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[PATCH] s390: check for interrupt before waiting

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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>
This commit is contained in:
Heiko Carstens 2005-07-29 14:03:36 -07:00 committed by Linus Torvalds
parent 5712f52e8c
commit 350e3ade9e
2 changed files with 14 additions and 0 deletions
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7
arch/s390/kernel/head.S
View File

@ -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

7
arch/s390/kernel/head64.S
View File

@ -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