- 28 10月, 2011 18 次提交
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由 Andi Kleen 提交于
Add a generic_file_llseek variant to the VFS that allows passing in the maximum file size of the file system, instead of always using maxbytes from the superblock. This can be used to eliminate some cut'n'paste seek code in ext4. Signed-off-by: NAndi Kleen <ak@linux.intel.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Andi Kleen 提交于
The i_mutex lock use of generic _file_llseek hurts. Independent processes accessing the same file synchronize over a single lock, even though they have no need for synchronization at all. Under high utilization this can cause llseek to scale very poorly on larger systems. This patch does some rethinking of the llseek locking model: First the 64bit f_pos is not necessarily atomic without locks on 32bit systems. This can already cause races with read() today. This was discussed on linux-kernel in the past and deemed acceptable. The patch does not change that. Let's look at the different seek variants: SEEK_SET: Doesn't really need any locking. If there's a race one writer wins, the other loses. For 32bit the non atomic update races against read() stay the same. Without a lock they can also happen against write() now. The read() race was deemed acceptable in past discussions, and I think if it's ok for read it's ok for write too. => Don't need a lock. SEEK_END: This behaves like SEEK_SET plus it reads the maximum size too. Reading the maximum size would have the 32bit atomic problem. But luckily we already have a way to read the maximum size without locking (i_size_read), so we can just use that instead. Without i_mutex there is no synchronization with write() anymore, however since the write() update is atomic on 64bit it just behaves like another racy SEEK_SET. On non atomic 32bit it's the same as SEEK_SET. => Don't need a lock, but need to use i_size_read() SEEK_CUR: This has a read-modify-write race window on the same file. One could argue that any application doing unsynchronized seeks on the same file is already broken. But for the sake of not adding a regression here I'm using the file->f_lock to synchronize this. Using this lock is much better than the inode mutex because it doesn't synchronize between processes. => So still need a lock, but can use a f_lock. This patch implements this new scheme in generic_file_llseek. I dropped generic_file_llseek_unlocked and changed all callers. Signed-off-by: NAndi Kleen <ak@linux.intel.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Andi Kleen 提交于
This doesn't change anything for the compiler, but hch thought it would make the code clearer. I moved the reference counting into its own little inline. Signed-off-by: NAndi Kleen <ak@linux.intel.com> Acked-by: NJeff Moyer <jmoyer@redhat.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Andi Kleen 提交于
Add inlines to all the submission path functions. While this increases code size it also gives gcc a lot of optimization opportunities in this critical hotpath. In particular -- together with some other changes -- this allows gcc to get rid of the unnecessary clearing of sdio at the beginning and optimize the messy parameter passing. Any non inlining of a function which takes a sdio parameter would break this optimization because they cannot be done if the address of a structure is taken. Note that benefits are only seen with CONFIG_OPTIMIZE_INLINING and CONFIG_CC_OPTIMIZE_FOR_SIZE both set to off. This gives about 2.2% improvement on a large database benchmark with a high IOPS rate. Signed-off-by: NAndi Kleen <ak@linux.intel.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Andi Kleen 提交于
Only a single b_private field in the map_bh buffer head is needed after the submission path. Move map_bh separately to avoid storing this information in the long term slab. This avoids the weird 104 byte hole in struct dio_submit which also needed to be memseted early. Signed-off-by: NAndi Kleen <ak@linux.intel.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Andi Kleen 提交于
A direct slab call is slightly faster than kmalloc and can be better cached per CPU. It also avoids rounding to the next kmalloc slab. In addition this enforces cache line alignment for struct dio to avoid any false sharing. Signed-off-by: NAndi Kleen <ak@linux.intel.com> Acked-by: NJeff Moyer <jmoyer@redhat.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Andi Kleen 提交于
