Alexander Duyck 96e7d7a1e0 dma-debug: update DMA debug API to better handle multiple mappings of a buffer ... There were reports of the igb driver unmapping buffers without calling dma_mapping_error. On closer inspection issues were found in the DMA debug API and how it handled multiple mappings of the same buffer. The issue I found is the fact that the debug_dma_mapping_error would only set the map_err_type to MAP_ERR_CHECKED in the case that the was only one match for device and device address. However in the case of non-IOMMU, multiple addresses existed and as a result it was not setting this field once a second mapping was instantiated. I have resolved this by changing the search so that it instead will now set MAP_ERR_CHECKED on the first buffer that matches the device and DMA address that is currently in the state MAP_ERR_NOT_CHECKED. A secondary side effect of this patch is that in the case of multiple buffers using the same address only the last mapping will have a valid map_err_type. The previous mappings will all end up with map_err_type set to MAP_ERR_CHECKED because of the dma_mapping_error call in debug_dma_map_page. However this behavior may be preferable as it means you will likely only see one real error per multi-mapped buffer, versus the current behavior of multiple false errors mer multi-mapped buffer. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Cc: Joerg Roedel <joro@8bytes.org> Reviewed-by: Shuah Khan <shuah.khan@hp.com> Tested-by: Shuah Khan <shuah.khan@hp.com> Cc: Jakub Kicinski <kubakici@wp.pl> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2013-03-22 16:41:20 -07:00
..
lzo	lib/lzo: Update LZO compression to current upstream version	2013-02-20 19:36:01 +01:00
mpi	mpilib: use DIV_ROUND_UP and remove unused macros	2013-02-01 16:28:32 +11:00
raid6	lib/raid6: build proper files on corresponding arch	2012-12-13 19:51:04 +11:00
reed_solomon	…
xz	decompressors: fix typo "POWERPC"	2013-03-13 15:21:48 -07:00
zlib_deflate	…
zlib_inflate	…
.gitignore	X.509: Implement simple static OID registry	2012-10-08 13:50:18 +10:30
Kconfig	lib: remove depends on CONFIG_EXPERIMENTAL	2013-01-17 12:11:27 -08:00
Kconfig.debug	ImgTec Meta architecture changes for v3.9-rc1	2013-03-03 12:06:09 -08:00
Kconfig.kgdb	KGDB/KDB fixes and cleanups	2013-03-02 08:31:39 -08:00
Kconfig.kmemcheck	…
Makefile	kfifo: move kfifo.c from kernel/ to lib/	2013-02-27 19:10:23 -08:00
argv_split.c	…
asn1_decoder.c	Nothing all that exciting; a new module-from-fd syscall for those who want	2012-12-19 07:55:08 -08:00
atomic64.c	lib: atomic64: Initialize locks statically to fix early users	2012-12-20 13:50:16 -08:00
atomic64_test.c	…
audit.c	…
average.c	…
bcd.c	…
bch.c	…
bitmap.c	propagate name change to comments in kernel source	2012-12-06 10:39:54 +01:00
bitrev.c	…
bsearch.c	…
btree.c	…
bug.c	taint: add explicit flag to show whether lock dep is still OK.	2013-01-21 17:17:57 +10:30
build_OID_registry	X.509: Implement simple static OID registry	2012-10-08 13:50:18 +10:30
bust_spinlocks.c	printk: Provide a wake_up_klogd() off-case	2013-03-22 16:41:20 -07:00
check_signature.c	…
checksum.c	asm-generic headers: Allow yet more arch overrides in checksum.h	2013-02-11 20:00:33 +05:30
clz_tab.c	…
cmdline.c	…
cordic.c	…
cpu-notifier-error-inject.c	…
cpu_rmap.c	lib: cpu_rmap: avoid flushing all workqueues	2013-01-11 14:54:54 -08:00
cpumask.c	bootmem: fix wrong call parameter for free_bootmem()	2012-12-11 17:22:28 -08:00
crc-ccitt.c	…
crc-itu-t.c	…
crc-t10dif.c	…
crc7.c	…
crc8.c	…
crc16.c	…
crc32.c	…
crc32defs.h	…
ctype.c	…
debug_locks.c	…
debugobjects.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
dec_and_lock.c	…
decompress.c	lib/decompress.c add __init to decompress_method and data	2012-10-06 03:05:32 +09:00
decompress_bunzip2.c	…
decompress_inflate.c	…
decompress_unlzma.c	…
decompress_unlzo.c	lib/lzo: Rename lzo1x_decompress.c to lzo1x_decompress_safe.c	2013-02-20 19:36:00 +01:00
decompress_unxz.c	…
devres.c	lib/devres.c: fix misplaced #endif	2013-02-27 19:10:09 -08:00
