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[PATCH] tpm: add cancel function

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This patch provides the logic to check if an operation has been canceled while
waiting for the response to arrive.

Signed-off-by: Kylene Hall <kjhall@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Kylene Hall
2005-06-23 22:02:02 -07:00
committed by Linus Torvalds
parent 6659ca2ab6
commit d9e5b6bf9c
4 changed files with 23 additions and 12 deletions
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32
drivers/char/tpm/tpm.c
View File

@@ -141,7 +141,7 @@ EXPORT_SYMBOL_GPL(tpm_lpc_bus_init);
static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
size_t bufsiz)
{
ssize_t len;
ssize_t rc;
u32 count;
unsigned long stop;
@@ -157,10 +157,10 @@ static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
down(&chip->tpm_mutex);
if ((len = chip->vendor->send(chip, (u8 *) buf, count)) < 0) {
if ((rc = chip->vendor->send(chip, (u8 *) buf, count)) < 0) {
dev_err(&chip->pci_dev->dev,
"tpm_transmit: tpm_send: error %zd\n", len);
return len;
"tpm_transmit: tpm_send: error %zd\n", rc);
goto out;
}
stop = jiffies + 2 * 60 * HZ;
@@ -170,23 +170,31 @@ static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
chip->vendor->req_complete_val) {
goto out_recv;
}
msleep(TPM_TIMEOUT); /* CHECK */
if ((status == chip->vendor->req_canceled)) {
dev_err(&chip->pci_dev->dev, "Operation Canceled\n");
rc = -ECANCELED;
goto out;
}
msleep(TPM_TIMEOUT); /* CHECK */
rmb();
} while (time_before(jiffies, stop));
chip->vendor->cancel(chip);
dev_err(&chip->pci_dev->dev, "Time expired\n");
up(&chip->tpm_mutex);
return -EIO;
dev_err(&chip->pci_dev->dev, "Operation Timed out\n");
rc = -ETIME;
goto out;
out_recv:
len = chip->vendor->recv(chip, (u8 *) buf, bufsiz);
if (len < 0)
rc = chip->vendor->recv(chip, (u8 *) buf, bufsiz);
if (rc < 0)
dev_err(&chip->pci_dev->dev,
"tpm_transmit: tpm_recv: error %zd\n", len);
"tpm_transmit: tpm_recv: error %zd\n", rc);
out:
up(&chip->tpm_mutex);
return len;
return rc;
}
#define TPM_DIGEST_SIZE 20