diff options
| author | Andrew Vasquez <andrew.vasquez@qlogic.com> | 2008-09-29 15:15:04 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-10-08 20:22:51 -0700 |
| commit | 61c8bd1d3a9e7e57843d98d9b133fec77ecf4e1b (patch) | |
| tree | bed9fcd7e2d95237f99b0f5ae7011a3bc3ca1840 | |
| parent | 90e21dd5346538810cff7f5fa2d3b0ae4c88989d (diff) | |
SCSI: qla2xxx: Defer enablement of RISC interrupts until ISP initialization completes.
commit 048feec5548c0582ee96148c61b87cccbcb5f9be upstream
Josip Rodin noted
(http://article.gmane.org/gmane.linux.ports.sparc/10152) the
driver oopsing during registration of an rport to the
FC-transport layer with a backtrace indicating a dereferencing of
an shost->shost_data equal to NULL. David Miller identified a
small window in driver logic where this could happen:
> Look at how the driver registers the IRQ handler before the host has
> been registered with the SCSI layer.
>
> That leads to a window of time where the shost hasn't been setup
> fully, yet ISRs can come in and trigger DPC thread events, such as
> loop resyncs, which expect the transport area to be setup.
>
> But it won't be setup, because scsi_add_host() hasn't finished yet.
>
> Note that in Josip's crash log, we don't even see the
>
> qla_printk(KERN_INFO, ha, "\n"
> " QLogic Fibre Channel HBA Driver: %s\n"
> " QLogic %s - %s\n"
> " ISP%04X: %s @ %s hdma%c, host#=%ld, fw=%s\n",
> ...
>
> message yet.
>
> Which means that the crash occurs between qla2x00_request_irqs()
> and printing that message.
Close this window by enabling RISC interrupts after the host has
been registered with the SCSI midlayer.
Reported-by: Josip Rodin <joy@entuzijast.net>
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_isr.c | 1 | ||||
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_os.c | 2 |
2 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c index ec63b79f900..d191cecd417 100644 --- a/drivers/scsi/qla2xxx/qla_isr.c +++ b/drivers/scsi/qla2xxx/qla_isr.c @@ -1838,7 +1838,6 @@ clear_risc_ints: WRT_REG_WORD(®->isp.hccr, HCCR_CLR_HOST_INT); } spin_unlock_irq(&ha->hardware_lock); - ha->isp_ops->enable_intrs(ha); fail: return ret; diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c index 047ee644aa9..4c6b90222b7 100644 --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -1740,6 +1740,8 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id) if (ret) goto probe_failed; + ha->isp_ops->enable_intrs(ha); + scsi_scan_host(host); qla2x00_alloc_sysfs_attr(ha); |