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udlfb: make a local copy of fb_ops 

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@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
This commit is contained in:
Mikulas Patocka 2018-07-25 15:41:55 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 564f180737
commit 2c29cfc3ea
2 changed files with 3 additions and 1 deletions
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3
drivers/video/fbdev/udlfb.c
View File

@ -1665,7 +1665,8 @@ static void dlfb_init_framebuffer_work(struct work_struct *work)
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) {

1
include/video/udlfb.h
View File

@ -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 */