From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Mon, 5 Feb 2007 20:17:16 +0000 (+0100)
Subject: [S390] sclp: don't call local_bh_disable/_local_bh_enable if in_interrupt()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c59d744bd8a0e283daf6726881e4c9aa4bd25261;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

[S390] sclp: don't call local_bh_disable/_local_bh_enable if in_interrupt()

local_bh_disable/_local_bh_enable must not be called if in_irq() is
true. Besides that if in_interrupt() is true bottom halves are
disabled anyway.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index 3457a9a31571..027cdc18df31 100644
--- a/drivers/s390/char/sclp.c
+++ b/drivers/s390/char/sclp.c
@@ -402,6 +402,7 @@ sclp_sync_wait(void)
 	unsigned long flags;
 	unsigned long cr0, cr0_sync;
 	u64 timeout;
+	int irq_context;
 
 	/* We'll be disabling timer interrupts, so we need a custom timeout
 	 * mechanism */
@@ -414,7 +415,9 @@ sclp_sync_wait(void)
 	}
 	local_irq_save(flags);
 	/* Prevent bottom half from executing once we force interrupts open */
-	local_bh_disable();
+	irq_context = in_interrupt();
+	if (!irq_context)
+		local_bh_disable();
 	/* Enable service-signal interruption, disable timer interrupts */
 	trace_hardirqs_on();
 	__ctl_store(cr0, 0, 0);
@@ -435,7 +438,8 @@ sclp_sync_wait(void)
 	}
 	local_irq_disable();
 	__ctl_load(cr0, 0, 0);
-	_local_bh_enable();
+	if (!irq_context)
+		_local_bh_enable();
 	local_irq_restore(flags);
 }