From: Alan Cox <alan@linux.intel.com>
Date: Mon, 12 Oct 2009 14:38:17 +0000 (+0100)
Subject: Staging: et131x: Correct WRAP bit handling
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b9d2dde0556cde38105033cb39841658d81921d2;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

Staging: et131x: Correct WRAP bit handling

add_10bit loses the existing wrap value

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/staging/et131x/et1310_rx.c b/drivers/staging/et131x/et1310_rx.c
index 8f2e91fa0a86..10e21db57ac3 100644
--- a/drivers/staging/et131x/et1310_rx.c
+++ b/drivers/staging/et131x/et1310_rx.c
@@ -1177,12 +1177,20 @@ void et131x_handle_recv_interrupt(struct et131x_adapter *etdev)
 
 static inline u32 bump_fbr(u32 *fbr, u32 limit)
 {
-	u32 v = *fbr;
-	add_10bit(&v, 1);
-	if (v > limit)
-		v = (*fbr & ~ET_DMA10_MASK) ^ ET_DMA10_WRAP;
-	*fbr = v;
-	return v;
+        u32 v = *fbr;
+        v++;
+        /* This works for all cases where limit < 1024. The 1023 case
+           works because 1023++ is 1024 which means the if condition is not
+           taken but the carry of the bit into the wrap bit toggles the wrap
+           value correctly */
+        if ((v & ET_DMA10_MASK) > limit) {
+                v &= ~ET_DMA10_MASK;
+                v ^= ET_DMA10_WRAP;
+        }
+        /* For the 1023 case */
+        v &= (ET_DMA10_MASK|ET_DMA10_WRAP);
+        *fbr = v;
+        return v;
 }
 
 /**