sx, lock boards struct
Fix race condition which may occurs when multiple cards are probed at the
same time. Add mutex to critical sections to avoid this situation.
Signed-off-by: Jiri Slaby <[email protected]>
---
commit fc64499da1089393cd1fa7f4ae079b6ba02b9c43
tree f29f94957ea497b4be3cff4cc65a855799742486
parent d78c239943b72de4f541fcbe178569a78642110e
author Jiri Slaby <[email protected]> Mon, 30 Oct 2006 14:51:33 +0100
committer Jiri Slaby <[email protected]> Mon, 30 Oct 2006 14:51:33 +0100
drivers/char/sx.c | 37 +++++++++++++++++++++++--------------
1 files changed, 23 insertions(+), 14 deletions(-)
diff --git a/drivers/char/sx.c b/drivers/char/sx.c
index 50cd642..42427f4 100644
--- a/drivers/char/sx.c
+++ b/drivers/char/sx.c
@@ -298,6 +298,7 @@ static int sx_init_drivers(void);
static struct tty_driver *sx_driver;
+static DEFINE_MUTEX(sx_boards_lock);
static struct sx_board boards[SX_NBOARDS];
static struct sx_port *sx_ports;
static int sx_initialized;
@@ -1980,7 +1981,6 @@ #endif
}
if (chans) {
- /* board->flags |= SX_BOARD_PRESENT; */
if(board->irq > 0) {
/* fixed irq, probably PCI */
if(sx_irqmask & (1 << board->irq)) { /* may we use this irq? */
@@ -2115,8 +2115,6 @@ static int __devinit probe_sx (struct sx
return 0;
sx_dprintk (SX_DEBUG_INIT, "reset the board...\n");
- board->flags |= SX_BOARD_PRESENT;
-
func_exit();
return 1;
}
@@ -2211,8 +2209,6 @@ static int __devinit probe_si (struct sx
return 0;
sx_dprintk (SX_DEBUG_INIT, "reset the board...\n");
- board->flags |= SX_BOARD_PRESENT;
-
func_exit();
return 1;
}
@@ -2396,10 +2392,15 @@ static int __devinit sx_eisa_probe(struc
unsigned int i;
int retval = -EIO;
+ mutex_lock(&sx_boards_lock);
i = sx_find_free_board();
-
- if (i == SX_NBOARDS)
+ if (i == SX_NBOARDS) {
+ mutex_unlock(&sx_boards_lock);
goto err;
+ }
+ board = &boards[i];
+ board->flags |= SX_BOARD_PRESENT;
+ mutex_unlock(&sx_boards_lock);
dev_info(dev, "XIO : Signature found in EISA slot %lu, "
"Product %d Rev %d (REPORT THIS TO LKLM)\n",
@@ -2407,7 +2408,6 @@ static int __devinit sx_eisa_probe(struc
inb(eisa_slot + EISA_VENDOR_ID_OFFSET + 2),
inb(eisa_slot + EISA_VENDOR_ID_OFFSET + 3));
- board = &boards[i];
board->eisa_base = eisa_slot;
board->flags &= ~SX_BOARD_TYPE;
board->flags |= SI_EISA_BOARD;
@@ -2430,6 +2430,7 @@ static int __devinit sx_eisa_probe(struc
return 0;
err_unmap:
iounmap(board->base);
+ board->flags &= ~SX_BOARD_PRESENT;
err:
return retval;
}
@@ -2498,16 +2499,19 @@ static int __devinit sx_pci_probe(struct
unsigned int i;
int retval = -EIO;
+ mutex_lock(&sx_boards_lock);
i = sx_find_free_board();
-
- if (i == SX_NBOARDS)
+ if (i == SX_NBOARDS) {
+ mutex_unlock(&sx_boards_lock);
goto err;
+ }
+ board = &boards[i];
+ board->flags |= SX_BOARD_PRESENT;
+ mutex_unlock(&sx_boards_lock);
retval = pci_enable_device(pdev);
if (retval)
- goto err;
-
- board = &boards[i];
+ goto err_flag;
board->flags &= ~SX_BOARD_TYPE;
board->flags |= (pdev->subsystem_vendor == 0x200) ? SX_PCI_BOARD :
@@ -2522,7 +2526,7 @@ static int __devinit sx_pci_probe(struct
board->base = ioremap(board->hw_base, WINDOW_LEN (board));
if (!board->base) {
dev_err(&pdev->dev, "ioremap failed\n");
- goto err;
+ goto err_flag;
}
/* Most of the stuff on the CF board is offset by 0x18000 .... */
@@ -2546,6 +2550,8 @@ static int __devinit sx_pci_probe(struct
return 0;
err_unmap:
iounmap(board->base2);
+err_flag:
+ board->flags &= ~SX_BOARD_PRESENT;
err:
return retval;
}
@@ -2611,6 +2617,7 @@ #ifdef CONFIG_ISA
board->irq = sx_irqmask?-1:0;
if (probe_sx (board)) {
+ board->flags |= SX_BOARD_PRESENT;
found++;
} else {
iounmap(board->base);
@@ -2627,6 +2634,7 @@ #ifdef CONFIG_ISA
board->irq = sx_irqmask ?-1:0;
if (probe_si (board)) {
+ board->flags |= SX_BOARD_PRESENT;
found++;
} else {
iounmap (board->base);
@@ -2642,6 +2650,7 @@ #ifdef CONFIG_ISA
board->irq = sx_irqmask ?-1:0;
if (probe_si (board)) {
+ board->flags |= SX_BOARD_PRESENT;
found++;
} else {
iounmap (board->base);
-
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