| Commit message (Collapse) | Author | Age |
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The SLUB allocator relies on struct page fields first_page and slab,
overwritten by ptl when SPLIT_PTLOCK: so the SLUB allocator cannot then
be used for the lowest level of pagetable pages. This was obstructing
SLUB on PowerPC, which uses kmem_caches for its pagetables. So convert
its pte level to use normal gfp pages (whereas pmd, pud and 64k-page pgd
want partpages, so continue to use kmem_caches for pmd, pud and pgd).
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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This adds an option to spufs when the kernel is configured for
4K page to give it the ability to use 64K pages for SPE local store
mappings.
Currently, we are optimistic and try order 4 allocations when creating
contexts. If that fails, the code will fallback to 4K automatically.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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This adds the ability for a kernel compiled with 4K page size
to have special slices containing 64K pages and hash the right type
of hash PTEs.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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The basic issue is to be able to do what hugetlbfs does but with
different page sizes for some other special filesystems; more
specifically, my need is:
- Huge pages
- SPE local store mappings using 64K pages on a 4K base page size
kernel on Cell
- Some special 4K segments in 64K-page kernels for mapping a dodgy
type of powerpc-specific infiniband hardware that requires 4K MMU
mappings for various reasons I won't explain here.
The main issues are:
- To maintain/keep track of the page size per "segment" (as we can
only have one page size per segment on powerpc, which are 256MB
divisions of the address space).
- To make sure special mappings stay within their allotted
"segments" (including MAP_FIXED crap)
- To make sure everybody else doesn't mmap/brk/grow_stack into a
"segment" that is used for a special mapping
Some of the necessary mechanisms to handle that were present in the
hugetlbfs code, but mostly in ways not suitable for anything else.
The patch relies on some changes to the generic get_unmapped_area()
that just got merged. It still hijacks hugetlb callbacks here or
there as the generic code hasn't been entirely cleaned up yet but
that shouldn't be a problem.
So what is a slice ? Well, I re-used the mechanism used formerly by our
hugetlbfs implementation which divides the address space in
"meta-segments" which I called "slices". The division is done using
256MB slices below 4G, and 1T slices above. Thus the address space is
divided currently into 16 "low" slices and 16 "high" slices. (Special
case: high slice 0 is the area between 4G and 1T).
Doing so simplifies significantly the tracking of segments and avoids
having to keep track of all the 256MB segments in the address space.
While I used the "concepts" of hugetlbfs, I mostly re-implemented
everything in a more generic way and "ported" hugetlbfs to it.
Slices can have an associated page size, which is encoded in the mmu
context and used by the SLB miss handler to set the segment sizes. The
hash code currently doesn't care, it has a specific check for hugepages,
though I might add a mechanism to provide per-slice hash mapping
functions in the future.
The slice code provide a pair of "generic" get_unmapped_area() (bottomup
and topdown) functions that should work with any slice size. There is
some trickiness here so I would appreciate people to have a look at the
implementation of these and let me know if I got something wrong.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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The code for demoting segments to 4K had some issues, like for example,
when using _PAGE_4K_PFN flag, the first CPU to hit it would do the
demotion, but other CPUs hitting the same page wouldn't properly flush
their SLBs if mmu_ci_restriction isn't set. There are also potential
issues with hash_preload not handling _PAGE_4K_PFN. All of these are
non issues on current hardware but might bite us in the future.
This patch thus fixes it by:
- Taking the test comparing the mm and current CPU context page
sizes to decide to flush SLBs out of the mmu_ci_restrictions test
since that can also be triggered by _PAGE_4K_PFN pages
- Due to the above being done all the time, demote_segment_4k
doesn't need update the context and flush the SLB
- demote_segment_4k can be static and doesn't need an EXPORT_SYMBOL
- Making hash_preload ignore anything that has either _PAGE_4K_PFN
or _PAGE_NO_CACHE set, thus avoiding duplication of the complicated
logic in hash_page() (and possibly making hash_preload a little bit
faster for the normal case).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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This makes the new iSeries virtual console drivers (nvc_iseries) the
default and prevents viocons being built unless explicitly selected.
Also it makes no sense to have the console as a module.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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lparmap.c: Assembler messages:
lparmap.c:51: Warning: ignoring changed section attributes for .text
Idea from Segher Boessenkool.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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On some powerpc architectures (notably 64-bit powermac) there is a memory
hole, for example on powermacs between 2G and 4G. Since we use the flat
memory model regardless, these pages must be marked as nosave (for suspend
to disk.)
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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This patch introduces a new register_nosave_region_late function that
can be called from initcalls when register_nosave_region can no longer
be used because it uses bootmem.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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In the process of rewriting the x86 setup code, I found a number of
inaccuracies and outdated recommendations in the boot protocol
documentation. Revamp to make it more up to date.
