lkml.org 
[lkml]   [2012]   [Aug]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 09/41] misc: pti, fix fail paths
Date
Fail paths in ->probe and pti_init are incomplete. Fix that by adding
proper clean-up paths.

Note that we used to leak tty_driver on module unload. This is fixed
here too.

tty_unregister_driver needs not retval checking, so remove that.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: J Freyensee <james_p_freyensee@linux.intel.com>
---
drivers/misc/pti.c | 53 +++++++++++++++++++++++++---------------------------
1 file changed, 25 insertions(+), 28 deletions(-)

diff --git a/drivers/misc/pti.c b/drivers/misc/pti.c
index be6e679..90de855 100644
--- a/drivers/misc/pti.c
+++ b/drivers/misc/pti.c
@@ -811,7 +811,7 @@ static int __devinit pti_pci_probe(struct pci_dev *pdev,
__func__, __LINE__);
pr_err("%s(%d): Error value returned: %d\n",
__func__, __LINE__, retval);
- return retval;
+ goto err;
}

retval = pci_enable_device(pdev);
@@ -819,17 +819,16 @@ static int __devinit pti_pci_probe(struct pci_dev *pdev,
dev_err(&pdev->dev,
"%s: pci_enable_device() returned error %d\n",
__func__, retval);
- return retval;
+ goto err_unreg_misc;
}

drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
-
if (drv_data == NULL) {
retval = -ENOMEM;
dev_err(&pdev->dev,
"%s(%d): kmalloc() returned NULL memory.\n",
__func__, __LINE__);
- return retval;
+ goto err_disable_pci;
}
drv_data->pti_addr = pci_resource_start(pdev, pci_bar);

@@ -838,18 +837,15 @@ static int __devinit pti_pci_probe(struct pci_dev *pdev,
dev_err(&pdev->dev,
"%s(%d): pci_request_region() returned error %d\n",
__func__, __LINE__, retval);
- kfree(drv_data);
- return retval;
+ goto err_free_dd;
}
drv_data->aperture_base = drv_data->pti_addr+APERTURE_14;
drv_data->pti_ioaddr =
ioremap_nocache((u32)drv_data->aperture_base,
APERTURE_LEN);
if (!drv_data->pti_ioaddr) {
- pci_release_region(pdev, pci_bar);
retval = -ENOMEM;
- kfree(drv_data);
- return retval;
+ goto err_rel_reg;
}

pci_set_drvdata(pdev, drv_data);
@@ -862,6 +858,16 @@ static int __devinit pti_pci_probe(struct pci_dev *pdev,

register_console(&pti_console);

+ return 0;
+err_rel_reg:
+ pci_release_region(pdev, pci_bar);
+err_free_dd:
+ kfree(drv_data);
+err_disable_pci:
+ pci_disable_device(pdev);
+err_unreg_misc:
+ misc_deregister(&pti_char_driver);
+err:
return retval;
}

@@ -937,25 +943,24 @@ static int __init pti_init(void)
pr_err("%s(%d): Error value returned: %d\n",
__func__, __LINE__, retval);

- pti_tty_driver = NULL;
- return retval;
+ goto put_tty;
}

retval = pci_register_driver(&pti_pci_driver);
-
if (retval) {
pr_err("%s(%d): PCI registration failed of pti driver\n",
__func__, __LINE__);
pr_err("%s(%d): Error value returned: %d\n",
__func__, __LINE__, retval);
-
- tty_unregister_driver(pti_tty_driver);
- pr_err("%s(%d): Unregistering TTY part of pti driver\n",
- __func__, __LINE__);
- pti_tty_driver = NULL;
- return retval;
+ goto unreg_tty;
}

+ return 0;
+unreg_tty:
+ tty_unregister_driver(pti_tty_driver);
+put_tty:
+ put_tty_driver(pti_tty_driver);
+ pti_tty_driver = NULL;
return retval;
}

@@ -964,17 +969,9 @@ static int __init pti_init(void)
*/
static void __exit pti_exit(void)
{
- int retval;
-
- retval = tty_unregister_driver(pti_tty_driver);
- if (retval) {
- pr_err("%s(%d): TTY unregistration failed of pti driver\n",
- __func__, __LINE__);
- pr_err("%s(%d): Error value returned: %d\n",
- __func__, __LINE__, retval);
- }
-
+ tty_unregister_driver(pti_tty_driver);
pci_unregister_driver(&pti_pci_driver);
+ put_tty_driver(pti_tty_driver);
}

module_init(pti_init);
--
1.7.10.4



\
 
 \ /
  Last update: 2012-08-07 23:01    [W:0.231 / U:33.408 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site