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authorJiri Slaby <jirislaby@gmail.com>2007-07-17 15:05:17 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-17 21:23:10 +0400
commit5b21f9dddd0817b761f1407f1950bee4f257411a (patch)
tree5c63ba601347b3723d7466bc5c5afd21256829b4 /drivers/char/isicom.c
parentc4923b4f13156455a9e84f0b918866aef300cc57 (diff)
downloadlinux-5b21f9dddd0817b761f1407f1950bee4f257411a.tar.xz
Char: isicom, cleanup locking
Don't spin processor when not needed (use sleep instead of delay). Don't release the lock when needed in next iteration -- this actually fixes a bug -- missing braces Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/isicom.c')
-rw-r--r--drivers/char/isicom.c65
1 files changed, 27 insertions, 38 deletions
diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 761f77740d67..b133b92a0ad5 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -243,17 +243,18 @@ static inline int WaitTillCardIsFree(u16 base)
static int lock_card(struct isi_board *card)
{
- char retries;
unsigned long base = card->base;
+ unsigned int retries, a;
- for (retries = 0; retries < 100; retries++) {
+ for (retries = 0; retries < 10; retries++) {
spin_lock_irqsave(&card->card_lock, card->flags);
- if (inw(base + 0xe) & 0x1) {
- return 1;
- } else {
- spin_unlock_irqrestore(&card->card_lock, card->flags);
- udelay(1000); /* 1ms */
+ for (a = 0; a < 10; a++) {
+ if (inw(base + 0xe) & 0x1)
+ return 1;
+ udelay(10);
}
+ spin_unlock_irqrestore(&card->card_lock, card->flags);
+ msleep(10);
}
printk(KERN_WARNING "ISICOM: Failed to lock Card (0x%lx)\n",
card->base);
@@ -261,23 +262,6 @@ static int lock_card(struct isi_board *card)
return 0; /* Failed to acquire the card! */
}
-static int lock_card_at_interrupt(struct isi_board *card)
-{
- unsigned char retries;
- unsigned long base = card->base;
-
- for (retries = 0; retries < 200; retries++) {
- spin_lock_irqsave(&card->card_lock, card->flags);
-
- if (inw(base + 0xe) & 0x1)
- return 1;
- else
- spin_unlock_irqrestore(&card->card_lock, card->flags);
- }
- /* Failing in interrupt is an acceptable event */
- return 0; /* Failed to acquire the card! */
-}
-
static void unlock_card(struct isi_board *card)
{
spin_unlock_irqrestore(&card->card_lock, card->flags);
@@ -415,6 +399,8 @@ static inline int __isicom_paranoia_check(struct isi_port const *port,
static void isicom_tx(unsigned long _data)
{
+ unsigned long flags;
+ unsigned int retries;
short count = (BOARD_COUNT-1), card, base;
short txcount, wrd, residue, word_count, cnt;
struct isi_port *port;
@@ -435,32 +421,34 @@ static void isicom_tx(unsigned long _data)
count = isi_card[card].port_count;
port = isi_card[card].ports;
base = isi_card[card].base;
+
+ spin_lock_irqsave(&isi_card[card].card_lock, flags);
+ for (retries = 0; retries < 100; retries++) {
+ if (inw(base + 0xe) & 0x1)
+ break;
+ udelay(2);
+ }
+ if (retries >= 100)
+ goto unlock;
+
for (;count > 0;count--, port++) {
- if (!lock_card_at_interrupt(&isi_card[card]))
- continue;
/* port not active or tx disabled to force flow control */
if (!(port->flags & ASYNC_INITIALIZED) ||
!(port->status & ISI_TXOK))
- unlock_card(&isi_card[card]);
continue;
tty = port->tty;
-
- if (tty == NULL) {
- unlock_card(&isi_card[card]);
+ if (tty == NULL)
continue;
- }
txcount = min_t(short, TX_SIZE, port->xmit_cnt);
- if (txcount <= 0 || tty->stopped || tty->hw_stopped) {
- unlock_card(&isi_card[card]);
+ if (txcount <= 0 || tty->stopped || tty->hw_stopped)
continue;
- }
- if (!(inw(base + 0x02) & (1 << port->channel))) {
- unlock_card(&isi_card[card]);
+
+ if (!(inw(base + 0x02) & (1 << port->channel)))
continue;
- }
+
pr_dbg("txing %d bytes, port%d.\n", txcount,
port->channel + 1);
outw((port->channel << isi_card[card].shift_count) | txcount,
@@ -508,9 +496,10 @@ static void isicom_tx(unsigned long _data)
port->status &= ~ISI_TXOK;
if (port->xmit_cnt <= WAKEUP_CHARS)
tty_wakeup(tty);
- unlock_card(&isi_card[card]);
}
+unlock:
+ spin_unlock_irqrestore(&isi_card[card].card_lock, flags);
/* schedule another tx for hopefully in about 10ms */
sched_again:
if (!re_schedule) {