265 (patch) | |
tree | 5a1683ad60a9c789802cfb2ac657981a6e43410e /drivers/video | |
parent | 22fe9446e82f1fe4b59900db4599061384efb0ad (diff) | |
parent | c590cece75728a85ea06801df3ebad2d7ad8612c (diff) | |
download | linux-3.10-afa49791caae70cc3fd665a182eea61250795265.tar.gz linux-3.10-afa49791caae70cc3fd665a182eea61250795265.tar.bz2 linux-3.10-afa49791caae70cc3fd665a182eea61250795265.zip |
Merge branch 'fbmem'
* fbmem:
Further fbcon sanity checking
fbmem: fix remove_conflicting_framebuffers races
Diffstat (limited to 'drivers/video')
-rw-r--r-- | drivers/video/fbmem.c | 123 |
1 files changed, 71 insertions, 52 deletions
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c index ea16e654a9b..5aac00eb183 100644 --- a/drivers/video/fbmem.c +++ b/drivers/video/fbmem.c @@ -1537,8 +1537,10 @@ static bool fb_do_apertures_overlap(struct apertures_struct *gena, return false; } +static int do_unregister_framebuffer(struct fb_info *fb_info); + #define VGA_FB_PHYS 0xA0000 -void remove_conflicting_framebuffers(struct apertures_struct *a, +static void do_remove_conflicting_framebuffers(struct apertures_struct *a, const char *name, bool primary) { int i; @@ -1560,39 +1562,26 @@ void remove_conflicting_framebuffers(struct apertures_struct *a, printk(KERN_INFO "fb: conflicting fb hw usage " "%s vs %s - removing generic driver\n", name, registered_fb[i]->fix.id); - unregister_framebuffer(registered_fb[i]); + do_unregister_framebuffer(registered_fb[i]); } } } -EXPORT_SYMBOL(remove_conflicting_framebuffers); - -/** - * register_framebuffer - registers a frame buffer device - * @fb_info: frame buffer info structure - * - * Registers a frame buffer device @fb_info. - * - * Returns negative errno on error, or zero for success. - * - */ -int -register_framebuffer(struct fb_info *fb_info) +static int do_register_framebuffer(struct fb_info *fb_info) { int i; struct fb_event event; struct fb_videomode mode; - if (num_registered_fb == FB_MAX) - return -ENXIO; - if (fb_check_foreignness(fb_info)) return -ENOSYS; - remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id, + do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id, fb_is_primary_device(fb_info)); - mutex_lock(®istration_lock); + if (num_registered_fb == FB_MAX) + return -ENXIO; + num_registered_fb++; for (i = 0 ; i < FB_MAX; i++) if (!registered_fb[i]) @@ -1635,7 +1624,6 @@ register_framebuffer(struct fb_info *fb_info) fb_var_to_videomode(&mode, &fb_info->var); fb_add_videomode(&mode, &fb_info->modelist); registered_fb[i] = fb_info; - mutex_unlock(®istration_lock); event.info = fb_info; if (!lock_fb_info(fb_info)) @@ -1645,37 +1633,14 @@ register_framebuffer(struct fb_info *fb_info) return 0; } - -/** - * unregister_framebuffer - releases a frame buffer device - * @fb_info: frame buffer info structure - * - * Unregisters a frame buffer device @fb_info. - * - * Returns negative errno on error, or zero for success. - * - * This function will also notify the framebuffer console - * to release the driver. - * - * This is meant to be called within a driver's module_exit() - * function. If this is called outside module_exit(), ensure - * that the driver implements fb_open() and fb_release() to - * check that no processes are using the device. - */ - -int -unregister_framebuffer(struct fb_info *fb_info) +static int do_unregister_framebuffer(struct fb_info *fb_info) { struct fb_event event; int i, ret = 0; - mutex_lock(®istration_lock); i = fb_info->node; - if (!registered_fb[i]) { - ret = -EINVAL; - goto done; - } - + if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) + return -EINVAL; if (!lock_fb_info(fb_info)) return -ENODEV; @@ -1683,10 +1648,8 @@ unregister_framebuffer(struct fb_info *fb_info) ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event); unlock_fb_info(fb_info); - if (ret) { - ret = -EINVAL; - goto done; - } + if (ret) + return -EINVAL; if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) @@ -1701,8 +1664,64 @@ unregister_framebuffer(struct fb_info *fb_info) /* this may free fb info */ put_fb_info(fb_info); -done: + return 0; +} + +void remove_conflicting_framebuffers(struct apertures_struct *a, + const char *name, bool primary) +{ + mutex_lock(®istration_lock); + do_remove_conflicting_framebuffers(a, name, primary); + mutex_unlock(®istration_lock); +} +EXPORT_SYMBOL(remove_conflicting_framebuffers); + +/** + * register_framebuffer - registers a frame buffer device + * @fb_info: frame buffer info structure + * + * Registers a frame buffer device @fb_info. + * + * Returns negative errno on error, or zero for success. + * + */ +int +register_framebuffer(struct fb_info *fb_info) +{ + int ret; + + mutex_lock(®istration_lock); + ret = do_register_framebuffer(fb_info); + mutex_unlock(®istration_lock); + + return ret; +} + +/** + * unregister_framebuffer - releases a frame buffer device + * @fb_info: frame buffer info structure + * + * Unregisters a frame buffer device @fb_info. + * + * Returns negative errno on error, or zero for success. + * + * This function will also notify the framebuffer console + * to release the driver. + * + * This is meant to be called within a driver's module_exit() + * function. If this is called outside module_exit(), ensure + * that the driver implements fb_open() and fb_release() to + * check that no processes are using the device. + */ +int +unregister_framebuffer(struct fb_info *fb_info) +{ + int ret; + + mutex_lock(®istration_lock); + ret = do_unregister_framebuffer(fb_info); mutex_unlock(®istration_lock); + return ret; } |