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pcmcia: synclink_cs: fix error handling in mgslpc_probe()

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mgslpc_probe() ignores errors in mgslpc_add_device() and
does not release all resource if mgslpc_config() failed.

The patch adds returned code to mgslpc_add_device()
and fixes the both issues.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexey Khoroshilov 2013-02-07 01:00:34 +01:00 committed by Greg Kroah-Hartman
parent b95d788ac7
commit d34138d057
1 changed files with 41 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
drivers/char/pcmcia/synclink_cs.c
View File

@ -397,7 +397,7 @@ static int adapter_test(MGSLPC_INFO *info);
static int claim_resources(MGSLPC_INFO *info);
static void release_resources(MGSLPC_INFO *info);
static void mgslpc_add_device(MGSLPC_INFO *info);
static int mgslpc_add_device(MGSLPC_INFO *info);
static void mgslpc_remove_device(MGSLPC_INFO *info);
static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
@ -549,14 +549,21 @@ static int mgslpc_probe(struct pcmcia_device *link)
/* Initialize the struct pcmcia_device structure */
ret = mgslpc_config(link);
if (ret) {
tty_port_destroy(&info->port);
return ret;
}
if (ret != 0)
goto failed;
mgslpc_add_device(info);
ret = mgslpc_add_device(info);
if (ret != 0)
goto failed_release;
return 0;
failed_release:
mgslpc_release((u_long)link);
failed:
tty_port_destroy(&info->port);
kfree(info);
return ret;
}
/* Card has been inserted.
@ -2706,8 +2713,12 @@ static void release_resources(MGSLPC_INFO *info)
*
* Arguments: info pointer to device instance data
*/
static void mgslpc_add_device(MGSLPC_INFO *info)
static int mgslpc_add_device(MGSLPC_INFO *info)
{
MGSLPC_INFO *current_dev = NULL;
struct device *tty_dev;
int ret;
info->next_device = NULL;
info->line = mgslpc_device_count;
sprintf(info->device_name,"ttySLP%d",info->line);
@ -2722,7 +2733,7 @@ static void mgslpc_add_device(MGSLPC_INFO *info)
if (!mgslpc_device_list)
mgslpc_device_list = info;
else {
MGSLPC_INFO *current_dev = mgslpc_device_list;
current_dev = mgslpc_device_list;
while( current_dev->next_device )
current_dev = current_dev->next_device;
current_dev->next_device = info;
@ -2737,10 +2748,30 @@ static void mgslpc_add_device(MGSLPC_INFO *info)
info->device_name, info->io_base, info->irq_level);
#if SYNCLINK_GENERIC_HDLC
hdlcdev_init(info);
ret = hdlcdev_init(info);
if (ret != 0)
goto failed;
#endif
tty_port_register_device(&info->port, serial_driver, info->line,
tty_dev = tty_port_register_device(&info->port, serial_driver, info->line,
&info->p_dev->dev);
if (IS_ERR(tty_dev)) {
ret = PTR_ERR(tty_dev);
#if SYNCLINK_GENERIC_HDLC
hdlcdev_exit(info);
#endif
goto failed;
}
return 0;
failed:
if (current_dev)
current_dev->next_device = NULL;
else
mgslpc_device_list = NULL;
mgslpc_device_count--;
return ret;
}
static void mgslpc_remove_device(MGSLPC_INFO *remove_info)