[PATCH] tpm: fix error handling

- handle sysfs error
- handle driver model errors
- de-obfuscate platform_device_register_simple() call, which included an
  assignment in between two function calls, in the same C statement.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Acked-by: Kylene Hall <kjhall@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 17 insertions, 8 deletions

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index a082a2e34252..6ad2d3bb945c 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -1153,7 +1153,14 @@ struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vend
 
         spin_unlock(&driver_lock);
 
-        sysfs_create_group(&dev->kobj, chip->vendor.attr_group);
+        if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
+                list_del(&chip->list);
+                put_device(dev);
+                clear_bit(chip->dev_num, dev_mask);
+                kfree(chip);
+                kfree(devname);
+                return NULL;
+        }
 
         chip->bios_dir = tpm_bios_log_setup(devname);
 
diff --git a/drivers/char/tpm/tpm_atmel.c b/drivers/char/tpm/tpm_atmel.c
index ad8ffe49256f..1ab0896070be 100644
--- a/drivers/char/tpm/tpm_atmel.c
+++ b/drivers/char/tpm/tpm_atmel.c
@@ -184,7 +184,9 @@ static int __init init_atmel(void)
         unsigned long base;
         struct  tpm_chip *chip;
 
-        driver_register(&atml_drv);
+        rc = driver_register(&atml_drv);
+        if (rc)
+                return rc;
 
         if ((iobase = atmel_get_base_addr(&base, &region_size)) == NULL) {
                 rc = -ENODEV;
@@ -195,10 +197,8 @@ static int __init init_atmel(void)
             (atmel_request_region
              (tpm_atmel.base, region_size, "tpm_atmel0") == NULL) ? 0 : 1;
 
-
-        if (IS_ERR
-            (pdev =
-             platform_device_register_simple("tpm_atmel", -1, NULL, 0))) {
+        pdev = platform_device_register_simple("tpm_atmel", -1, NULL, 0);
+        if (IS_ERR(pdev)) {
                 rc = PTR_ERR(pdev);
                 goto err_rel_reg;
         }
diff --git a/drivers/char/tpm/tpm_nsc.c b/drivers/char/tpm/tpm_nsc.c
index 26287aace87d..608f73071bef 100644
--- a/drivers/char/tpm/tpm_nsc.c
+++ b/drivers/char/tpm/tpm_nsc.c
@@ -284,7 +284,7 @@ static struct device_driver nsc_drv = {
 static int __init init_nsc(void)
 {
         int rc = 0;
-        int lo, hi;
+        int lo, hi, err;
         int nscAddrBase = TPM_ADDR;
         struct tpm_chip *chip;
         unsigned long base;
@@ -297,7 +297,9 @@ static int __init init_nsc(void)
                         return -ENODEV;
         }
 
-        driver_register(&nsc_drv);
+        err = driver_register(&nsc_drv);
+        if (err)
+                return err;
 
         hi = tpm_read_index(nscAddrBase, TPM_NSC_BASE0_HI);
         lo = tpm_read_index(nscAddrBase, TPM_NSC_BASE0_LO);