diff options
| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2013-02-07 01:00:34 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-02-08 12:21:19 -0800 |
| commit | d34138d057628211b1c835e13a64d0cc2423c969 (patch) | |
| tree | df6748f0f35437ceb4e3d0fdd49e8f6db2957cb4 /drivers/char | |
| parent | b95d788ac72b86515842a4eb92bb58a8da76a975 (diff) | |
| download | lwn-d34138d057628211b1c835e13a64d0cc2423c969.tar.gz lwn-d34138d057628211b1c835e13a64d0cc2423c969.zip | |
pcmcia: synclink_cs: fix error handling in mgslpc_probe()
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>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/pcmcia/synclink_cs.c | 51 |
1 files changed, 41 insertions, 10 deletions
diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c index b66eaa04f8cb..56e4e940fa19 100644 --- a/drivers/char/pcmcia/synclink_cs.c +++ b/drivers/char/pcmcia/synclink_cs.c @@ -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) |