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path: root/drivers/misc/mei/client.c
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2014-09-29mei: fix kernel-doc warningsAlexander Usyskin
Add missed parameters descriptions and return values descriptions Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-29mei: fix KDoc documentation formattingAlexander Usyskin
Fix Kdoc documentation formatting warnings genertaed by ./scripts/kernel-doc Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-29mei: trivial: fix errors in prints in commentsAlexander Usyskin
Fix misspellings and wrong print texts Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-29mei: remove include to pci header from mei module filesTomas Winkler
Remove inclusion of linux/pci.h in mei layer however we need to include the headers that before got included implicitly from linux/pci.h. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-29mei: get rid of most of the pci dependencies in meiTomas Winkler
For purpose of adding testing HW we would like to get rid of pci dependency in generic mei code This patch provides only straight forward changes FW status and prob quirks need to be handled separately Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-29mei: fix style warning: Missing a blank line after declarationsTomas Winkler
fix new style warning: Missing a blank line after declarations Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-23mei: revamp connect and disconnect response handlingTomas Winkler
Both responses have same flow only the client status update is different. We introduce handler mei_hbm_cl_res() that handles both responses Also we use per client wait queue (cl->wait) rather then global dev->wait_recvd_msg Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-23mei: use disconnect name consistentlyTomas Winkler
Rename mei_cl_irq_close to mei_cl_irq_disconnect and MEI_FOP_CLOSE to MEI_FOP_DISCONNECT Remove unused MEI_FOP_OPEN Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-23mei: add mei_me_cl_by_uuid_id functionTomas Winkler
When handling dynamic clients there might be a race scenario in which two me clients with the same me address would be linked in the me clients list, therefore we need to search by both uuid and me address. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-23mei: add me client remove functionsTomas Winkler
To support dynamic addition/remove we add wrappers for removal of me clients Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-23mei: use list for me clients book keepingTomas Winkler
To support dynamic addition/remove of clients it is more convenient to use list instead of static array Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-23mei: me_client lookup function to return me_client objectTomas Winkler
For support of dynamic addition and removal of me clients it is more convenient to use a list instead of static array as is use now. As the first step of the transition to the new data structure we change the lookup function so it returns me client address instead of an index. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-23mei: amthif: use service function to flush amthif queueAlexander Usyskin
Replace open coded loop with an existing service function: mei_io_list_flush Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-08-25mei: reset client state on queued connect requestAlexander Usyskin
If connect request is queued (e.g. device in pg) set client state to initializing, thus avoid preliminary exit in wait if current state is disconnected. This is regression from: commit e4d8270e604c3202131bac607969605ac397b893 Author: Alexander Usyskin <alexander.usyskin@intel.com> mei: set connecting state just upon connection request is sent to the fw CC: stable@vger.kernel.org # 3.15+ Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-07-17mei: fix return value on disconnect timeoutAlexander Usyskin
wait_event_timeout can return 0 or the remaining jiffies so return -ETIME if disconnected state not reached. Cc: stable@vger.kernel.org # 3.10+ Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-07-17mei: start disconnect request timer consistentlyAlexander Usyskin
Link must be reset in case the fw doesn't respond to client disconnect request. We did charge the timer only in irq path from mei_cl_irq_close and not in mei_cl_disconnect Cc: stable@vger.kernel.org # 3.10+ Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-07-17mei: reset client connection state on timeoutAlexander Usyskin
On connection timeout we leave the connecting client in connecting state. Since a new connection is stalled till previous connection is completed in this case no new connection is possible till the user space does release the file handle. Therefore on timeout we move the client to disconnected state. Cc: stable@vger.kernel.org # 3.15+ Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-05-03mei: set connecting state just upon connection request is sent to the fwAlexander Usyskin
Adding power gating introduced new waiting state for client also during connection attempt, a connection request can be queued for later either due device is power gated or due to other on going connection. We setting client connection state before start of full connect procedure so in both cased the client state will be MEI_FILE_CONNECTING which create interlock between the two connection attempts, both detecting that another connection is in progress. The interlock is resolved by moving client to connecting state only upon connection request transmission, so the first cb in queue can be processed. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-05-03mei: make return values consistent across the driverAlexander Usyskin
Follow-up for bits missed in commit 7ca96aa278f8b9983184e318b06a0ed9ad0297b8 mei: make return values consistent across the driver Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-05-03mei: use runtime pm in write and read flowTomas Winkler
