Mailing List Archive

# HG changeset patch
# User kaf24@firebug.cl.cam.ac.uk
# Node ID 801ffcaa450b4c16a6ab8ddd5d49617fcaa93e7f
# Parent 1fd8bd3591183c55d234c2588679358aec0109ba
This patch implements select() functionality on /dev/vtpm and fixes some
other problems.

Signed-off-by: Stefan Berger <stefanb@us.ibm.com>

diff -r 1fd8bd359118 -r 801ffcaa450b linux-2.6-xen-sparse/drivers/xen/tpmback/tpmback.c
--- a/linux-2.6-xen-sparse/drivers/xen/tpmback/tpmback.c Wed Oct 12 08:31:53 2005
+++ b/linux-2.6-xen-sparse/drivers/xen/tpmback/tpmback.c Wed Oct 12 08:33:03 2005
@@ -17,6 +17,7 @@
#include <linux/types.h>
#include <linux/list.h>
#include <linux/miscdevice.h>
+#include <linux/poll.h>
#include <asm/uaccess.h>
#include <asm-xen/xenbus.h>
#include <asm-xen/xen-public/grant_table.h>
@@ -680,9 +681,14 @@
}

static unsigned int
-vtpm_op_poll(struct file *file, struct poll_table_struct *pst)
-{
- return 0;
+vtpm_op_poll(struct file *file, struct poll_table_struct *pts)
+{
+ unsigned int flags = POLLOUT | POLLWRNORM;
+ poll_wait(file, &dataex.wait_queue, pts);
+ if (!list_empty(&dataex.pending_pak)) {
+ flags |= POLLIN | POLLRDNORM;
+ }
+ return flags;
}

static struct file_operations vtpm_ops = {
diff -r 1fd8bd359118 -r 801ffcaa450b linux-2.6-xen-sparse/drivers/xen/tpmfront/tpmfront.c
--- a/linux-2.6-xen-sparse/drivers/xen/tpmfront/tpmfront.c Wed Oct 12 08:31:53 2005
+++ b/linux-2.6-xen-sparse/drivers/xen/tpmfront/tpmfront.c Wed Oct 12 08:33:03 2005
@@ -39,6 +39,7 @@
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/tpmfe.h>
+#include <linux/err.h>

#include <asm/semaphore.h>
#include <asm/io.h>
@@ -372,7 +373,7 @@
info->watch.callback = watch_for_status;
err = register_xenbus_watch(&info->watch);
if (err) {
- message = "registering watch on backend";
+ xenbus_dev_error(dev, err, "registering watch on backend");
goto destroy_tpmring;
}

@@ -398,6 +399,8 @@
int err;
struct tpmfront_info *info;
int handle;
+ int len = max(XS_WATCH_PATH, XS_WATCH_TOKEN) + 1;
+ const char *vec[len];

err = xenbus_scanf(NULL, dev->nodename,
"handle", "%i", &handle);
@@ -426,6 +429,10 @@
dev->data = NULL;
return err;
}
+
+ vec[XS_WATCH_PATH] = info->watch.node;
+ vec[XS_WATCH_TOKEN] = NULL;
+ watch_for_status(&info->watch, vec, len);

return 0;
}

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