Fix most problems reported by pahole. There is still a weird 104 byte hole after map_bh. I'm not sure what causes this. Signed-off-by: NAndi Kleen <ak@linux.intel.com> Acked-by: NJeff Moyer <jmoyer@redhat.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Andi Kleen 提交于
There's nothing on the stack, even before my changes. Signed-off-by: NAndi Kleen <ak@linux.intel.com> Acked-by: NJeff Moyer <jmoyer@redhat.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Andi Kleen 提交于
This large, but largely mechanic, patch moves all fields in struct dio that are only used in the submission path into a separate on stack data structure. This has the advantage that the memory is very likely cache hot, which is not guaranteed for memory fresh out of kmalloc. This also gives gcc more optimization potential because it can easier determine that there are no external aliases for these variables. The sdio initialization is a initialization now instead of memset. This allows gcc to break sdio into individual fields and optimize away unnecessary zeroing (after all the functions are inlined) Signed-off-by: NAndi Kleen <ak@linux.intel.com> Acked-by: NJeff Moyer <jmoyer@redhat.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Christoph Hellwig 提交于
We need to move the inode to the end of the list to actually make the spinning prevention explained in the comment above it work. With a plain list_move it will simply stay in place as we're always reclaiming from the head of the list. Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Andreas Gruenbacher 提交于
Acked-by: NJ. Bruce Fields <bfields@redhat.com> Acked-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NAndreas Gruenbacher <agruen@kernel.org> Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Andreas Gruenbacher 提交于
Acked-by: NJ. Bruce Fields <bfields@redhat.com> Acked-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NAndreas Gruenbacher <agruen@kernel.org> Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Aneesh Kumar K.V 提交于
We are going to add more flags and having them in hex format make it simpler Acked-by: NJ. Bruce Fields <bfields@redhat.com> Acked-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Andreas Gruenbacher 提交于
Acked-by: NJ. Bruce Fields <bfields@redhat.com> Acked-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NAndreas Gruenbacher <agruen@kernel.org> Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Eric W. Biederman 提交于
This was found by inspection while tracking a similar bug in compat_statfs64, that has been fixed in mainline since decemeber. - This fixes a bug where not all of the f_spare fields were cleared on mips and s390. - Add the f_flags field to struct compat_statfs - Copy f_flags to userspace in case someone cares. - Use __clear_user to copy the f_spare field to userspace to ensure that all of the elements of f_spare are cleared. On some architectures f_spare is has 5 ints and on some architectures f_spare only has 4 ints. Which makes the previous technique of clearing each int individually broken. I don't expect anyone actually uses the old statfs system call anymore but if they do let them benefit from having the compat and the native version working the same. Signed-off-by: NEric W. Biederman <ebiederm@xmission.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Bryan Schumaker 提交于
nfsiostat was failing to find mounted filesystems on kernels after 2.6.38 because of changes to show_vfsstat() by commit c7f404b4. This patch adds back the "device" tag before the nfs server entry so scripts can parse the mountstats file correctly. Signed-off-by: NBryan Schumaker <bjschuma@netapp.com> CC: stable@kernel.org [>=2.6.39] Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Wang Sheng-Hui 提交于
The patch is aganist 3.1-rc3. Signed-off-by: NWang Sheng-Hui <shhuiw@gmail.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Jeff Layton 提交于
Currently, when you call iov_iter_advance, then the pointer to the iovec array can be incremented, but it does not decrement the nr_segs value in the iov_iter struct. The result is a iov_iter struct with a nr_segs value that goes beyond the end of the array. While I'm not aware of anything that's specifically broken by this, it seems odd and a bit dangerous not to decrement that value. If someone were to trust the nr_segs value to be correct, then they could end up walking off the end of the array. Changing this might also provide some micro-optimization when dealing with the last iovec in an array. Many of the other routines that deal with iov_iter have optimized codepaths when nr_segs == 1. Cc: Nick Piggin <npiggin@suse.de> Signed-off-by: NJeff Layton <jlayton@redhat.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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- 24 10月, 2011 5 次提交
