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2009-06-02UBI: add notification APIDmitry Pervushin
UBI volume notifications are intended to create the API to get clients notified about volume creation/deletion, renaming and re-sizing. A client can subscribe to these notifications using 'ubi_volume_register()' and cancel the subscription using 'ubi_volume_unregister()'. When UBI volumes change, a blocking notifier is called. Clients also can request "added" events on all volumes that existed before client subscribed to the notifications. If we use notifications instead of calling functions like 'ubi_gluebi_xxx()', we can make the MTD emulation layer to be more flexible: build it as a separate module and load/unload it on demand. [Artem: many cleanups, rework locking, add "updated" event, provide device/volume info in notifiers] Signed-off-by: Dmitry Pervushin <dpervushin@embeddedalley.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2009-04-06[MTD] [NAND] Add support for 4KiB pages.Thomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-04-04[MTD] driver model updatesDavid Brownell
Update driver model support in the MTD framework, so it fits better into the current udev-based hotplug framework: - Each mtd_info now has a device node. MTD drivers should set the dev.parent field to point to the physical device, before setting up partitions or otherwise declaring MTDs. - Those device nodes always map to /sys/class/mtdX device nodes, which no longer depend on MTD_CHARDEV. - Those mtdX sysfs nodes have a "starter set" of attributes; it's not yet sufficient to replace /proc/mtd. - Enabling MTD_CHARDEV provides /sys/class/mtdXro/ nodes and the /sys/class/mtd*/dev attributes (for udev, mdev, etc). - Include a MODULE_ALIAS_CHARDEV_MAJOR macro. It'll work with udev creating the /dev/mtd* nodes, not just a static rootfs. So the sysfs structure is pretty much what you'd expect, except that readonly chardev nodes are a bit quirky. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-03-24NOMMU: Present backing device capabilities for MTD chardevsDavid Howells
Present backing device capabilities for MTD character device files to allow NOMMU mmap to do direct mapping where possible. Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Bernd Schmidt <bernd.schmidt@analog.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-03-20[MTD] partitioning utility predicatesDavid Brownell
Move mtd_has_partitions() and mtd_has_cmdlinepart() inlines from a DaVinci-specific driver to the <linux/mtd/partitions.h> header. Use those to eliminate #ifdefs in two drivers which had their own definitions of mtd_has_partitions(). Quite a lot of other MTD drivers could benefit from using use one or both of these to remove #ifdeffery. Maybe some Janitors would like to help. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-01-09Merge git://git.infradead.org/mtd-2.6Linus Torvalds
* git://git.infradead.org/mtd-2.6: (67 commits) [MTD] [MAPS] Fix printk format warning in nettel.c [MTD] [NAND] add cmdline parsing (mtdparts=) support to cafe_nand [MTD] CFI: remove major/minor version check for command set 0x0002 [MTD] [NAND] ndfc driver [MTD] [TESTS] Fix some size_t printk format warnings [MTD] LPDDR Makefile and KConfig [MTD] LPDDR extended physmap driver to support LPDDR flash [MTD] LPDDR added new pfow_base parameter [MTD] LPDDR Command set driver [MTD] LPDDR PFOW definition [MTD] LPDDR QINFO records definitions [MTD] LPDDR qinfo probing. [MTD] [NAND] pxa3xx: convert from ns to clock ticks more accurately [MTD] [NAND] pxa3xx: fix non-page-aligned reads [MTD] [NAND] fix nandsim sched.h references [MTD] [NAND] alauda: use USB API functions rather than constants [MTD] struct device - replace bus_id with dev_name(), dev_set_name() [MTD] fix m25p80 64-bit divisions [MTD] fix dataflash 64-bit divisions [MTD] [NAND] Set the fsl elbc ECCM according the settings in bootloader. ... Fixed up trivial debug conflicts in drivers/mtd/devices/{m25p80.c,mtd_dataflash.c}
2009-01-09[MTD] CFI: remove major/minor version check for command set 0x0002Wolfgang Grandegger
