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udlfb: introduce a rendering mutex 

Rendering calls may be done simultaneously from the workqueue,
dlfb_ops_write, dlfb_ops_ioctl, dlfb_ops_set_par and dlfb_dpy_deferred_io.
The code is robust enough so that it won't crash on concurrent rendering.

However, concurrent rendering may cause display corruption if the same
pixel is simultaneously being rendered. In order to avoid this corruption,
this patch adds a mutex around the rendering calls.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: Bernie Thompson <bernie@plugable.com>
Cc: Ladislav Michl <ladis@linux-mips.org>
Cc: <stable@vger.kernel.org>
[b.zolnierkie: replace "dlfb:" with "uldfb:" in the patch summary]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
This commit is contained in:
Mikulas Patocka 2019-04-01 17:46:57 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 6b11f9d843
commit babc250e27
2 changed files with 31 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/video/fbdev/udlfb.c
View File

@ -596,7 +596,7 @@ static int dlfb_render_hline(struct dlfb_data *dlfb, struct urb **urb_ptr,
static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y, int width, int height)
{
int i;
int i, ret;
char *cmd;
cycles_t start_cycles, end_cycles;
int bytes_sent = 0;
@ -606,21 +606,29 @@ static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y, int width, i
start_cycles = get_cycles();
mutex_lock(&dlfb->render_mutex);
aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
x = aligned_x;
if ((width <= 0) ||
(x + width > dlfb->info->var.xres) ||
(y + height > dlfb->info->var.yres))
return -EINVAL;
(y + height > dlfb->info->var.yres)) {
ret = -EINVAL;
goto unlock_ret;
}
if (!atomic_read(&dlfb->usb_active))
return 0;
if (!atomic_read(&dlfb->usb_active)) {
ret = 0;
goto unlock_ret;
}
urb = dlfb_get_urb(dlfb);
if (!urb)
return 0;
if (!urb) {
ret = 0;
goto unlock_ret;
}
cmd = urb->transfer_buffer;
for (i = y; i < y + height ; i++) {
@ -654,7 +662,11 @@ error:
>> 10)), /* Kcycles */
&dlfb->cpu_kcycles_used);
return 0;
ret = 0;
unlock_ret:
mutex_unlock(&dlfb->render_mutex);
return ret;
}
static void dlfb_init_damage(struct dlfb_data *dlfb)
@ -782,17 +794,19 @@ static void dlfb_dpy_deferred_io(struct fb_info *info,
int bytes_identical = 0;
int bytes_rendered = 0;
mutex_lock(&dlfb->render_mutex);
if (!fb_defio)
return;
goto unlock_ret;
if (!atomic_read(&dlfb->usb_active))
return;
goto unlock_ret;
start_cycles = get_cycles();
urb = dlfb_get_urb(dlfb);
if (!urb)
return;
goto unlock_ret;
cmd = urb->transfer_buffer;
@ -825,6 +839,8 @@ error:
atomic_add(((unsigned int) ((end_cycles - start_cycles)
>> 10)), /* Kcycles */
&dlfb->cpu_kcycles_used);
unlock_ret:
mutex_unlock(&dlfb->render_mutex);
}
static int dlfb_get_edid(struct dlfb_data *dlfb, char *edid, int len)
@ -986,6 +1002,8 @@ static void dlfb_ops_destroy(struct fb_info *info)
cancel_work_sync(&dlfb->damage_work);
mutex_destroy(&dlfb->render_mutex);
if (info->cmap.len != 0)
fb_dealloc_cmap(&info->cmap);
if (info->monspecs.modedb)
@ -1682,6 +1700,7 @@ static int dlfb_usb_probe(struct usb_interface *intf,
dlfb->ops = dlfb_ops;
info->fbops = &dlfb->ops;
mutex_init(&dlfb->render_mutex);
dlfb_init_damage(dlfb);
spin_lock_init(&dlfb->damage_lock);
INIT_WORK(&dlfb->damage_work, dlfb_damage_work);

1
include/video/udlfb.h
View File

@ -48,6 +48,7 @@ struct dlfb_data {
int base8;
u32 pseudo_palette[256];
int blank_mode; /*one of FB_BLANK_ */
struct mutex render_mutex;
int damage_x;
int damage_y;
int damage_x2;