Changeset eb212e7 in mainline for uspace/drv/bus/usb/ohci/hc.c

Timestamp:

2011-07-12T22:29:16Z (13 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

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

Children:

ca2815e

Parents:

fc6e607

Message:

OHCI: Mention consequences of removing dummy register access.

File:

• uspace/drv/bus/usb/ohci/hc.c (modified) (1 diff)

uspace/drv/bus/usb/ohci/hc.c

@@ -97 +97 @@
          * unless whole virtual addresses in irq is replaced
          * NOTE: Compiler won't remove this as ohci_regs_t members
-         * are declared volatile. */
+         * are declared volatile.
+         *
+         * Introducing CMD_MEM set of IRQ code commands broke
+         * assumption that IRQ code does not cause page faults.
+         * If this happens during idling (THREAD == NULL)
+         * it causes kernel panic.
+         */
         registers->revision;