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由 Linus Torvalds 提交于
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git://git.infradead.org/iommu-2.6由 Linus Torvalds 提交于
* git://git.infradead.org/iommu-2.6: intel-iommu: fix superpage support in pfn_to_dma_pte() intel-iommu: set iommu_superpage on VM domains to lowest common denominator intel-iommu: fix return value of iommu_unmap() API MAINTAINERS: Update VT-d entry for drivers/pci -> drivers/iommu move intel-iommu: Export a flag indicating that the IOMMU is used for iGFX. intel-iommu: Workaround IOTLB hang on Ironlake GPU intel-iommu: Fix AB-BA lockdep report
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http://people.redhat.com/agk/git/linux-dm由 Linus Torvalds 提交于
* 'for-linus' of http://people.redhat.com/agk/git/linux-dm: dm kcopyd: fix job_pool leak
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由 Takashi Iwai 提交于
Commit 4b239f45 ("x86-64, mm: Put early page table high") causes a S4 regression since 2.6.39, namely the machine reboots occasionally at S4 resume. It doesn't happen always, overall rate is about 1/20. But, like other bugs, once when this happens, it continues to happen. This patch fixes the problem by essentially reverting the memory assignment in the older way. Signed-off-by: NTakashi Iwai <tiwai@suse.de> Cc: <stable@kernel.org> Cc: Rafael J. Wysocki <rjw@sisk.pl> Cc: Yinghai Lu <yinghai.lu@oracle.com> [ We'll hopefully find the real fix, but that's too late for 3.1 now ] Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Alasdair G Kergon 提交于
Fix memory leak introduced by commit a6e50b40 (dm snapshot: skip reading origin when overwriting complete chunk). When allocating a set of jobs from kc->job_pool, job->master_job must be set (to point to itself) so that the mempool item gets freed when the master_job completes. master_job was introduced by commit c6ea41fb (dm kcopyd: preallocate sub jobs to avoid deadlock) Reported-by: NMichael Leun <ml@newton.leun.net> Cc: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
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- 23 10月, 2011 2 次提交
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git://github.com/kgene/linux-samsung由 Linus Torvalds 提交于
* 'samsung-fixes-4' of git://github.com/kgene/linux-samsung: ARM: S3C24XX: Fix s3c24xx build errors if !CONFIG_PM ARM: S5P: fix offset calculation on gpio-interrupt
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由 Linus Torvalds 提交于
Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging * 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: hwmon: (w83627ehf) Fix negative 8-bit temperature values
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- 22 10月, 2011 1 次提交
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由 Domenico Andreoli 提交于
v2: - register_syscore_ops(&s3c24xx_irq_syscore_ops) does not need to be conditionally compiled out, it is already optimized out on !CONFIG_PM - fix also s3c2412 and s3c2416 affected by the same build issue v1: s3c2440.c fails to build if !CONFIG_PM because in such case s3c2410_pm_syscore_ops is not defined. Same error should happen also in s3c2410.c and s3c2442.c Signed-off-by: NDomenico Andreoli <cavokz@gmail.com> Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>
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- 21 10月, 2011 6 次提交
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git://github.com/herbertx/crypto由 Linus Torvalds 提交于
* git://github.com/herbertx/crypto: crypto: ghash - Avoid null pointer dereference if no key is set
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git://github.com/tiwai/sound由 Linus Torvalds 提交于
* 'fix/hda' of git://github.com/tiwai/sound: ALSA: HDA: conexant support for Lenovo T520/W520 ALSA: hda - Add position_fix quirk for Dell Inspiron 1010
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由 Nick Bowler 提交于
