tpm: vtpm_proxy: conditionally call tpm_chip_unregister
If tpm_chip_register fails vtpm must not call tpm_chip_unregister:
> [ 58.271017] [<ffffffff8155bd32>] dpm_sysfs_remove+0x22/0x60
> [ 58.271017] [<ffffffff8154e438>] device_del+0x58/0x280
> [ 58.271017] [<ffffffffa024c020>] tpm_chip_unregister+0x40/0xb0 [tpm]
> [ 58.271017] [<ffffffffa0292360>] vtpm_proxy_fops_release+0x40/0x60 [tpm_vtpm_proxy]
[jarkko.sakkinen@linux.intel.com: cleaned up unneeded goto away]
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c
index 3d6f6ca..5463b58 100644
--- a/drivers/char/tpm/tpm_vtpm_proxy.c
+++ b/drivers/char/tpm/tpm_vtpm_proxy.c
@@ -42,6 +42,7 @@ struct proxy_dev {
long state; /* internal state */
#define STATE_OPENED_FLAG BIT(0)
#define STATE_WAIT_RESPONSE_FLAG BIT(1) /* waiting for emulator response */
+#define STATE_REGISTERED_FLAG BIT(2)
size_t req_len; /* length of queued TPM request */
size_t resp_len; /* length of queued TPM response */
@@ -370,12 +371,9 @@ static void vtpm_proxy_work(struct work_struct *work)
rc = tpm_chip_register(proxy_dev->chip);
if (rc)
- goto err;
-
- return;
-
-err:
- vtpm_proxy_fops_undo_open(proxy_dev);
+ vtpm_proxy_fops_undo_open(proxy_dev);
+ else
+ proxy_dev->state |= STATE_REGISTERED_FLAG;
}
/*
@@ -516,7 +514,8 @@ static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev)
*/
vtpm_proxy_fops_undo_open(proxy_dev);
- tpm_chip_unregister(proxy_dev->chip);
+ if (proxy_dev->state & STATE_REGISTERED_FLAG)
+ tpm_chip_unregister(proxy_dev->chip);
vtpm_proxy_delete_proxy_dev(proxy_dev);
}
