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| author | Andrew Vasquez <andrew.vasquez@qlogic.com> | 2008-09-11 22:19:45 -0700 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-09-13 13:12:58 -0500 |
| commit | 048feec5548c0582ee96148c61b87cccbcb5f9be (patch) | |
| tree | aedac3da0b10199ffb198a8d900cea43063d7194 /drivers | |
| parent | a551b98d5f6fce5897d497abd8bfb262efb33d2a (diff) | |
| download | linux-048feec5548c0582ee96148c61b87cccbcb5f9be.tar.gz linux-048feec5548c0582ee96148c61b87cccbcb5f9be.tar.bz2 linux-048feec5548c0582ee96148c61b87cccbcb5f9be.zip | |
[SCSI] qla2xxx: Defer enablement of RISC interrupts until ISP initialization completes.
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>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers')
| -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 45a3b93eed57..bf41887cdd65 100644 --- a/drivers/scsi/qla2xxx/qla_isr.c +++ b/drivers/scsi/qla2xxx/qla_isr.c @@ -1834,7 +1834,6 @@ 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 26afe44265c7..6d0f0e5f2827 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); |