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path: root/drivers/ata/libata.h
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* libata: add @timeout to ata_exec_internal[_sg]()Tejun Heo2007-10-12
| | | | | | | | Add @timeout argument to ata_exec_internal[_sg](). If 0, default timeout ata_probe_timeout is used. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-pmp: extend ACPI support to cover PMPTejun Heo2007-10-12
| | | | | | | | | | | | Extend ata_acpi_associate_sata_port() such that it can handle PMP and call it when PMP is attached and detached. Build breakage when !CONFIG_ATA_ACPI was spotted and fixed by Petr Vandrovec. Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Petr Vandrovec <petr@vandrovec.name> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-pmp: hook PMP support and enable itTejun Heo2007-10-12
| | | | | | | | Hook PMP support into libata and enable it. Connect SCR and probing functions, and update ata_dev_classify() to detect PMP. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-pmp: implement Port Multiplier supportTejun Heo2007-10-12
| | | | | | | | | | | | | | | | | | | | | Implement Port Multiplier support. To support PMP, a LLDD has to supply ops->pmp_read() and pmp_write(). If non-null, ->pmp_attach and ->pmp_detach are called on PMP attach and detach, respectively. ->pmp_read/write() can be called while the port is frozen, so they must be implemented by polling. This patch supplies several helpers to ease ->pmp_read/write() implementation. Also, irq_handler and error_handler must be PMP aware. Most of PMP aware EH can be done by calling ata_pmp_do_eh() with appropriate methods. PMP EH uses separate set of reset methods and this patch implements standard prereset, hardreset and postreset methods. This patch only implements PMP support. The next patch will integrate PMP into the reset of libata and thus enable PMP support. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-pmp-prep: implement sata_async_notification()Tejun Heo2007-10-12
| | | | | | | | | | | | | AN serves multiple purposes. For ATAPI, it's used for media change notification. For PMP, for downstream PHY status change notification. Implement sata_async_notification() which demultiplexes AN. To avoid unnecessary port events, ATAPI AN is not enabled if PMP is attached but SNTF is not available. Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Kriten Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-pmp-prep: make a number of functions global to libataTejun Heo2007-10-12
| | | | | | | | Make a number of functions from libata-core.c and libata-eh.c global to libata (drivers/ata/libata.h). These will be used by PMP. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-pmp-prep: add @new_class to ata_dev_revalidate()Tejun Heo2007-10-12
| | | | | | | | | | Consider newly found class code while revalidating. PMP resetting always results in valid class code and issuing PMP commands to ATA/ATAPI device isn't very attractive. Add @new_class to ata_dev_revalidate() and check class code for revalidation. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* [libata] SCSI: simulator version, not device version, belongs in VPDJeff Garzik2007-10-12
| | | | Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: add support for ATA_16 on ATAPIMark Lord2007-10-12
| | | | | | | | | | | | | | Add support for issuing ATA_16 passthru commands to ATAPI devices managed by libata. It requires the previous CDB length fix patch. A boot/module parameter, "atapi_passthru16=0" can be used to globally disable this feature, if ever desired. tj: restructured __ata_scsi_queuecmd() according to Jeff's suggestion. Signed-off-by: Mark Lord <liml@rtr.ca> Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-link: linkify config/EH related functionsTejun Heo2007-10-12
| | | | | | | | | | | | | Make the following functions deal with ata_link instead of ata_port. * ata_set_mode() * ata_eh_autopsy() and related functions * ata_eh_report() and related functions * suspend/resume related functions * ata_eh_recover() and related functions Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-link: linkify PHY-related functionsTejun Heo2007-10-12
| | | | | | | | | | | | | | | | | Make the following PHY-related functions to deal with ata_link instead of ata_port. * sata_print_link_status() * sata_down_spd_limit() * ata_set_sata_spd_limit() and friends * sata_link_debounce/resume() * sata_scr_valid/read/write/write_flush() * ata_link_on/offline() This patch introduces no behavior change. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: implement EH fast drainTejun Heo2007-07-20
