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authorJiri Slaby <jirislaby@gmail.com>2007-10-18 03:06:22 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:26 -0700
commit1c0a387c1f9e48e480579d3b4e0f9c1a36c77751 (patch)
treea105b276483f2684efccedf00b147baa3e43f1df /drivers/char
parentce97a09767b59dcde3715ba4a9eebc71b0ce71b2 (diff)
Char: cyclades, move spin_lock to one place
Lock whole processing in isr, avoid error-prone locking/unlocking in rx/tx esp. On fail paths (there was a bug in the past yet). 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')
-rw-r--r--drivers/char/cyclades.c9
1 files changed, 2 insertions, 7 deletions
diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
index 39bfe043fba8..46a15d24ce7d 100644
--- a/drivers/char/cyclades.c
+++ b/drivers/char/cyclades.c
@@ -994,7 +994,6 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
printk(KERN_DEBUG "cyy_interrupt: rcvd intr, chip %d\n", chip);
#endif
/* determine the channel & change to that context */
- spin_lock(&cinfo->card_lock);
save_xir = (u_char) readb(base_addr + (CyRIR << index));
channel = (u_short) (save_xir & CyIRChannel);
info = &cinfo->ports[channel + chip * 4];
@@ -1031,7 +1030,6 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
if (data & info->ignore_status_mask) {
info->icount.rx++;
- spin_unlock(&cinfo->card_lock);
return;
}
if (tty_buffer_request_room(tty, 1)) {
@@ -1116,7 +1114,6 @@ end:
/* end of service */
cy_writeb(base_addr + (CyRIR << index), save_xir & 0x3f);
cy_writeb(base_addr + (CyCAR << index), save_car);
- spin_unlock(&cinfo->card_lock);
}
static void cyy_chip_tx(struct cyclades_card *cinfo, int chip,
@@ -1135,7 +1132,6 @@ static void cyy_chip_tx(struct cyclades_card *cinfo, int chip,
#endif
/* determine the channel & change to that context */
- spin_lock(&cinfo->card_lock);
save_xir = (u_char) readb(base_addr + (CyTIR << index));
channel = (u_short) (save_xir & CyIRChannel);
save_car = readb(base_addr + (CyCAR << index));
@@ -1240,7 +1236,6 @@ end:
/* end of service */
cy_writeb(base_addr + (CyTIR << index), save_xir & 0x3f);
cy_writeb(base_addr + (CyCAR << index), save_car);
- spin_unlock(&cinfo->card_lock);
}
static void cyy_chip_modem(struct cyclades_card *cinfo, int chip,
@@ -1251,7 +1246,6 @@ static void cyy_chip_modem(struct cyclades_card *cinfo, int chip,
int save_xir, channel, save_car, index = cinfo->bus_index;
/* determine the channel & change to that context */
- spin_lock(&cinfo->card_lock);
save_xir = (u_char) readb(base_addr + (CyMIR << index));
channel = (u_short) (save_xir & CyIRChannel);
info = &cinfo->ports[channel + chip * 4];
@@ -1315,7 +1309,6 @@ end:
/* end of service */
cy_writeb(base_addr + (CyMIR << index), save_xir & 0x3f);
cy_writeb(base_addr + (CyCAR << index), save_car);
- spin_unlock(&cinfo->card_lock);
}
/* The real interrupt service routine is called
@@ -1367,12 +1360,14 @@ static irqreturn_t cyy_interrupt(int irq, void *dev_id)
*/
if (1000 < too_many++)
break;
+ spin_lock(&cinfo->card_lock);
if (status & CySRReceive) /* rx intr */
cyy_chip_rx(cinfo, chip, base_addr);
if (status & CySRTransmit) /* tx intr */
cyy_chip_tx(cinfo, chip, base_addr);
if (status & CySRModem) /* modem intr */
cyy_chip_modem(cinfo, chip, base_addr);
+ spin_unlock(&cinfo->card_lock);
}
}
} while (had_work);