Take rpm token on operation start to initiate rpm resume if needed. Mark last busy time, release token and advice rpm framework to try to autosuspend on operation end. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-03-17mei: fix memory leak of pending write cb objectsTomas Winkler
Write callbacks are released on the write completed path but when file handler is closed before the writes are completed those are left dangling on write and write_waiting queues. We add mei_io_list_free function to perform this task Also move static functions to client.c form client.h Cc: stable <stable@vger.kernel.org> # 3.11+ Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-28mei: make return values consistent across the driverAlexander Usyskin
1. Propagate ENOTTY to user space if the client is not present in the system 2. Use ETIME consistently on timeouts 3. Return EIO on write failures 4. Return ENODEV on recoverable device failures such as resets Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-28mei: revamp writing slot countingTomas Winkler
Since txe use doorbell and not circular buffer we have to cheat in write slot counting, txe always consume all the slots upon write. In order for it to work we need to track slots using mei_hbuf_empty_slots() instead of tracking it in mei layer Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-28mei: add mei_hbuf_acquire wrapperTomas Winkler
A client has to acquire host buffer before writing, we add lock like wrapper to replace the code snippet if (dev->hbuf_is_ready) dev->hbuf_is_ready = false; Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-19Merge branch 'char-misc-linus' into char-misc-nextGreg Kroah-Hartman
We want the mei change here to allow future mei patches to apply properly. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-18mei: set client's read_cb to NULL when flow control failsChao Bi
In mei_cl_read_start(), if it fails to send flow control request, it will release "cl->read_cb" but forget to set pointer to NULL, leaving "cl->read_cb" still pointing to random memory, next time this client is operated like mei_release(), it has chance to refer to this wrong pointer. Fixes: PANIC at kfree in mei_release() [228781.826904] Call Trace: [228781.829737] [<c16249b8>] ? mei_cl_unlink+0x48/0xa0 [228781.835283] [<c1624487>] mei_io_cb_free+0x17/0x30 [228781.840733] [<c16265d8>] mei_release+0xa8/0x180 [228781.845989] [<c135c610>] ? __fsnotify_parent+0xa0/0xf0 [228781.851925] [<c1325a69>] __fput+0xd9/0x200 [228781.856696] [<c1325b9d>] ____fput+0xd/0x10 [228781.861467] [<c125cae1>] task_work_run+0x81/0xb0 [228781.866821] [<c1242e53>] do_exit+0x283/0xa00 [228781.871786] [<c1a82b36>] ? kprobe_flush_task+0x66/0xc0 [228781.877722] [<c124eeb8>] ? __dequeue_signal+0x18/0x1a0 [228781.883657] [<c124f072>] ? dequeue_signal+0x32/0x190 [228781.889397] [<c1243744>] do_group_exit+0x34/0xa0 [228781.894750] [<c12517b6>] get_signal_to_deliver+0x206/0x610 [228781.901075] [<c12018d8>] do_signal+0x38/0x100 [228781.906136] [<c1626d1c>] ? mei_read+0x42c/0x4e0 [228781.911393] [<c12600a0>] ? wake_up_bit+0x30/0x30 [228781.916745] [<c16268f0>] ? mei_poll+0x120/0x120 [228781.922001] [<c1324be9>] ? vfs_read+0x89/0x160 [228781.927158] [<c16268f0>] ? mei_poll+0x120/0x120 [228781.932414] [<c133ca34>] ? fget_light+0x44/0xe0 [228781.937670] [<c1324e58>] ? SyS_read+0x68/0x80 [228781.942730] [<c12019f5>] do_notify_resume+0x55/0x70 [228781.948376] [<c1a7de5d>] work_notifysig+0x29/0x30 [228781.953827] [<c1a70000>] ? bad_area+0x5/0x3e Cc: stable <stable@vger.kernel.org> # 3.9+ Signed-off-by: Chao Bi <chao.bi@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-18mei: don't of list_for_each_entry_safe when not deletingTomas Winkler
We can use simply list_for_each_entry if there is no entry removal Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-18mei: use helper function to find me client by idAlexander Usyskin
We already have a helper to find me client by id, let's use it in all relevant places. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-18mei: fix potential read outside of array boundsAlexander Usyskin
Drop not-very-useful check and with this fix read on index that can be after array end. Cleanup search function as byproduct. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-18mei: hbm: revamp client connect and disconnection statusAlexander Usyskin
1. Return -ENOTTY on client connect if the requested client was not found on the enumeration list or the client was internally disabled, in the later case FW will return NOT_FOUND. 2. Return -EBUSY if the client cannot be connected because of resource contention 3. Change response status enum to have MEI_CL_ prefix 4. Add function to translate response status to a string for more readable logging Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-18Merge 3.14-rc3 into char-misc-nextGreg Kroah-Hartman
We need the fixes here for future mei and other patches. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-14mei: rename MEI_FOP_IOCTL to MEI_FOP_CONNECTTomas Winkler
This operation actually only support connection and not a generic ioctl Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-07mei: don't unset read cb ptr on resetAlexander Usyskin
