Changeset 3fb14b0 in mainline for uspace/drv/bus/adb/cuda_adb/cuda_adb.c

Timestamp:

2019-05-07T11:50:49Z (6 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

1e8b633

Parents:

1fbe639b

Message:

Fix CUDA interrupt handling race.

It is necessary to clear SR_INT flag before processing the interrupt,
otherwise we can loose an interrupt.

File:

• uspace/drv/bus/adb/cuda_adb/cuda_adb.c (modified) (2 diffs)

uspace/drv/bus/adb/cuda_adb/cuda_adb.c

@@ -274 +274 @@
         fibril_mutex_lock(&cuda->dev_lock);
 
+        /* Lower IFR.SR_INT so that CUDA can generate next int by raising it. */
+        pio_write_8(&cuda->regs->ifr, SR_INT);
+
         switch (cuda->xstate) {
         case cx_listen:
@@ -293 +296 @@
         }
 
-        /* Lower IFR.SR_INT so that CUDA can generate next int by raising it. */
-        pio_write_8(&cuda->regs->ifr, SR_INT);
 
         fibril_mutex_unlock(&cuda->dev_lock);