The NOR Flash memory K8P2815UQB from Samsung uses the major version number '0'. Add a quirk to cope with it. Signed-off-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-01-07Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (24 commits) trivial: chack -> check typo fix in main Makefile trivial: Add a space (and a comma) to a printk in 8250 driver trivial: Fix misspelling of "firmware" in docs for ncr53c8xx/sym53c8xx trivial: Fix misspelling of "firmware" in powerpc Makefile trivial: Fix misspelling of "firmware" in usb.c trivial: Fix misspelling of "firmware" in qla1280.c trivial: Fix misspelling of "firmware" in a100u2w.c trivial: Fix misspelling of "firmware" in megaraid.c trivial: Fix misspelling of "firmware" in ql4_mbx.c trivial: Fix misspelling of "firmware" in acpi_memhotplug.c trivial: Fix misspelling of "firmware" in ipw2100.c trivial: Fix misspelling of "firmware" in atmel.c trivial: Fix misspelled firmware in Kconfig trivial: fix an -> a typos in documentation and comments trivial: fix then -> than typos in comments and documentation trivial: update Jesper Juhl CREDITS entry with new email trivial: fix singal -> signal typo trivial: Fix incorrect use of "loose" in event.c trivial: printk: fix indentation of new_text_line declaration trivial: rtc-stk17ta8: fix sparse warning ...
2009-01-06mtd: struct device - replace bus_id with dev_name(), dev_set_name()Kay Sievers
CC: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-01-06trivial: fix then -> than typos in comments and documentationFrederik Schwarzer
- (better, more, bigger ...) then -> (...) than Signed-off-by: Frederik Schwarzer <schwarzerf@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-01-05[MTD] LPDDR extended physmap driver to support LPDDR flashAlexey Korolev
Physmap is a generic map driver for different platforms and flash types. We added support of LPDDR to physmap. All changes here are related to introduction of new pfow_base parameter. This parameter is valid in case of LPDDR chips only. Signed-off-by: Alexey Korolev <akorolev@infradead.org> Acked-by: Jared Hulbert <jaredeh@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-01-05[MTD] LPDDR added new pfow_base parameterAlexey Korolev
We need to supply additional parameter to mapping driver and tell LPDDR drivers where PFOW window is in chip mapping. It leads to necessity of map_info structure extendoing. Signed-off-by: Alexey Korolev <akorolev@infradead.org> Acked-by: Jared Hulbert <jaredeh@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-01-05[MTD] LPDDR PFOW definitionAlexey Korolev
LPDDR chips use PFOW window for sending commands, reading status and capabilites requesting. This pfow.h - contains definitions for PFOW window fileds, possible commands, error flags and some common macro function to avoid code duplications. Signed-off-by: Alexey Korolev <akorolev@infradead.org> Acked-by: Jared Hulbert <jaredeh@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-01-05[MTD] LPDDR QINFO records definitionsAlexey Korolev
There are declaraton of structures and macros definitions necessary for operations with QINFO in this patch. Signed-off-by: Alexey Korolev <akorolev@infradead.org> Acked-by: Jared Hulbert <jaredeh@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-12-23[MTD] struct device - replace bus_id with dev_name(), dev_set_name()Kay Sievers
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-12-10[MTD] [NAND] remove excess kernel-doc notationRandy Dunlap
Delete extra kernel-doc notation for struct fields and function parameters that don't exist: Warning(include/linux/mtd/nand.h:428): Excess struct/union/enum/typedef member 'wq' description in 'nand_chip' Warning(include/linux/mtd/nand.h:428): Excess struct/union/enum/typedef member 'datbuf' description in 'nand_chip' Warning(include/linux/mtd/nand.h:428): Excess struct/union/enum/typedef member 'oobbuf' description in 'nand_chip' Warning(include/linux/mtd/nand.h:428): Excess struct/union/enum/typedef member 'oobdirty' description in 'nand_chip' Warning(include/linux/mtd/nand.h:428): Excess struct/union/enum/typedef member 'data_poi' description in 'nand_chip' Warning(drivers/mtd/nand/nand_base.c:2527): Excess function parameter 'maxchips' description in 'nand_scan_tail' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-12-10Merge branch 'misc/mtd/sharpsl-nand' of ↵David Woodhouse
