V4L/DVB (9778): cx18: cx18_writel_expect() should not declare success on a PCI read error

cx18: cx18_writel_expect() should not declare success on a PCI read error.
This removes the potential for cx18_write*_expect() calls to not
accomplish a PCI write successfully as expected.  The CX18-AV core uses the
*expect() calls often and this may be the source of intermittent audio
problems and standands switching problems.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/media/video/cx18/cx18-io.h b/drivers/media/video/cx18/cx18-io.h
index e6716dcb1e8b..2635b3a8cc96 100644
--- a/drivers/media/video/cx18/cx18-io.h
+++ b/drivers/media/video/cx18/cx18-io.h
@@ -83,10 +83,14 @@ void cx18_writel_expect(struct cx18 *cx, u32 val, void __iomem *addr,
                         u32 eval, u32 mask)
 {
         int i;
+        u32 r;
         eval &= mask;
         for (i = 0; i < CX18_MAX_MMIO_WR_RETRIES; i++) {
                 cx18_writel_noretry(cx, val, addr);
-                if (eval == (cx18_readl(cx, addr) & mask))
+                r = cx18_readl(cx, addr);
+                if (r == 0xffffffff && eval != 0xffffffff)
+                        continue;
+                if (eval == (r & mask))
                         break;
         }
 }