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authorHeiko Carstens <heiko.carstens@de.ibm.com>2005-07-29 14:03:36 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-29 15:01:14 -0700
commit350e3ade9ed0809a94c51db6ee66883a35f0d6c9 (patch)
tree8c644bec7a82bdb2b4c0c9d30e65fce4b8c15f69 /arch/s390
parent5712f52e8c024c6b7b82ae5c7b5b3d0f3e6f711b (diff)
downloadlinux-350e3ade9ed0809a94c51db6ee66883a35f0d6c9.tar.bz2
[PATCH] s390: check for interrupt before waiting
The patch that introduced waiting for interrupts after resetting the reader can cause the boot to fail because the system is waiting for an interrupt that will never arrive. Add code to check if an interrupt is supposed to arrive before waiting endlessly. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kernel/head.S7
-rw-r--r--arch/s390/kernel/head64.S7
2 files changed, 14 insertions, 0 deletions
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index d12cff11b4bc..2710e66fefba 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -346,6 +346,13 @@ iplstart:
la %r2,.Lreset
lhi %r3,26
diag %r2,%r3,8
+ la %r5,.Lirb
+ stsch 0(%r5) # check if irq is pending
+ tm 30(%r5),0x0f # by verifying if any of the
+ bnz .Lwaitforirq # activity or status control
+ tm 31(%r5),0xff # bits is set in the schib
+ bz .Lnoreset
+.Lwaitforirq:
mvc 0x78(8),.Lrdrnewpsw # set up IO interrupt psw
.Lwaitrdrirq:
lpsw .Lrdrwaitpsw
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 10bc592c3637..9a8263a153cb 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -345,6 +345,13 @@ iplstart:
la %r2,.Lreset
lhi %r3,26
diag %r2,%r3,8
+ la %r5,.Lirb
+ stsch 0(%r5) # check if irq is pending
+ tm 30(%r5),0x0f # by verifying if any of the
+ bnz .Lwaitforirq # activity or status control
+ tm 31(%r5),0xff # bits is set in the schib
+ bz .Lnoreset
+.Lwaitforirq:
mvc 0x78(8),.Lrdrnewpsw # set up IO interrupt psw
.Lwaitrdrirq:
lpsw .Lrdrwaitpsw