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staging: dgap: unwind on error in dgap_init_one()

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The dgap_init_one() needs to handle error properly
if one of functions in dgap_init_one() is failed.

Introduce some functions for handling error in dgap_init_one()
 - dgap_tty_unregister() : unregister tty driver
 - dgap_free_flipbuf() : free flip buffer
 - dgap_release_remap() : release memory region and unmapped memory.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daeseok Youn 2014-06-13 18:23:15 +09:00 committed by Greg Kroah-Hartman
parent 3c3befef8f
commit 91177d53a3
1 changed files with 44 additions and 9 deletions
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53
drivers/staging/dgap/dgap.c
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@ -77,6 +77,7 @@ static int dgap_init_pci(void);
static int dgap_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static void dgap_remove_one(struct pci_dev *dev);
static int dgap_do_remap(struct board_t *brd);
static void dgap_release_remap(struct board_t *brd);
static irqreturn_t dgap_intr(int irq, void *voidbrd);
static int dgap_tty_open(struct tty_struct *tty, struct file *file);
@ -122,6 +123,7 @@ static int dgap_tty_put_char(struct tty_struct *tty, unsigned char c);
static void dgap_tty_send_xchar(struct tty_struct *tty, char ch);
static int dgap_tty_register(struct board_t *brd);
static void dgap_tty_unregister(struct board_t *brd);
static int dgap_tty_init(struct board_t *);
static void dgap_tty_free(struct board_t *);
static void dgap_cleanup_tty(struct board_t *);
@ -189,6 +191,7 @@ static void dgap_do_fep_load(struct board_t *brd, const u8 *ufep, int len);
static void dgap_do_conc_load(struct board_t *brd, u8 *uaddr, int len);
#endif
static int dgap_alloc_flipbuf(struct board_t *brd);
static void dgap_free_flipbuf(struct board_t *brd);
static int dgap_request_irq(struct board_t *brd);
static void dgap_free_irq(struct board_t *brd);
@ -586,37 +589,49 @@ static int dgap_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
brd = dgap_board[dgap_numboards++];
rc = dgap_firmware_load(pdev, ent->driver_data, brd);
if (rc)
return rc;
goto cleanup_brd;
rc = dgap_alloc_flipbuf(brd);
if (rc)
return rc;
goto cleanup_brd;
rc = dgap_tty_register(brd);
if (rc)
return rc;
goto free_flipbuf;
rc = dgap_request_irq(brd);
if (rc)
return rc;
goto unregister_tty;
/*
* Do tty device initialization.
*/
rc = dgap_tty_init(brd);
if (rc < 0)
return rc;
goto free_irq;
rc = dgap_tty_register_ports(brd);
if (rc) {
dgap_tty_free(brd);
return rc;
}
if (rc)
goto tty_free;
brd->state = BOARD_READY;
brd->dpastatus = BD_RUNNING;
return 0;
tty_free:
dgap_tty_free(brd);
free_irq:
dgap_free_irq(brd);
unregister_tty:
dgap_tty_unregister(brd);
free_flipbuf:
dgap_free_flipbuf(brd);
cleanup_brd:
dgap_release_remap(brd);
kfree(brd);
dgap_board[--dgap_numboards] = NULL;
return rc;
}
static void dgap_remove_one(struct pci_dev *dev)
@ -1021,6 +1036,12 @@ static int dgap_do_remap(struct board_t *brd)
return 0;
}
static void dgap_release_remap(struct board_t *brd)
{
release_mem_region(brd->membase, 0x200000);
release_mem_region(brd->membase + PCI_IO_OFFSET, 0x200000);
iounmap(brd->re_map_membase);
}
/*****************************************************************************
*
* Function:
@ -1328,6 +1349,14 @@ static int dgap_tty_register(struct board_t *brd)
return rc;
}
static void dgap_tty_unregister(struct board_t *brd)
{
tty_unregister_driver(brd->print_driver);
tty_unregister_driver(brd->serial_driver);
put_tty_driver(brd->print_driver);
put_tty_driver(brd->serial_driver);
}
/*
* dgap_tty_init()
*
@ -4164,6 +4193,12 @@ static int dgap_alloc_flipbuf(struct board_t *brd)
return 0;
}
static void dgap_free_flipbuf(struct board_t *brd)
{
kfree(brd->flipbuf);
kfree(brd->flipflagbuf);
}
/*
* Create pr and tty device entries
*/