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-              rfac0ac7
+              r7c3fb9b
                 return EINVAL;
+        }
+        /* Note: some frame with previous physical address may slip to NIL here
+        /*
+         * Note: some frame with previous physical address may slip to NIL here
          * (for a moment the filtering is not exact), but ethernet should be OK with
          * that. Some frames may also be lost, but this is not a problem.

uspace/drv/nic/rtl8139/driver.c

-              rfac0ac7
+              r7c3fb9b
+}
+/* Reset receiver
+/*
+ * Reset receiver
+ *
  * Use in the case of receiver error (lost in the rx_buff)
 …
                 rx_offset = ALIGN_UP(rx_offset + size + RTL_FRAME_HEADER_SIZE, 4);
+                /* Write lesser value to prevent overflow into unread frame
+                /*
+                 * Write lesser value to prevent overflow into unread frame
                  * (the recomendation from the RealTech rtl8139 programming guide)
                  */
 …
+        }
+        /* Check transmittion interrupts first to allow transmit next frames
+        /*
+         * Check transmittion interrupts first to allow transmit next frames
          * sooner
          */
 …
                 rtl8139->int_mask = INT_TIME_OUT;
+                /* Force timer interrupt start be writing nonzero value to timer
+                /*
+                 * Force timer interrupt start be writing nonzero value to timer
                  * interrutp register (should be small to prevent big delay)
                  * Read TCTR to reset timer counter

-              rfac0ac7
+              r7c3fb9b
         size_t rem_size = data_size - to_src_end;
+        /* First copy the end part of the data (from the source begining),
+        /*
+         * First copy the end part of the data (from the source begining),
          * then copy the begining
          */

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