Don't set read callback to NULL during reset as this leads to memory leak of both cb and its buffer. The memory is correctly freed during mei_release. The memory leak is detectable by kmemleak if application has open read call while system is going through suspend/resume. unreferenced object 0xecead780 (size 64): comm "AsyncTask #1", pid 1018, jiffies 4294949621 (age 152.440s) hex dump (first 32 bytes): 00 01 10 00 00 02 20 00 00 bf 30 f1 00 00 00 00 ...... ...0..... 00 00 00 00 00 00 00 00 36 01 00 00 00 70 da e2 ........6....p.. backtrace: [<c1a60aec>] kmemleak_alloc+0x3c/0xa0 [<c131ed56>] kmem_cache_alloc_trace+0xc6/0x190 [<c16243c9>] mei_io_cb_init+0x29/0x50 [<c1625722>] mei_cl_read_start+0x102/0x360 [<c16268f3>] mei_read+0x103/0x4e0 [<c1324b09>] vfs_read+0x89/0x160 [<c1324d5f>] SyS_read+0x4f/0x80 [<c1a7b318>] syscall_call+0x7/0xb [<ffffffff>] 0xffffffff unreferenced object 0xe2da7000 (size 512): comm "AsyncTask #1", pid 1018, jiffies 4294949621 (age 152.440s) hex dump (first 32 bytes): 00 6c da e2 7c 00 00 00 00 00 00 00 c0 eb 0c 59 .l..|..........Y 1b 00 00 00 01 00 00 00 02 10 00 00 01 00 00 00 ................ backtrace: [<c1a60aec>] kmemleak_alloc+0x3c/0xa0 [<c131f127>] __kmalloc+0xe7/0x1d0 [<c162447e>] mei_io_cb_alloc_resp_buf+0x2e/0x60 [<c162574c>] mei_cl_read_start+0x12c/0x360 [<c16268f3>] mei_read+0x103/0x4e0 [<c1324b09>] vfs_read+0x89/0x160 [<c1324d5f>] SyS_read+0x4f/0x80 [<c1a7b318>] syscall_call+0x7/0xb [<ffffffff>] 0xffffffff Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-07mei: clear write cb from waiting list on resetAlexander Usyskin
Clear write callbacks sitting in write_waiting list on reset. Otherwise these callbacks are left dangling and cause memory leak. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-01-13mei: limit the number of consecutive resetsTomas Winkler
give up reseting after 3 unsuccessful tries Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-01-08mei: fix syntax in comments and debug outputAlexander Usyskin
Fix syntax errors in comments and debug strings Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-12-18mei: enable marking internal commandsTomas Winkler
Set hbm header bit 30 for internal commands This mark commands that are generated by the device driver Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-11-27mei: drop redundant list_del_initAlexander Usyskin
list_del_init appears twice in row in mei_cl_unlink, drop one. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-29mei: mei_cl_link remove duplicated check for open_handle_countTomas Winkler
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-19mei: move host_clients_map cleanup to device initAlexander Usyskin
Move host_clients_map cleanup from host client init to device init. This fixes bug where we cleaned up the bitmask that servers as pool for host client ids while file descriptors are kept open during suspend. On resume a new connection will be assigned id that is already taken by opened file descriptor. Consequently read/write will fail due to mismatched book keeping. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-03mei: revamp open handler countsTomas Winkler
Make open counter to be incremented and decremented from mei_cl_link and mei_cl_unlik function respectively Nfc was assuming symmetric linking API and thus open handler count was never decreased. This patch fixes that. We need to add separate open hander count for amthif which is handled out of link/unlink functions and doesn't break the symmetric API. Last we do not waste clients slots if amthif or wd are not present in the device. we don't need to allocates slots ahead it is all covered by link/unlink before the devices is responding to user space connection and thus not racing on allocation Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-03mei: simplify mei_open error handlingTomas Winkler
1. Perform simple checks first and only then attempt to allocate cl structure. 2. Remove open_handler_count test, this is already checked in mei_cl_link function 3. return -EMFILE instead of -ENOENT as expected by user space Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26mei: mei_cl_unlink: no need to loop over dev listTomas Winkler
we can call list_del_init regardless the client is linked or not it is always properly initialized Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26mei: push credentials inside the irq write handlerTomas Winkler
this eventually allows as use a single write queue both for control and data messages and removing possible race Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26mei: propagate error from write routines instead of ENODEVTomas Winkler
ENODEV will cause application to try to reconnect since it assumes that device went through the reset write errors are not always fatal it can happen due to resource contention Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26mei: prefix client log messages with client me and host idsAlexander Usyskin
define cl_dbg and cl_err macros that add me and host id prefix for debug and error log messages so we can track for the client context of the flow. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26mei: mei_cl_link protect open_handle_count from overflowTomas Winkler
mei_cl_link is called both from mei_open and also from in-kernel drivers so we need to protect open_handle_count from overflow Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-07-26mei: don't get stuck in select during resetTomas Winkler
Clear pending connection after hw reset but before hw start and wake up the waiting task in poll. Signal POLLERR in select when device went through reset. Add wrapper mei_cl_is_connected for checking if the device and client are connected. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-07-24mei: wake also writers on resetTomas Winkler
wake writers otherwise might have processes waiting endlessly on wait_tx during reset Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-06-24mei: mei_cl_connect: don't multiply the timeout twiceFrode Isaksen
MEI_CL_CONNECT_TIMEOUT is the timeout in seconds to wait for a response in mei_cl_connect. The value was converted to jiffies using mei_secs_to_jiffies helper function and assigned to a local variable which is by mistake again multiplied by HZ Signed-off-by: Frode Isaksen <frodex.isaksen@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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