The ghash_update function passes a pointer to gf128mul_4k_lle which will be NULL if ghash_setkey is not called or if the most recent call to ghash_setkey failed to allocate memory. This causes an oops. Fix this up by returning an error code in the null case. This is trivially triggered from unprivileged userspace through the AF_ALG interface by simply writing to the socket without setting a key. The ghash_final function has a similar issue, but triggering it requires a memory allocation failure in ghash_setkey _after_ at least one successful call to ghash_update. BUG: unable to handle kernel NULL pointer dereference at 00000670 IP: [<d88c92d4>] gf128mul_4k_lle+0x23/0x60 [gf128mul] *pde = 00000000 Oops: 0000 [#1] PREEMPT SMP Modules linked in: ghash_generic gf128mul algif_hash af_alg nfs lockd nfs_acl sunrpc bridge ipv6 stp llc Pid: 1502, comm: hashatron Tainted: G W 3.1.0-rc9-00085-ge9308cfd #32 Bochs Bochs EIP: 0060:[<d88c92d4>] EFLAGS: 00000202 CPU: 0 EIP is at gf128mul_4k_lle+0x23/0x60 [gf128mul] EAX: d69db1f0 EBX: d6b8ddac ECX: 00000004 EDX: 00000000 ESI: 00000670 EDI: d6b8ddac EBP: d6b8ddc8 ESP: d6b8dda4 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 Process hashatron (pid: 1502, ti=d6b8c000 task=d6810000 task.ti=d6b8c000) Stack: 00000000 d69db1f0 00000163 00000000 d6b8ddc8 c101a520 d69db1f0 d52aa000 00000ff0 d6b8dde8 d88d310f d6b8a3f8 d52aa000 00001000 d88d502c d6b8ddfc 00001000 d6b8ddf4 c11676ed d69db1e8 d6b8de24 c11679ad d52aa000 00000000 Call Trace: [<c101a520>] ? kmap_atomic_prot+0x37/0xa6 [<d88d310f>] ghash_update+0x85/0xbe [ghash_generic] [<c11676ed>] crypto_shash_update+0x18/0x1b [<c11679ad>] shash_ahash_update+0x22/0x36 [<c11679cc>] shash_async_update+0xb/0xd [<d88ce0ba>] hash_sendpage+0xba/0xf2 [algif_hash] [<c121b24c>] kernel_sendpage+0x39/0x4e [<d88ce000>] ? 0xd88cdfff [<c121b298>] sock_sendpage+0x37/0x3e [<c121b261>] ? kernel_sendpage+0x4e/0x4e [<c10b4dbc>] pipe_to_sendpage+0x56/0x61 [<c10b4e1f>] splice_from_pipe_feed+0x58/0xcd [<c10b4d66>] ? splice_from_pipe_begin+0x10/0x10 [<c10b51f5>] __splice_from_pipe+0x36/0x55 [<c10b4d66>] ? splice_from_pipe_begin+0x10/0x10 [<c10b6383>] splice_from_pipe+0x51/0x64 [<c10b63c2>] ? default_file_splice_write+0x2c/0x2c [<c10b63d5>] generic_splice_sendpage+0x13/0x15 [<c10b4d66>] ? splice_from_pipe_begin+0x10/0x10 [<c10b527f>] do_splice_from+0x5d/0x67 [<c10b6865>] sys_splice+0x2bf/0x363 [<c129373b>] ? sysenter_exit+0xf/0x16 [<c104dc1e>] ? trace_hardirqs_on_caller+0x10e/0x13f [<c129370c>] sysenter_do_call+0x12/0x32 Code: 83 c4 0c 5b 5e 5f c9 c3 55 b9 04 00 00 00 89 e5 57 8d 7d e4 56 53 8d 5d e4 83 ec 18 89 45 e0 89 55 dc 0f b6 70 0f c1 e6 04 01 d6 <f3> a5 be 0f 00 00 00 4e 89 d8 e8 48 ff ff ff 8b 45 e0 89 da 0f EIP: [<d88c92d4>] gf128mul_4k_lle+0x23/0x60 [gf128mul] SS:ESP 0068:d6b8dda4 CR2: 0000000000000670 ---[ end trace 4eaa2a86a8e2da24 ]--- note: hashatron[1502] exited with preempt_count 1 BUG: scheduling while atomic: hashatron/1502/0x10000002 INFO: lockdep is turned off. [...] Signed-off-by: NNick Bowler <nbowler@elliptictech.com> Cc: stable@kernel.org [2.6.37+] Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
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由 Marek Szyprowski 提交于
Offsets of the irq controller registers were calculated correctly only for first GPIO bank. This patch fixes calculation of the register offsets for all GPIO banks. Reported-by: NSylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com> Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc由 Linus Torvalds 提交于
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc: sparc: Add alignment flag to PCI expansion resources sparc: Avoid calling sigprocmask() sparc: Use set_current_blocked() sparc32,leon: SRMMU MMU Table probe fix
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/net由 Linus Torvalds 提交于
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: fib_rules: fix unresolved_rules counting r8169: fix wrong eee setting for rlt8111evl r8169: fix driver shutdown WoL regression. ehea: Change maintainer to me pptp: pptp_rcv_core() misses pskb_may_pull() call tproxy: copy transparent flag when creating a time wait pptp: fix skb leak in pptp_xmit() bonding: use local function pointer of bond->recv_probe in bond_handle_frame smsc911x: Add support for SMSC LAN89218 tg3: negate USE_PHYLIB flag check netconsole: enable netconsole can make net_device refcnt incorrent bluetooth: Properly clone LSM attributes to newly created child connections l2tp: fix a potential skb leak in l2tp_xmit_skb() bridge: fix hang on removal of bridge via netlink x25: Prevent skb overreads when checking call user data x25: Handle undersized/fragmented skbs x25: Validate incoming call user data lengths udplite: fast-path computation of checksum coverage IPVS netns shutdown/startup dead-lock netfilter: nf_conntrack: fix event flooding in GRE protocol tracker
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- 20 10月, 2011 7 次提交
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由 Jean Delvare 提交于