In particular, the common use of the heap actually requires (slightly)
more than 4K of heap plus stack, which is the recommended amount in
the document; currently the code compensates by being smaller than
specified, but we can't assume that will be true forever. Thus,
recommend that if we have a modern bzImage kernel, that the bootloader
maximizes the available space.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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task from the "expired" array'
Revert commit bd53f96ca54a21c07e7a0ae1886fa623d370b85f.
Con says:
This is no good, sorry. The one I saw originally was with the staircase
deadline cpu scheduler in situ and was different.
#define TASK_PREEMPTS_CURR(p, rq) \
((p)->prio < (rq)->curr->prio)
(((p)->prio < (rq)->curr->prio) && ((p)->array == (rq)->active))
This will fail to wake up a runqueue for a task that has been migrated to the
expired array of a runqueue which is otherwise idle which can happen with smp
balancing,
Cc: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Cc: Con Kolivas <kernel@kolivas.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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We have a standard suffix to associate a designation string to a sensor:
_label. Use it instead of _position so that libsensors will catch it.
(This isn't implemented yet, but should be soon.)
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Nicolas Boichat <nicolas@boichat.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Let the applesmc device export its address to userspace. libsensors needs
this to recognize the device and give it a unique ID.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Nicolas Boichat <nicolas@boichat.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Zero-sized allocations are pointless anyway, and the SLUB allocator
complains about them, so stop doing that.
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: Hansjoerg Lipp <hjlipp@web.de>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The recent <linux/pci.h> cleanup uncovered that include/asm-m68k/scatterlist.h
needs to include <linux/types.h>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Miscellaneous fixes to bring FRV up to date:
(1) Copy the new syscall numbers from i386 to asm-frv/unistd.h and fill out
the syscall table in entry.S too.
(2) Mark __frv_uart0 and __frv_uart1 __pminitdata rather than __initdata so
that determine_clocks() can access them when CONFIG_PM=y.
(3) Make arch/frv/mm/elf-fdpic.c include asm/mman.h so that MAP_FIXED is
available (fixes commit 2fd3bebaad9da3b3b99c46a3389099424bf7ee35).
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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/proc/pid/clear_refs is only defined in the CONFIG_MMU case, so make sure we
don't have any references to clear_refs_smap() in generic procfs code.
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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This is to fix unnecessary __meminit definition. These are exported for
kernel modules.
I compiled on ia64/x86-64 with memory hotplug on/off.
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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* master.kernel.org:/pub/scm/linux/kernel/git/herbert/crypto-2.6:
[CRYPTO] cryptomgr: Fix use after free
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By the time kthread_run returns the param may have already been freed
so writing the returned thread_struct pointer to param is wrong.
In fact, we don't need it in param anyway so this patch simply puts it
on the stack.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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* master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6:
[SPARC64]: Optimize fault kprobe handling just like powerpc.
[SPARC]: Wire up utimensat syscall.
[SPARC64]: Fix request_irq() ignored result warnings in PCI controller code.
[SPARC64]: Kill asm-sparc64/pbm.h
[ATYFB]: Fix sparc includes.
[QLA2XXX]: Fix build on sparc.
[SPARC64]: Removal of trivial pci_controller_info uses.
[SPARC64]: Move index info pci_pbm_info.
[SPARC64]: Move {setup,teardown}_msi_irq into pci_pbm_info.
[SPARC64]: Move pci_ops into pci_pbm_info.
[SPARC64] SBUS: Error interrupt registry cleanups.
[SPARC64] PCI: Use root list of pbm's instead of pci_controller_info's
[SPARC64] PCI: Kill PROM_PCIRNG_MAX and PROM_PCIIMAP_MAX.
[SPARC64] PCI: Use common routine to fetch PBM properties.
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And eliminate DIE_GPF while we're at it.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Everything it contains can be hidden in pci_impl.h
Signed-off-by: David S. Miller <davem@davemloft.net>
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No need to use asm/pbm.h here.
Signed-off-by: David S. Miller <davem@davemloft.net>
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We now use pci_device_to_OF_node() to get properties
and of_get_property() returns const pointers.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Do not use IRQF_SHARED, these interrupt numbers should all
be unique.
Also use name strings without spaces in them just like
PCI controller drivers do, for consistency.
Signed-off-by: David S. Miller <davem@davemloft.net>
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The idea is to move more and more things into the pbm,
with the eventual goal of eliminating the pci_controller_info
entirely as there really isn't any need for it.
This stage of the transformations requires some reworking of
the PCI error interrupt handling.
It might be tricky to get rid of the pci_controller_info parenting for
a few reasons:
1) When we get an uncorrectable or correctable error we want
to interrogate the IOMMU and streaming cache of both
PBMs for error status. These errors come from the UPA
front-end which is shared between the two PBM PCI bus
segments.
Historically speaking this is why I choose the datastructure
hierarchy of pci_controller_info-->pci_pbm_info
2) The probing does a portid/devhandle match to look for the
'other' pbm, but this is entirely an artifact and can be
eliminated trivially.