| | | | | | | | | | | | | | | | | | | | | | | In most cases, when EH is scheduled, all in-flight commands are aborted causing EH to kick in immediately. However, in some cases (especially with PMP), it's unclear which commands are affected by the error condition and although aborting all in-flight commands work, it isn't optimal and may cause unnecessary disruption. On the other hand, waiting for in-flight commands to drain themselves can take up to 30seconds. This patch implements EH fast drain to handle such situations. It gives in-flight commands some time to finish up but doesn't wait for too long. After EH is scheduled, fast drain timer is started and if no other completion occurs in ATA_EH_FASTDRAIN_INTERVAL all in-flight commands are aborted. If any completion occurred in the interval, the port is given another interval to finish up itself. Currently ATA_EH_FASTDRAIN_INTERVAL is 3 secs which should be enough for finishing up most commands. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: improve SCSI scan failure handlingTejun Heo2007-07-20
| | | | | | | | | | | | | | | | | SCSI scan may fail due to memory allocation failure even if EH is not in progress. Due to use of GFP_ATOMIC in SCSI scan path, allocation failure isn't too rare especially while probing multiple devices at once which is the case when a bunch of devices are connected to PMP. This patch moves SCSI scan failure detetion logic from ata_scsi_hotplug() to ata_scsi_scan_host() and implement synchronous scan behavior. The synchronous path sleeps briefly and repeats SCSI scan if some devices aren't attached properly. It contains robust retry loop to minimize the chance of device misdetection during boot and falls back to async retry if everything fails. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-acpi: implement _GTM/_STM supportTejun Heo2007-07-09
| | | | | | | | | | | | | | | | | Implement _GTM/_STM support. acpi_gtm is added to ata_port which stores _GTM parameters over suspend/resume cycle. A new hook ata_acpi_on_suspend() is responsible for storing _GTM parameters during suspend. _STM is executed in ata_acpi_on_resume(). With this change, invoking _GTF is safe on IDE hierarchy and acpi_sata check before _GTF is removed. ata_acpi_gtm() and ata_acpi_stm() implementation is taken from Alan Cox's pata_acpi implementation. ata_acpi_gtm() is fixed such that the result parameter is not shifted by sizeof(union acpi_object). Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: reimplement ACPI invocationTejun Heo2007-07-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch reimplements ACPI invocation such that, instead of exporting ACPI details to the rest of libata, ACPI event handlers - ata_acpi_on_resume() and ata_acpi_on_devcfg() - are used. These two functions are responsible for determining whether specific ACPI method is used and when. On resume, _GTF is scheduled by setting ATA_DFLAG_ACPI_PENDING device flag. This is done this way to avoid performing the action on wrong device device (device swapping while suspended). On every ata_dev_configure(), ata_acpi_on_devcfg() is called, which performs _SDD and _GTF. _GTF is performed only after resuming and, if SATA, hardreset as the ACPI spec specifies. As _GTF may contain arbitrary commands, IDENTIFY page is re-read after _GTF taskfiles are executed. If one of ACPI methods fails, ata_acpi_on_devcfg() retries on the first failure. If it fails again on the second try, ACPI is disabled on the device. Note that successful configuration clears ACPI failed status. With all feature checks moved to the above two functions, do_drive_set_taskfiles() is trivial and thus collapsed into ata_acpi_exec_tfs(), which is now static and converted to return the number of executed taskfiles to be used by ata_acpi_on_resume(). As failures are handled properly, ata_acpi_push_id() now returns -errno on errors instead of unconditional zero. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-acpi: implement ata_acpi_associate()Tejun Heo2007-07-09
| | | | | | | | | | | | | | | | | | * Add acpi_handle to ata_host and ata_port. Rename ata_device->obj_handle to ->acpi_handle and move it above such that it doesn't get cleared on reconfiguration. * Replace ACPI node association which ata_acpi_associate() which is called once during host initialization. Unlike the previous implementation, ata_acpi_associate() uses ATA_FLAG_ACPI_SATA to choose between IDE or SATA ACPI hierarchy and uses simple child look up instead of recursive walk to match the nodes. This is way safer and simpler. Please read the following message for more info. http://article.gmane.org/gmane.linux.ide/17554 Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: remove libata.spindown_compatTejun Heo2007-05-17
