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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>
This commit is contained in:
Alexey Khoroshilov 2013-02-17 02:24:37 +04:00 committed by Greg Kroah-Hartman
parent f30e826069
commit 9e17df37d7
1 changed files with 35 additions and 7 deletions
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42
drivers/tty/mxser.c
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@ -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++;
}