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authorRajiv Andrade <srajiv@linux.vnet.ibm.com>2011-09-16 14:39:40 -0300
committerRajiv Andrade <srajiv@linux.vnet.ibm.com>2011-11-16 09:44:55 -0200
commitfd04886660208ab2e35baaca55588afa57d52c9c (patch)
tree200fd2b5a472317472f36cd452f60b1e5b42874f /drivers/char/tpm/tpm.c
parent9efa54f002cc03fdb4e9d8d508aa996af01c48d0 (diff)
TPM: Export wait_for_stat for other vendor specific drivers
Moved wait_for_stat to tpm.c so that other drivers can use it. Also renamed it to avoid future namespace conflicts. Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Diffstat (limited to 'drivers/char/tpm/tpm.c')
-rw-r--r--drivers/char/tpm/tpm.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 2e12b3f98139..efd24bbb5cb1 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
+#include <linux/freezer.h>
#include "tpm.h"
@@ -1057,6 +1058,46 @@ ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
}
EXPORT_SYMBOL_GPL(tpm_store_cancel);
+int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
+ wait_queue_head_t *queue)
+{
+ unsigned long stop;
+ long rc;
+ u8 status;
+
+ /* check current status */
+ status = chip->vendor.status(chip);
+ if ((status & mask) == mask)
+ return 0;
+
+ stop = jiffies + timeout;
+
+ if (chip->vendor.irq) {
+again:
+ timeout = stop - jiffies;
+ if ((long)timeout <= 0)
+ return -ETIME;
+ rc = wait_event_interruptible_timeout(*queue,
+ ((chip->vendor.status(chip)
+ & mask) == mask),
+ timeout);
+ if (rc > 0)
+ return 0;
+ if (rc == -ERESTARTSYS && freezing(current)) {
+ clear_thread_flag(TIF_SIGPENDING);
+ goto again;
+ }
+ } else {
+ do {
+ msleep(TPM_TIMEOUT);
+ status = chip->vendor.status(chip);
+ if ((status & mask) == mask)
+ return 0;
+ } while (time_before(jiffies, stop));
+ }
+ return -ETIME;
+}
+EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
/*
* Device file system interface to the TPM
*