What we could do to solve #1 is to have a "buddy" pointer from one pbm
to another.
Signed-off-by: David S. Miller <davem@davemloft.net>
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They are totally unused.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Namely bus-range and ino-bitmap.
This allows us also to eliminate pci_controller_info's
pci_{first,last}_busno fields as only the pbm ones are
used now.
Signed-off-by: David S. Miller <davem@davemloft.net>
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* master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (58 commits)
[SCSI] zfcp: clear boxed flag on unit reopen.
[SCSI] zfcp: clear adapter failed flag if an fsf request times out.
[SCSI] zfcp: rework request ID management.
[SCSI] zfcp: Fix deadlock between zfcp ERP and SCSI
[SCSI] zfcp: Locking for req_no and req_seq_no
[SCSI] zfcp: print S_ID and D_ID with 3 bytes
[SCSI] ipr: Use PCI-E reset API for new ipr adapter
[SCSI] qla2xxx: Update version number to 8.01.07-k7.
[SCSI] qla2xxx: Add MSI support.
[SCSI] qla2xxx: Correct pci_set_msi() usage semantics.
[SCSI] qla2xxx: Attempt to stop firmware only if it had been previously executed.
[SCSI] qla2xxx: Honor NVRAM port-down-retry-count settings.
[SCSI] qla2xxx: Error-out during probe() if we're unable to complete HBA initialization.
[SCSI] zfcp: Stop system after memory corruption
[SCSI] mesh: cleanup variable usage in interrupt handler
[SCSI] megaraid: replace yield() with cond_resched()
[SCSI] megaraid: fix warnings when CONFIG_PROC_FS=n
[SCSI] aacraid: correct SUN products to README
[SCSI] aacraid: superfluous adapter reset for IBM 8 series ServeRAID controllers
[SCSI] aacraid: kexec fix (reset interrupt handler)
...
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The boxed flag for units was never cleared. This doesn't hurt, but on
ACL updates the error recovery could reopen more units than needed.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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Must clear adapter failed flag if an fsf request times out. This is
necessary because on link down situations the failed flags gets set
but the QDIO queues are still up. Since an adapter reopen will be
skipped if the failed flag is set an adapter_reopen that is issued
on fsf request timeout has no effect if the local link is down.
Might lead to locked up system if the SCSI stack is waiting for abort
completion.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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Simplify request ID management and make sure that frequently used
functions are inlined. Also fix a memory leak in zfcp_adapter_enqueue()
which only gets hit in error handling.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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The SCSI stack requires low level drivers to register and
unregister devices. For zfcp this leads to the situation where
zfcp calls the SCSI stack, the SCSI tries to scan the new device
and the scan SCSI command fails. This would require the zfcp erp,
but the erp thread is already blocked in the register call.
The fix is to make sure that the calls from the ERP thread to
the SCSI stack do not block the ERP thread. In detail:
1) Use a workqueue to avoid blocking of the scsi_scan_target calls.
2) When removing a unit make sure that no scsi_scan_target call is
pending.
3) Replace scsi_flush_work with scsi_target_unblock. This avoids
blocking and has the same result.
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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There is a possible race condition while generating the unique
request ids and sequence numbers. Both might be read at the
same time and have the same value. Fix this by serializing the
access through the queue lock of the adapter: First call
zfcp_fsf_req_sbal_get that acquires the lock, then read and
increment the unique ids.
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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S_ID and D_ID are defined in the FCP spec as 3 byte fields.
Change the output in zfcp print statements accordingly to print
them with only 3 bytes.
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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Use a newly added PCI API to issue a PCI Fundamental reset
(warm reset) to a new ipr PCI-E adapter. Typically, the
ipr adapter uses the start BIST bit in config space to reset
an adapter. Issuing start BIST on this particular adapter
results in the PCI-E logic on the card losing sync, which
causes PCI-E errors, making the card unusable. The only reset
mechanism that exists on this hardware that does not have this
problem is PCI Fundamental reset (warm reset).
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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Supported ISP types include ISP2422 and revision-2 type
ISP2432 chips.
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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executed.
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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Hardcoding the qlport_down_retry module-parameter
effectively disallowed any user-defined NVRAM setting to go
into effect.
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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initialization.
Remove a stale check against ha->device_flags
(DFLG_NO_CABLE) as topology scanning is performed within the
DPC-thread context.
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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For each request that is sent to the FCP adapter, zfcp allocates
memory. Status information and data that is being read from the
device is written to this memory by the hardware. After that,
the hardware signals this via the response queue and zfcp
continues processing.
Now, if zfcp detects that there is a signal for an incoming
response from the hardware, but there is no outstanding request
for that request id, then some memory that can be in use anywhere
in the system has just been overwritten. This should never happen,
but if it does, stop the system with a panic.
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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