diff options
| author | Manoj N. Kumar <manoj@linux.vnet.ibm.com> | 2016-03-25 14:26:34 -0500 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2016-03-28 20:43:17 -0400 |
| commit | 9526f36026f778e82b5175249443854c03b2e660 (patch) | |
| tree | 5f2e14c46a6f336253d66566d436379a83f7c0a3 /drivers/scsi/cxlflash/main.h | |
| parent | 5ec8a1753bc29efa7e4b1391d691c9c719b30257 (diff) | |
cxlflash: Fix regression issue with re-ordering patch
While running 'sg_reset -H' back to back the following exception was seen:
[ 735.115695] Faulting instruction address: 0xd0000000098c0864
cpu 0x0: Vector: 300 (Data Access) at [c000000ffffafa80]
pc: d0000000098c0864: cxlflash_async_err_irq+0x84/0x5c0 [cxlflash]
lr: c00000000013aed0: handle_irq_event_percpu+0xa0/0x310
sp: c000000ffffafd00
msr: 9000000000009033
dar: 2010000
dsisr: 40000000
current = 0xc000000001510880
paca = 0xc00000000fb80000 softe: 0 irq_happened: 0x01
pid = 0, comm = swapper/0
Linux version 4.5.0-491-26f710d+
enter ? for help
[c000000ffffafe10] c00000000013aed0 handle_irq_event_percpu+0xa0/0x310
[c000000ffffafed0] c00000000013b1a8 handle_irq_event+0x68/0xc0
[c000000ffffaff00] c0000000001404ec handle_fasteoi_irq+0xec/0x2a0
[c000000ffffaff30] c00000000013a084 generic_handle_irq+0x54/0x80
[c000000ffffaff60] c000000000011130 __do_irq+0x80/0x1d0
[c000000ffffaff90] c000000000024d40 call_do_irq+0x14/0x24
[c000000001573a20] c000000000011318 do_IRQ+0x98/0x140
[c000000001573a70] c000000000002594 hardware_interrupt_common+0x114/0x180
This exception is being hit because the async_err interrupt path performs
an MMIO to read the interrupt status register. The MMIO region in this
case is not available.
Commit 6ded8b3cbd9a ("cxlflash: Unmap problem state area before detaching
master context") re-ordered the sequence in which term_mc() and stop_afu()
are called. This introduces a window for interrupts to come in with the
problem space area unmapped, that did not exist previously.
The fix is to separate the disabling of all AFU interrupts to a distinct
function, term_intr() so that it is the first thing that is done in the
tear down process.
To keep the initialization process symmetric, separate the AFU interrupt
setup also to a distinct function: init_intr().
Fixes: 6ded8b3cbd9a ("cxlflash: Unmap problem state area before detaching master context")
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/cxlflash/main.h')
| -rw-r--r-- | drivers/scsi/cxlflash/main.h | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/scsi/cxlflash/main.h b/drivers/scsi/cxlflash/main.h index 0faed422c7f4..eb9d8f730b38 100644 --- a/drivers/scsi/cxlflash/main.h +++ b/drivers/scsi/cxlflash/main.h @@ -79,12 +79,11 @@ #define WWPN_BUF_LEN (WWPN_LEN + 1) enum undo_level { - RELEASE_CONTEXT = 0, + UNDO_NOOP = 0, FREE_IRQ, UNMAP_ONE, UNMAP_TWO, - UNMAP_THREE, - UNDO_START + UNMAP_THREE }; struct dev_dependent_vals { |