The defio subsystem overwrites the method fb_osp->mmap. That method is
stored in module's static data - and that means that if we have multiple
diplaylink adapters, they will over write each other's method.
In order to avoid interference between multiple adapters, we copy the
fb_ops structure to a device-local memory.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/video/fbdev/udlfb.c | 3 ++-
include/video/udlfb.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
Index: linux-4.17-rc7/drivers/video/fbdev/udlfb.c
===================================================================
--- linux-4.17-rc7.orig/drivers/video/fbdev/udlfb.c 2018-06-03 13:17:33.000000000 +0200
+++ linux-4.17-rc7/drivers/video/fbdev/udlfb.c 2018-06-03 13:17:33.000000000 +0200
@@ -1665,7 +1665,8 @@ static void dlfb_init_framebuffer_work(s
dlfb->info = info;
info->par = dlfb;
info->pseudo_palette = dlfb->pseudo_palette;
- info->fbops = &dlfb_ops;
+ dlfb->ops = dlfb_ops;
+ info->fbops = &dlfb->ops;
retval = fb_alloc_cmap(&info->cmap, 256, 0);
if (retval < 0) {
Index: linux-4.17-rc7/include/video/udlfb.h
===================================================================
--- linux-4.17-rc7.orig/include/video/udlfb.h 2018-06-03 13:17:33.000000000 +0200
+++ linux-4.17-rc7/include/video/udlfb.h 2018-06-03 13:17:33.000000000 +0200
@@ -51,6 +51,7 @@ struct dlfb_data {
int base8;
u32 pseudo_palette[256];
int blank_mode; /*one of FB_BLANK_ */
+ struct fb_ops ops;
/* blit-only rendering path metrics, exposed through sysfs */
atomic_t bytes_rendered; /* raw pixel-bytes driver asked to render */
atomic_t bytes_identical; /* saved effort with backbuffer comparison */
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