summaryrefslogtreecommitdiff
path: root/drivers/video
diff options
context:
space:
mode:
authorMikulas Patocka <mpatocka@redhat.com>2018-07-25 15:41:56 +0200
committerBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>2018-07-25 15:41:56 +0200
commit080fb5240bdcabed7387b814139c3ea172d59fc5 (patch)
treea35034f95902b71185318c8dd0c789d037be5719 /drivers/video
parentbb24153a3f13dd0dbc1f8055ad97fe346d598f66 (diff)
udlfb: handle allocation failure
Allocations larger than PAGE_ALLOC_COSTLY_ORDER are unreliable and they may fail anytime. This patch fixes the udlfb driver so that when a large alloactions fails, it tries to do multiple smaller allocations. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/fbdev/udlfb.c26
1 files changed, 17 insertions, 9 deletions
diff --git a/drivers/video/fbdev/udlfb.c b/drivers/video/fbdev/udlfb.c
index 770c1c8cfbd0..4ab903456129 100644
--- a/drivers/video/fbdev/udlfb.c
+++ b/drivers/video/fbdev/udlfb.c
@@ -1843,17 +1843,22 @@ static void dlfb_free_urb_list(struct dlfb_data *dlfb)
static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size)
{
- int i = 0;
struct urb *urb;
struct urb_node *unode;
char *buf;
+ size_t wanted_size = count * size;
spin_lock_init(&dlfb->urbs.lock);
+retry:
dlfb->urbs.size = size;
INIT_LIST_HEAD(&dlfb->urbs.list);
- while (i < count) {
+ sema_init(&dlfb->urbs.limit_sem, 0);
+ dlfb->urbs.count = 0;
+ dlfb->urbs.available = 0;
+
+ while (dlfb->urbs.count * size < wanted_size) {
unode = kzalloc(sizeof(*unode), GFP_KERNEL);
if (!unode)
break;
@@ -1866,11 +1871,16 @@ static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size)
}
unode->urb = urb;
- buf = usb_alloc_coherent(dlfb->udev, MAX_TRANSFER, GFP_KERNEL,
+ buf = usb_alloc_coherent(dlfb->udev, size, GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
kfree(unode);
usb_free_urb(urb);
+ if (size > PAGE_SIZE) {
+ size /= 2;
+ dlfb_free_urb_list(dlfb);
+ goto retry;
+ }
break;
}
@@ -1881,14 +1891,12 @@ static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size)
list_add_tail(&unode->entry, &dlfb->urbs.list);
- i++;
+ up(&dlfb->urbs.limit_sem);
+ dlfb->urbs.count++;
+ dlfb->urbs.available++;
}
- sema_init(&dlfb->urbs.limit_sem, i);
- dlfb->urbs.count = i;
- dlfb->urbs.available = i;
-
- return i;
+ return dlfb->urbs.count;
}
static struct urb *dlfb_get_urb(struct dlfb_data *dlfb)