digsig.c	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2013-02-21 08:18:12 -08:00
div64.c	…
dma-debug.c	dma-debug: update DMA debug API to better handle multiple mappings of a buffer	2013-03-22 16:41:20 -07:00
dump_stack.c	…
dynamic_debug.c	dynamic_debug: add pr_errs before -EINVALs	2013-01-17 12:19:09 -08:00
dynamic_queue_limits.c	…
earlycpio.c	…
extable.c	…
fault-inject.c	…
fdt.c	…
fdt_ro.c	…
fdt_rw.c	…
fdt_strerror.c	…
fdt_sw.c	…
fdt_wip.c	…
find_last_bit.c	…
find_next_bit.c	…
flex_array.c	…
flex_proportions.c	…
gcd.c	lib/gcd.c: prevent possible div by 0	2012-10-06 03:04:57 +09:00
gen_crc32table.c	…
genalloc.c	genalloc: stop crashing the system when destroying a pool	2012-10-25 14:37:52 -07:00
halfmd4.c	…
hexdump.c	dynamic_debug: dynamic hex dump	2013-01-17 12:19:09 -08:00
hweight.c	…
idr.c	idr: idr_alloc() shouldn't trigger lowmem warning when preloaded	2013-03-13 15:21:49 -07:00
inflate.c	…
int_sqrt.c	…
interval_tree.c	mm: interval tree updates	2012-10-09 16:22:40 +09:00
interval_tree_test_main.c	random32: rename random32 to prandom	2012-12-17 17:15:26 -08:00
iomap.c	…
iomap_copy.c	…
iommu-helper.c	…
ioremap.c	…
irq_regs.c	…
is_single_threaded.c	…
jedec_ddr_data.c	…
kasprintf.c	lib/kasprintf.c: use kmalloc_track_caller() to get accurate traces for kvasprintf	2012-10-11 08:50:15 +09:00
kfifo.c	kfifo: fix kfifo_alloc() and kfifo_init()	2013-02-27 19:10:23 -08:00
klist.c	…
kobject.c	…
kobject_uevent.c	…
kstrtox.c	kstrto*: add documentation	2012-12-17 17:15:22 -08:00
kstrtox.h	…
lcm.c	…
libcrc32c.c	…
list_debug.c	…
list_sort.c	…
llist.c	…
locking-selftest-hardirq.h	…
locking-selftest-mutex.h	…
locking-selftest-rlock-hardirq.h	…
locking-selftest-rlock-softirq.h	…
locking-selftest-rlock.h	…
locking-selftest-rsem.h	…
locking-selftest-softirq.h	…
locking-selftest-spin-hardirq.h	…
locking-selftest-spin-softirq.h	…
locking-selftest-spin.h	…
locking-selftest-wlock-hardirq.h	…
locking-selftest-wlock-softirq.h	…
locking-selftest-wlock.h	…
locking-selftest-wsem.h	…
locking-selftest.c	lockdep: Selftest: convert spinlock to raw spinlock	2013-02-19 08:43:35 +01:00
lru_cache.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
md5.c	…
memory-notifier-error-inject.c	…
memweight.c	…
nlattr.c	…
notifier-error-inject.c	…
notifier-error-inject.h	…
of-reconfig-notifier-error-inject.c	powerpc+of: Rename and fix OF reconfig notifier error inject module	2012-12-14 10:32:52 +11:00
oid_registry.c	X.509: Add utility functions to render OIDs as strings	2012-10-08 13:50:18 +10:30
parser.c	lib/parser.c: fix up comments for valid return values from match_number	2013-02-21 17:22:25 -08:00
pci_iomap.c	…
percpu-rwsem.c	percpu_rw_semaphore: add lockdep annotations	2012-12-17 17:15:18 -08:00
percpu_counter.c	…
plist.c	lib/plist.c: make plist test announcements KERN_DEBUG	2012-10-06 03:04:58 +09:00
pm-notifier-error-inject.c	…
prio_heap.c	…
proportions.c	…
radix-tree.c	…
random32.c	prandom: introduce prandom_bytes() and prandom_bytes_state()	2012-12-17 17:15:26 -08:00
ratelimit.c	…
rational.c	…
rbtree.c	lib/rbtree.c: avoid the use of non-static __always_inline	2013-01-11 14:54:56 -08:00
rbtree_test.c	random32: rename random32 to prandom	2012-12-17 17:15:26 -08:00
reciprocal_div.c	…
rwsem-spinlock.c	rwsem-spinlock: Implement writer lock-stealing for better scalability	2013-02-19 08:43:39 +01:00
rwsem.c	rwsem: Implement writer lock-stealing for better scalability	2013-02-19 08:42:43 +01:00
scatterlist.c	lib/scatterlist: use page iterator in the mapping iterator	2013-02-27 19:10:10 -08:00
sha1.c	…
show_mem.c	…
smp_processor_id.c	…
sort.c	…
spinlock_debug.c	lib/spinlock_debug: avoid livelock in do_raw_spin_lock()	2012-10-06 03:04:57 +09:00
stmp_device.c	…
string.c	…
string_helpers.c	…
strncpy_from_user.c	…
strnlen_user.c	…
swiotlb.c	x86: Don't panic if can not alloc buffer for swiotlb	2013-01-29 19:36:53 -08:00
syscall.c	…
test-kstrtox.c	…
textsearch.c	…
timerqueue.c	…
ts_bm.c	…
ts_fsm.c	…
ts_kmp.c	…
uuid.c	…
vsprintf.c	lib/vsprintf.c: add %pa format specifier for phys_addr_t types	2013-02-21 17:22:20 -08:00