FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2024-12-27 03:47:43 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

s390/hmcdrv: fix interrupt registration

Browse Source 
The z/VM driver sets bit "63-22" in control register zero to one in order
to enable the CP Service interrupt (0x2603). However the irq subclass mask
that normally corresponds to the CP Service interrupt is
"63-54" (== "63-22-32").

So it looks like the author read the documentation with the 32 bit sized
cr0 register bit positions (== 22), but didn't realize that bit numbers
change, if applied to a 64 bit register (== 54) due to the numbering
scheme.

Also use irq_subclass_register() instead if ctl_set_bit() since multiple
services depend on the service signal subclass mask, which is the correct
bit. This also explains why nobody noticed the bug, since the bit is always
enabled anyway (e.g. pfault).

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2015-08-17 07:56:20 +02:00 committed by Martin Schwidefsky
parent 89b1145e93
commit e619cd3d61
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/s390/char/diag_ftp.c
View File

@ -223,7 +223,7 @@ int diag_ftp_startup(void)
if (rc)
return rc;
ctl_set_bit(0, 63 - 22);
irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
return 0;
}
@ -232,6 +232,6 @@ int diag_ftp_startup(void)
*/
void diag_ftp_shutdown(void)
{
ctl_clear_bit(0, 63 - 22);
irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL);
unregister_external_irq(EXT_IRQ_CP_SERVICE, diag_ftp_handler);
}