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authorMauro Carvalho Chehab <mchehab@infradead.org>2007-01-14 10:14:17 -0200
committerMauro Carvalho Chehab <mchehab@infradead.org>2007-01-15 16:25:28 -0200
commit35d6270b806562b37279d3970fa477aaeb372829 (patch)
tree745d97e7fdb2d650c4bb9167a3f53e0249e1a8a4 /drivers/media
parentc430ca1e16b2b4b30f567806c73e270caea8db1d (diff)
V4L/DVB (5020): Fix: disable interrupts while at KM_BOUNCE_READ
vivi.c uses the KM_BOUNCE_READ with local interrupts enabled. This means that if a disk interrupt occurs while vivi.c is using this fixmap slot, the vivi.c driver will, upon return from that interrupt, find that the fixmap slot now points at a different physical page. The net result will probably be rare corruption of disk file contents, because viv.c will now be altering the page which the disk code was recently using. Thanks to Andrew Morton for pointing this. Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/video/vivi.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index bacb311b4f2..d4cf5566673 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -270,10 +270,15 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
char *p,*s,*basep;
struct page *pg;
u8 chr,r,g,b,color;
+ unsigned long flags;
+ spinlock_t spinlock;
+
+ spin_lock_init(&spinlock);
/* Get first addr pointed to pixel position */
oldpg=get_addr_pos(pos,pages,to_addr);
pg=pfn_to_page(sg_dma_address(to_addr[oldpg].sg) >> PAGE_SHIFT);
+ spin_lock_irqsave(&spinlock,flags);
basep = kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[oldpg].sg->offset;
/* We will just duplicate the second pixel at the packet */
@@ -376,6 +381,8 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
end:
kunmap_atomic(basep, KM_BOUNCE_READ);
+ spin_unlock_irqrestore(&spinlock,flags);
+
}
static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
{