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From: Greg Kroah-Hartman on 10 Aug 2010 18:20
From: Alan Cox <alan(a)linux.intel.com>

This lets us avoid problems with races on the flag changes

Signed-off-by: Alan Cox <alan(a)linux.intel.com>
Cc: Arnd Bergmann <arnd(a)arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>
---
drivers/char/istallion.c | 36 ++++++++++++++++++------------------
include/linux/istallion.h | 2 +-
2 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/drivers/char/istallion.c b/drivers/char/istallion.c
index 750650c..5e9a81d 100644
--- a/drivers/char/istallion.c
+++ b/drivers/char/istallion.c
@@ -14,7 +14,6 @@
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
- * FIXME: brdp->state needs proper locking.
*/

/*****************************************************************************/
@@ -204,9 +203,9 @@ static int stli_shared;
* the board has been detected, and whether it is actually running a slave
* or not.
*/
-#define BST_FOUND 0x1
-#define BST_STARTED 0x2
-#define BST_PROBED 0x4
+#define BST_FOUND 0
+#define BST_STARTED 1
+#define BST_PROBED 2

/*
* Define the set of port state flags. These are marked for internal
@@ -817,7 +816,7 @@ static int stli_open(struct tty_struct *tty, struct file *filp)
brdp = stli_brds[brdnr];
if (brdp == NULL)
return -ENODEV;
- if ((brdp->state & BST_STARTED) == 0)
+ if (!test_bit(BST_STARTED, &brdp->state))
return -ENODEV;
portnr = MINOR2PORT(minordev);
if (portnr > brdp->nrports)
@@ -1847,7 +1846,7 @@ static void stli_portinfo(struct seq_file *m, struct stlibrd *brdp, struct stlip
rc = stli_portcmdstats(NULL, portp);

uart = "UNKNOWN";
- if (brdp->state & BST_STARTED) {
+ if (test_bit(BST_STARTED, &brdp->state)) {
switch (stli_comstats.hwid) {
case 0: uart = "2681"; break;
case 1: uart = "SC26198"; break;
@@ -1856,7 +1855,7 @@ static void stli_portinfo(struct seq_file *m, struct stlibrd *brdp, struct stlip
}
seq_printf(m, "%d: uart:%s ", portnr, uart);

- if ((brdp->state & BST_STARTED) && (rc >= 0)) {
+ if (test_bit(BST_STARTED, &brdp->state) && rc >= 0) {
char sep;

seq_printf(m, "tx:%d rx:%d", (int) stli_comstats.txtotal,
@@ -2356,7 +2355,7 @@ static void stli_poll(unsigned long arg)
brdp = stli_brds[brdnr];
if (brdp == NULL)
continue;
- if ((brdp->state & BST_STARTED) == 0)
+ if (!test_bit(BST_STARTED, &brdp->state))
continue;

spin_lock(&brd_lock);
@@ -3141,7 +3140,7 @@ static int stli_initecp(struct stlibrd *brdp)
}


- brdp->state |= BST_FOUND;
+ set_bit(BST_FOUND, &brdp->state);
return 0;
err_unmap:
iounmap(brdp->membase);
@@ -3298,7 +3297,7 @@ static int stli_initonb(struct stlibrd *brdp)
brdp->panels[0] = brdp->nrports;


- brdp->state |= BST_FOUND;
+ set_bit(BST_FOUND, &brdp->state);
return 0;
err_unmap:
iounmap(brdp->membase);
@@ -3408,7 +3407,7 @@ stli_donestartup:
spin_unlock_irqrestore(&brd_lock, flags);

if (rc == 0)
- brdp->state |= BST_STARTED;
+ set_bit(BST_STARTED, &brdp->state);

if (! stli_timeron) {
stli_timeron++;
@@ -3711,7 +3710,7 @@ static int __devinit stli_pciprobe(struct pci_dev *pdev,
if (retval)
goto err_null;

- brdp->state |= BST_PROBED;
+ set_bit(BST_PROBED, &brdp->state);
pci_set_drvdata(pdev, brdp);

EBRDENABLE(brdp);
@@ -3842,7 +3841,7 @@ static int __init stli_initbrds(void)
brdp = stli_brds[i];
if (brdp == NULL)
continue;
- if (brdp->state & BST_FOUND) {
+ if (test_bit(BST_FOUND, &brdp->state)) {
EBRDENABLE(brdp);
brdp->enable = NULL;
brdp->disable = NULL;
@@ -4079,7 +4078,7 @@ static int stli_portcmdstats(struct tty_struct *tty, struct stliport *portp)
return -ENODEV;

mutex_lock(&portp->port.mutex);
- if (brdp->state & BST_STARTED) {
+ if (test_bit(BST_STARTED, &brdp->state)) {
if ((rc = stli_cmdwait(brdp, portp, A_GETSTATS,
&stli_cdkstats, sizeof(asystats_t), 1)) < 0) {
mutex_unlock(&portp->port.mutex);
@@ -4194,7 +4193,7 @@ static int stli_clrportstats(struct stliport *portp, comstats_t __user *cp)

mutex_lock(&portp->port.mutex);

- if (brdp->state & BST_STARTED) {
+ if (test_bit(BST_STARTED, &brdp->state)) {
if ((rc = stli_cmdwait(brdp, portp, A_CLEARSTATS, NULL, 0, 0)) < 0) {
mutex_unlock(&portp->port.mutex);
return rc;
@@ -4323,10 +4322,10 @@ static long stli_memioctl(struct file *fp, unsigned int cmd, unsigned long arg)
rc = stli_startbrd(brdp);
break;
case STL_BSTOP:
- brdp->state &= ~BST_STARTED;
+ clear_bit(BST_STARTED, &brdp->state);
break;
case STL_BRESET:
- brdp->state &= ~BST_STARTED;
+ clear_bit(BST_STARTED, &brdp->state);
EBRDRESET(brdp);
if (stli_shared == 0) {
if (brdp->reenable != NULL)
@@ -4382,7 +4381,8 @@ static void istallion_cleanup_isa(void)
unsigned int j;

for (j = 0; (j < stli_nrbrds); j++) {
- if ((brdp = stli_brds[j]) == NULL || (brdp->state & BST_PROBED))
+ if ((brdp = stli_brds[j]) == NULL ||
+ test_bit(BST_PROBED, &brdp->state))
continue;

stli_cleanup_ports(brdp);
diff --git a/include/linux/istallion.h b/include/linux/istallion.h
index 7faca98..ad700a6 100644
--- a/include/linux/istallion.h
+++ b/include/linux/istallion.h
@@ -86,7 +86,7 @@ struct stlibrd {
unsigned long magic;
unsigned int brdnr;
unsigned int brdtype;
- unsigned int state;
+ unsigned long state;
unsigned int nrpanels;
unsigned int nrports;
unsigned int nrdevs;
--
1.7.2

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Prev: [PATCH 25/68] tty: serial - fix tty back references in termios
Next: [PATCH 28/68] tty: Make vt's have a tty_port