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authorAlexey Khoroshilov <khoroshilov@ispras.ru>2013-02-17 02:24:37 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-02-18 11:05:14 -0800
commit9e17df37d710f8998e9cb10a548304fe33d4a5c2 (patch)
tree67e3c53b0015d37f23b76c8f661342b8ea504b26
parentf30e826069918da0876493e2de9ba13287b68e0a (diff)
tty: mxser: improve error handling in mxser_probe() and mxser_module_init()
1. Currently mxser_probe() and mxser_module_init() ignore errors that can happen in tty_port_register_device(). 2. mxser_module_init() does not deallocate resources allocated in mxser_get_ISA_conf() if mxser_initbrd() failed. The patch adds proper error handling in all the cases. Also it moves free_irq() from mxser_release_ISA_res() to mxser_board_remove(), since it makes mxser_release_ISA_res() a counterpart for mxser_get_ISA_conf(), while free_irq() is relevant to both ISA and PCI boards. 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>
-rw-r--r--drivers/tty/mxser.c42
1 files changed, 35 insertions, 7 deletions
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index ad34a20..484b6a3 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -2364,7 +2364,6 @@ static void mxser_release_vector(struct mxser_board *brd)
static void mxser_release_ISA_res(struct mxser_board *brd)
{
- free_irq(brd->irq, brd);
release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
mxser_release_vector(brd);
}
@@ -2430,6 +2429,7 @@ static void mxser_board_remove(struct mxser_board *brd)
tty_unregister_device(mxvar_sdriver, brd->idx + i);
tty_port_destroy(&brd->ports[i].port);
}
+ free_irq(brd->irq, brd);
}
static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
@@ -2554,6 +2554,7 @@ static int mxser_probe(struct pci_dev *pdev,
struct mxser_board *brd;
unsigned int i, j;
unsigned long ioaddress;
+ struct device *tty_dev;
int retval = -EINVAL;
for (i = 0; i < MXSER_BOARDS; i++)
@@ -2637,13 +2638,25 @@ static int mxser_probe(struct pci_dev *pdev,
if (retval)
goto err_rel3;
- for (i = 0; i < brd->info->nports; i++)
- tty_port_register_device(&brd->ports[i].port, mxvar_sdriver,
- brd->idx + i, &pdev->dev);
+ for (i = 0; i < brd->info->nports; i++) {
+ tty_dev = tty_port_register_device(&brd->ports[i].port,
+ mxvar_sdriver, brd->idx + i, &pdev->dev);
+ if (IS_ERR(tty_dev)) {
+ retval = PTR_ERR(tty_dev);
+ for (i--; i >= 0; i--)
+ tty_unregister_device(mxvar_sdriver,
+ brd->idx + i);
+ goto err_relbrd;
+ }
+ }
pci_set_drvdata(pdev, brd);
return 0;
+err_relbrd:
+ for (i = 0; i < brd->info->nports; i++)
+ tty_port_destroy(&brd->ports[i].port);
+ free_irq(brd->irq, brd);
err_rel3:
pci_release_region(pdev, 3);
err_zero:
@@ -2665,7 +2678,6 @@ static void mxser_remove(struct pci_dev *pdev)
mxser_board_remove(brd);
- free_irq(pdev->irq, brd);
pci_release_region(pdev, 2);
pci_release_region(pdev, 3);
pci_disable_device(pdev);
@@ -2683,6 +2695,7 @@ static struct pci_driver mxser_driver = {
static int __init mxser_module_init(void)
{
struct mxser_board *brd;
+ struct device *tty_dev;
unsigned int b, i, m;
int retval;
@@ -2728,14 +2741,29 @@ static int __init mxser_module_init(void)
/* mxser_initbrd will hook ISR. */
if (mxser_initbrd(brd, NULL) < 0) {
+ mxser_release_ISA_res(brd);
brd->info = NULL;
continue;
}
brd->idx = m * MXSER_PORTS_PER_BOARD;
- for (i = 0; i < brd->info->nports; i++)
- tty_port_register_device(&brd->ports[i].port,
+ for (i = 0; i < brd->info->nports; i++) {
+ tty_dev = tty_port_register_device(&brd->ports[i].port,
mxvar_sdriver, brd->idx + i, NULL);
+ if (IS_ERR(tty_dev)) {
+ for (i--; i >= 0; i--)
+ tty_unregister_device(mxvar_sdriver,
+ brd->idx + i);
+ for (i = 0; i < brd->info->nports; i++)
+ tty_port_destroy(&brd->ports[i].port);
+ free_irq(brd->irq, brd);
+ mxser_release_ISA_res(brd);
+ brd->info = NULL;
+ break;
+ }
+ }
+ if (brd->info == NULL)
+ continue;
m++;
}