git://git.kernel.org/pub/scm/linux/kernel/git/lumag/tosa-2.6
2008-12-10[MTD] Remove more strange u_intxx_t typesDavid Woodhouse
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-12-10[MTD] Remove strange u_int32_t types from FTLDavid Woodhouse
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-12-10[MTD] update internal API to support 64-bit device sizeAdrian Hunter
MTD internal API presently uses 32-bit values to represent device size. This patch updates them to 64-bits but leaves the external API unchanged. Extending the external API is a separate issue for several reasons. First, no one needs it at the moment. Secondly, whether the implementation is done with IOCTLs, sysfs or both is still debated. Thirdly external API changes require the internal API to be accepted first. Note that although the MTD API will be able to support 64-bit device sizes, existing drivers do not and are not required to do so, although NAND base has been updated. In general, changing from 32-bit to 64-bit values cause little or no changes to the majority of the code with the following exceptions: - printk message formats - division and modulus of 64-bit values - NAND base support - 32-bit local variables used by mtdpart and mtdconcat - naughtily assuming one structure maps to another in MEMERASE ioctl Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-11-05[MTD] [NOR] Fix cfi_send_gen_cmd handling of x16 devices in x8 mode (v4)Eric W. Biederman
For "unlock" cycles to 16bit devices in 8bit compatibility mode we need to use the byte addresses 0xaaa and 0x555. These effectively match the word address 0x555 and 0x2aa, except the latter has its low bit set. Most chips don't care about the value of the 'A-1' pin in x8 mode, but some -- like the ST M29W320D -- do. So we need to be careful to set it where appropriate. cfi_send_gen_cmd is only ever passed addresses where the low byte is 0x00, 0x55 or 0xaa. Of those, only addresses ending 0xaa are affected by this patch, by masking in the extra low bit when the device is known to be in compatibility mode. [dwmw2: Do it only when (cmd_ofs & 0xff) == 0xaa] v4: Fix stupid typo in cfi_build_cmd_addr that failed to compile I'm writing this patch way to late at night. v3: Bring all of the work back into cfi_build_cmd_addr including calling of map_bankwidth(map) and cfi_interleave(cfi) So every caller doesn't need to. v2: Only modified the address if we our device_type is larger than our bus width. Cc: stable@kernel.org Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-10-29[MTD] sharpsl-nand: use platform_data for model-specific valuesDmitry Baryshkov
Add platform_data which holds all model-specific values, like badblocks pattern, oobinfo, partitions. Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
2008-10-20Merge git://git.infradead.org/mtd-2.6Linus Torvalds
* git://git.infradead.org/mtd-2.6: (69 commits) Revert "[MTD] m25p80.c code cleanup" [MTD] [NAND] GPIO driver depends on ARM... for now. [MTD] [NAND] sh_flctl: fix compile error [MTD] [NOR] AT49BV6416 has swapped erase regions [MTD] [NAND] GPIO NAND flash driver [MTD] cmdlineparts documentation change - explain where mtd-id comes from [MTD] cfi_cmdset_0002.c: Add Macronix CFI V1.0 TopBottom detection [MTD] [NAND] Fix compilation warnings in drivers/mtd/nand/cs553x_nand.c [JFFS2] Write buffer offset adjustment for NOR-ECC (Sibley) flash [MTD] mtdoops: Fix a bug where block may not be erased [MTD] mtdoops: Add a magic number to logged kernel oops [MTD] mtdoops: Fix an off by one error [JFFS2] Correct parameter names of jffs2_compress() in comments [MTD] [NAND] sh_flctl: add support for Renesas SuperH FLCTL [MTD] [NAND] Bug on atmel_nand HW ECC : OOB info not correctly written [MTD] [MAPS] Remove unused variable after ROM API cleanup. [MTD] m25p80.c extended jedec support (v2) [MTD] remove unused mtd parameter in of_mtd_parse_partitions() [MTD] [NAND] remove dead Kconfig associated with !CONFIG_PPC_MERGE [MTD] [NAND] driver extension to support NAND on TQM85xx modules ...
