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fbdev: sh_mobile_hdmi: implement locking

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The SH-Mobile HDMI driver runs in several contexts: ISR, delayed work-queue,
task context, when called from the sh_mobile_lcdc framebuffer driver. This
creates ample race possibilities. Even though most these races are purely
theoretical, it is better to close them. To trace fb_info validity we install a
notification callback in the HDMI driver, and the only way for it to get to
driver internal data is by using struct sh_mobile_lcdc_chan, therefore it had
to be extracted into a separate common header.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Guennadi Liakhovetski
2010-09-03 07:20:23 +00:00
committed by Paul Mundt
parent 89712699d7
commit 6de9edd5bd
4 changed files with 141 additions and 47 deletions
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2
include/video/sh_mobile_lcdc.h
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@@ -49,7 +49,9 @@ struct sh_mobile_lcdc_sys_bus_ops {
unsigned long (*read_data)(void *handle);
};
struct module;
struct sh_mobile_lcdc_board_cfg {
struct module *owner;
void *board_data;
int (*setup_sys)(void *board_data, void *sys_ops_handle,
struct sh_mobile_lcdc_sys_bus_ops *sys_ops);