tree 32cd71dcc7e6e421b3622ea1dcd91733851217d2
parent 89a342ca6bfc1a014ff50cce5659abc58e11ecfc
author Stephen M. Cameron <scameron@beardog.cce.hp.com> 1335890529 -0500
committer James Bottomley <JBottomley@Parallels.com> 1336637276 +0100

[SCSI] hpsa: call pci_disable_device on driver unload

As Jenx Axboe explained to me: "In earlier times (2.6.18 and pre, iirc), Linux
disabled IO and mem bars on pci_disable_device(). Now in newer kernel it does
not. And in the newer kernels you run into problems if you DON'T disable the
device on exit, since when it later loads the device is already in the enabled
state - and pci_enable_device() then does nothing. This typically screws
MSI/MSI-X." This is what the big scary comment that says pci_disable_device
does "something nasty" to smart arrays was evidently referring to.

If pci_disable_device is not called on driver rmmod, subsequently insmod'ing
the driver may in result in some cases fail to be able to receive interrupts,
esp.  if other drivers are loaded between unloading and loading hpsa.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>