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authorLinus Torvalds <torvalds@linux-foundation.org>2010-01-18 14:08:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-01-18 14:08:55 -0800
commit8888be69adea1d86d694096cb206ef570e2d691a (patch)
treeba3fd0c0b7d7dd7c8d7b7afeb56f094b65ebdb66 /drivers/serial
parent1e868d8e6d2c4b8736cdf7a4bd5701e4f527f722 (diff)
parent78924577f493c6fa62e2b38356faa542fa7583e6 (diff)
Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: powerpc: Move cpu hotplug driver lock from pseries to powerpc powerpc: Move /proc/ppc64 to /proc/powerpc update powerpc/8xx: Fix user space TLB walk in dcbX fixup powerpc: Fix decrementer setup on 1GHz boards powerpc/iseries: Initialise on-stack completion powerpc/hvc: Driver build breaks with !HVC_CONSOLE serial/pmac_zilog: Workaround problem due to interrupt on closed port powerpc/macintosh: Make Open Firmware device id constant powerpc: Use helpers for rlimits powerpc: cpumask_of_node() should handle -1 as a node powerpc/pseries: Fix dlpar compile warning without CONFIG_PROC_DEVICETREE powerpc/pseries: Fix xics interrupt affinity powerpc/swsusp_32: Fix TLB invalidation powerpc/8xx: Always pin kernel instruction TLB powerpc: 2.6.33 update of defconfigs for embedded 6xx/7xxx, 8xx, 8xxx powerpc: Use scripts/mkuboot.sh instead of 'mkimage' powerpc/5200: update defconfigs
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/pmac_zilog.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/serial/pmac_zilog.c b/drivers/serial/pmac_zilog.c
index 0700cd10b97c..683e66f18e8c 100644
--- a/drivers/serial/pmac_zilog.c
+++ b/drivers/serial/pmac_zilog.c
@@ -411,6 +411,17 @@ static void pmz_transmit_chars(struct uart_pmac_port *uap)
goto ack_tx_int;
}
+ /* Under some circumstances, we see interrupts reported for
+ * a closed channel. The interrupt mask in R1 is clear, but
+ * R3 still signals the interrupts and we see them when taking
+ * an interrupt for the other channel (this could be a qemu
+ * bug but since the ESCC doc doesn't specify precsiely whether
+ * R3 interrup status bits are masked by R1 interrupt enable
+ * bits, better safe than sorry). --BenH.
+ */
+ if (!ZS_IS_OPEN(uap))
+ goto ack_tx_int;
+
if (uap->port.x_char) {
uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
write_zsdata(uap, uap->port.x_char);