2008-10-18[MTD] [NAND] GPIO NAND flash driverMike Rapoport
The patch adds support for NAND flashes connected to GPIOs. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Mike Rapoport <mike@compulab.co.il> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-10-14[MTD] [NAND] sh_flctl: add support for Renesas SuperH FLCTLYoshihiro Shimoda
Several Renesas SuperH CPU has FLCTL. The FLCTL support NAND Flash. This driver support SH7723. Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-10-13[MTD] remove unused mtd parameter in of_mtd_parse_partitions()Sebastian Andrzej Siewior
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-10-09Support 'discard sectors' operation in translation layer support coreDavid Woodhouse
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-08-20[MTD] [NAND] Fix missing kernel-docAlexey Korolev
[Reported by Randy Dunlap] Signed-off-by: Alexey Korolev <akorolev@infradead.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-08-12[MTD] Define and use MTD_FAIL_ADDR_UNKNOWN instead of 0xffffffffAdrian Hunter
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-08-07[MTD] [NOR] Rename and export new cfi_qry_*() functionsDavid Woodhouse
They need to be exported, so let's give them less generic-sounding names while we're at it. Original export patch, along with the suggestion about the nomenclature, from Stephen Rothwell. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-08-06[MTD] [NOR] cfi_cmdset_0001: Timeouts for erase, write and unlock operationsAnders Grafström
Timeouts are currently given by the typical operation time times 8. It works in the general well-behaved case but not when an erase block is failing. For erase operations, it seems that a failing erase block will keep the device state machine in erasing state until the vendor specified maximum timeout period has passed. By this time the driver would have long since timed out, left erasing state and attempted further operations which all fail. This patch implements timeouts using values from the CFI Query structure when available. The patch also sets a longer timeout for locking operations. The current value used for locking/unlocking given by 1000000/HZ microseconds is too short for devices like J3 and J5 Strataflash which have a typical clear lock-bits time of 0.5 seconds. Signed-off-by: Anders Grafström <grfstrm@users.sourceforge.net> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-08-06[MTD] [NOR] Add qry_mode_on()/qry_omde_off() to deal with odd chipsAlexey Korolev
There are some CFI chips which require non standard procedures to get into QRY mode. The possible way to support them would be trying different modes till QRY will be read. This patch introduce two new functions qry_mode_on qry_mode_off. qry_mode_on tries different commands in order switch chip into QRY mode. So if we have one more "odd" chip - we just could add several lines to qry_mode_on. Also using these functions remove unnecessary code duplicaton in porbe procedure. Currently there are two "odd" cases 1. Some old intel chips which require 0xFF before 0x98 2. ST M29DW chip which requires 0x98 to be sent at 0x555 (according to CFI should be 0x55) This patch is partialy based on the patch from Uwe (see "[PATCH 2/4] [RFC][MTD] cfi_probe: remove Intel chip workaround" thread ) Signed-off-by: Alexey Korolev <akorolev@infradead.org> Signed-off-by: Alexander Belyakov <abelyako@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-08-01[MTD] [OneNAND] Add defines for HF and sync writeAdrian Hunter
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-07-30[MTD] MTD_DEBUG always does compile-time typechecksDavid Brownell
The current style for debug messages is to ensure they're always parsed by the compiler and then subjected to dead code removal. That way builds won't break only when debug options get enabled, which is common when they are stripped out early by CPP. This patch makes CONFIG_MTD_DEBUG adopt that convention. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-07-30[MTD] [NAND] fix subpage read for small page NANDAlexey Korolev
Current implementation of subpage read feature for NAND has issues with small page devices. Small page NAND do not support RNDOUT command. So subpage feature is not applicable for them. This patch disables support of subpage for small page NAND. The code is verified on nandsim(SP NAND simulation) and on LP NAND devices. Thanks a lot to Artem for finding this issue. Signed-off-by: Alexey Korolev <akorolev@infradead.org> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-07-25[MTD] [NAND] subpage read feature as a way to increase performance. Alexey Korolev