Since 8-bit temperature values are now handled in 16-bit struct members, values have to be cast to s8 for negative temperatures to be properly handled. This is broken since kernel version 2.6.39 (commit bce26c58.) Signed-off-by: NJean Delvare <khali@linux-fr.org> Cc: Guenter Roeck <guenter.roeck@ericsson.com> Cc: stable@kernel.org # 2.6.39+ Signed-off-by: NGuenter Roeck <guenter.roeck@ericsson.com>
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由 Hugh Dickins 提交于
I don't usually pay much attention to the stale "? " addresses in stack backtraces, but this lucky report from Pawel Sikora hints that mremap's move_ptes() has inadequate locking against page migration. 3.0 BUG_ON(!PageLocked(p)) in migration_entry_to_page(): kernel BUG at include/linux/swapops.h:105! RIP: 0010:[<ffffffff81127b76>] [<ffffffff81127b76>] migration_entry_wait+0x156/0x160 [<ffffffff811016a1>] handle_pte_fault+0xae1/0xaf0 [<ffffffff810feee2>] ? __pte_alloc+0x42/0x120 [<ffffffff8112c26b>] ? do_huge_pmd_anonymous_page+0xab/0x310 [<ffffffff81102a31>] handle_mm_fault+0x181/0x310 [<ffffffff81106097>] ? vma_adjust+0x537/0x570 [<ffffffff81424bed>] do_page_fault+0x11d/0x4e0 [<ffffffff81109a05>] ? do_mremap+0x2d5/0x570 [<ffffffff81421d5f>] page_fault+0x1f/0x30 mremap's down_write of mmap_sem, together with i_mmap_mutex or lock, and pagetable locks, were good enough before page migration (with its requirement that every migration entry be found) came in, and enough while migration always held mmap_sem; but not enough nowadays, when there's memory hotremove and compaction. The danger is that move_ptes() lets a migration entry dodge around behind remove_migration_pte()'s back, so it's in the old location when looking at the new, then in the new location when looking at the old. Either mremap's move_ptes() must additionally take anon_vma lock(), or migration's remove_migration_pte() must stop peeking for is_swap_entry() before it takes pagetable lock. Consensus chooses the latter: we prefer to add overhead to migration than to mremapping, which gets used by JVMs and by exec stack setup. Reported-and-tested-by: NPaweł Sikora <pluto@agmk.net> Signed-off-by: NHugh Dickins <hughd@google.com> Acked-by: NAndrea Arcangeli <aarcange@redhat.com> Acked-by: NMel Gorman <mgorman@suse.de> Cc: stable@vger.kernel.org Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Kjetil Oftedal 提交于
Currently no type of alignment is specified for PCI expansion roms while parsing the openfirmware tree. This causes calls to pci_map_rom() to fail. IORESOURCE_SIZEALIGN is the default alignment used for rom resouces in pci/probe.c, and has been verified to work with various cards on a ultra 10. Signed-off-By: NKjetil Oftedal <oftedal@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Yan, Zheng 提交于
we should decrease ops->unresolved_rules when deleting a unresolved rule. Signed-off-by: NZheng Yan <zheng.z.yan@intel.com> Acked-by: NEric Dumazet <eric.dumazet@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 hayeswang 提交于
Correct the wrong parameter for setting EEE for RTL8111E-VL. Signed-off-by: NHayes Wang <hayeswang@realtek.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 françois romieu 提交于
Due to commit 92fc43b4 ("r8169: modify the flow of the hw reset."), rtl8169_hw_reset stomps during driver shutdown on RxConfig bits which are needed for WOL on some versions of the hardware. As these bits were formerly set from the r81{0x, 68}_pll_power_down methods, factor them out for use in the driver shutdown (rtl_shutdown) handler. I favored __rtl8169_get_wol() -hardware state indication- over RTL_FEATURE_WOL as the latter has become a good candidate for removal. Signed-off-by: NFrancois Romieu <romieu@fr.zoreil.com> Cc: Hayes <hayeswang@realtek.com> Tested-by: NMarc Ballarin <ballarin.marc@gmx.de> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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Breno Leitao has passed the maintainership to me. Signed-off-by: NThadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com> Cc: Breno Leitao <leitao@linux.vnet.ibm.com> Acked-by: NBreno Leitão <leitao@linux.vnet.ibm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 19 10月, 2011 1 次提交
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git://linuxtv.org/mchehab/for_linus由 Linus Torvalds 提交于
* 'v4l_for_linus' of git://linuxtv.org/mchehab/for_linus: [media] videodev: fix a NULL pointer dereference in v4l2_device_release()
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