This patch enables NAND subpage read functionality. If upper layer drivers are requesting to read non page aligned data NAND subpage-read functionality reads the only whose ECC regions which include requested data when original code reads whole page. This significantly improves performance in many cases. Here are some digits : UBI volume mount time No subpage reads: 5.75 seconds Subpage read patch: 2.42 seconds Open/stat time for files on JFFS2 volume: No subpage read 0m 5.36s Subpage read 0m 2.88s Signed-off-by Alexey Korolev <akorolev@infradead.org> Acked-by: Artem Bityutskiy <dedekind@infradead.org> Acked-by: Jörn Engel <joern@logfs.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2008-07-25Merge branch 'linux-next' of git://git.infradead.org/~dedekind/ubi-2.6David Woodhouse
2008-07-24UBI: amend commentariesArtem Bityutskiy
Hch asked not to use "unit" for sub-systems, let it be so. Also some other commentaries modifications. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2008-07-24UBI: add ubi_sync() interfaceArtem Bityutskiy
To flush MTD device caches. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2008-07-21MTD: handle pci_name() being constGreg Kroah-Hartman
This changes the MTD core to handle pci_name() now returning a constant string. Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-07-11Merge branch 'master' of ↵David Woodhouse
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
2008-06-06Fix various old email addresses for dwmw2David Woodhouse
Although if people have questions about ARCnet, perhaps it's _better_ for them to be mailing dwmw2@cam.ac.uk about it... Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-06-04MTD/JFFS2: remove CVS keywordsAdrian Bunk
Once upon a time, the MTD repository was using CVS. This patch therefore removes all usages of the no longer updated CVS keywords from the MTD code. This also includes code that printed them to the user. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2008-05-01[MTD][NOR] Add physical address to point() methodJared Hulbert
Adding the ability to get a physical address from point() in addition to virtual address. This physical address is required for XIP of userspace code from flash. Signed-off-by: Jared Hulbert <jaredeh@gmail.com> Reviewed-by: Jörn Engel <joern@logfs.org> Acked-by: Nicolas Pitre <nico@cam.org> Acked-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2008-04-26[MTD] Delete long-unused jedec.h header file.Robert P. J. Day
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2008-04-22[MTD] [MAPS] Extend plat-ram to support a supplied probe typeFlorian Fainelli
This enhances plat-ram to take a map_probes argument in the platform_data structure which allow plat-ram to support any direct-mapped device that MTD supports (jedec, cfi, amd ..) A few items are also fixed: - Don't panic if probes is 0 - Actually use the partition list that is passed in Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu> Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2008-04-22[MTD] [OneNAND] proper onenand_bbt_read_oob() prototypeAdrian Bunk
This patch adds a proper prototype for onenand_bbt_read_oob() in include/linux/mtd/onenand.h Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2008-04-22[MTD] proper prototypes for nftl_{read,write}_oob()Adrian Bunk
This patch adds proper prototypes for nftl_{read,write}_oob() in include/linux/mtd/nftl.h Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2008-04-22[MTD] proper prototypes for inftl_{read,write}_oob()Adrian Bunk
This patch adds proper prototypes for inftl_{read,write}_oob() in include/linux/mtd/inftl.h Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2008-02-07[MTD] Add mtd panic_write function pointerRichard Purdie
MTDs are well suited for logging critical data and the mtdoops driver allows kernel panics/oops to be written to flash in a blackbox flight recorder fashion allowing better debugging and analysis of crashes. Any kernel oops in user context can be easily handled since the kernel continues as normal and any queued mtd writes are scheduled. Any kernel oops in interrupt context results in a panic and the delayed writes will not be scheduled however. The existing mtd->write function cannot be called in interrupt context so these messages can never be written to flash. This patch adds a panic_write function pointer that drivers can optionally implement which can be called in interrupt context. It is only intended to be called when its known the kernel is about to panic and we need to write to succeed. Since the kernel is not going to be running for much longer, this function can break locks and delay to ensure the write succeeds (but not sleep). Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: David Woodhouse <dwmw2@infradead.org>