| | | | | | | | | | | With STANDBYDOWN tracking added, libata.spindown_compat isn't necessary anymore. If userspace shutdown(8) issues STANDBYNOW, libata warns. If userspace shutdown(8) doesn't issue STANDBYNOW, libata does the right thing. Userspace can tell whether kernel supports spindown by testing whether sysfs node manage_start_stop exists as before. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: separate out ata_dev_reread_id()Tejun Heo2007-05-16
| | | | | | | | | | Separate out ata_dev_reread_id() from ata_dev_revalidate(). ata_dev_reread_id() reads IDENTIFY page and determines whether the same device is still there. ata_dev_revalidate() reconfigures after reread completes. This will be used by ACPI update. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-acpi: clean up parameters and misc stuffTejun Heo2007-05-11
| | | | | | | | | | | | | This patch cleans up libata-acpi such that it looks similar to other libata files. This patch doesn't introuce any behavior changes. * make libata-acpi functions take ata_device instead of ata_port + device index * s/atadev/dev/ * de-indent local variable declarations Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata-acpi: s/CONFIG_SATA_ACPI/CONFIG_ATA_ACPI/Tejun Heo2007-05-11
| | | | | | | | ACPI applies to both SATA and PATA. Drop the 'S' from the config variable. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: implement libata.spindown_compatTejun Heo2007-05-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that libata uses sd->manage_start_stop, libata spins down disk on shutdown. In an attempt to compensate libata's previous shortcoming, some distros sync and spin down disks attached via libata in their shutdown(8). Some disks spin back up just to spin down again on STANDBYNOW1 if the command is issued when the disk is spun down, so this double spinning down causes problem. This patch implements module parameter libata.spindown_compat which, when set to one (default value), prevents libata from spinning down disks on shutdown thus avoiding double spinning down. Note that libata spins down disks for suspend to mem and disk, so with libata.spindown_compat set to one, disks should be properly spun down in all cases without modifying shutdown(8). shutdown(8) should be fixed eventually. Some drive do spin up on SYNCHRONZE_CACHE even when their cache is clean. Those disks currently spin up briefly when sd tries to shutdown the device and then the machine powers off immediately, which can't be good for the head. We can't skip SYNCHRONIZE_CACHE during shudown as it can be dangerous data integrity-wise. So, this spindown_compat parameter is already scheduled for removal by the end of the next year and here's what shutdown(8) should do. * Check whether /sys/modules/libata/parameters/spindown_compat exists. If it does, write 0 to it. * For each libata harddisk { * Check whether /sys/class/scsi_disk/h:c:i:l/manage_start_stop exists. Iff it doesn't, synchronize cache and spin the disk down as before. } The above procedure will make shutdown(8) work properly with kernels before this change, ones with this workaround and later ones without it. To accelerate shutdown(8) updates, if the compat mode is in use, this patch prints BIG FAT warning for five seconds during shutdown (the optimal interval to annoy the user just the right amount discovered by hours of tireless usability testing). Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: kill probe_ent and related helpersTejun Heo2007-04-28
| | | | | | | | All drivers are converted to new init model. Kill probe_ent, ata_device_add() and ata_pci_init_native_mode(). Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: separate out ata_host_alloc() and ata_host_register()Tejun Heo2007-04-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Reorganize ata_host_alloc() and its subroutines into the following three functions. * ata_host_alloc() : allocates host and its ports. shost is not registered automatically. * ata_scsi_add_hosts() : allocates and adds shosts associated with an ATA host. Used by ata_host_register(). * ata_host_register() : takes a fully initialized ata_host structure and registers it to libata layer and probes it. Only ata_host_alloc() and ata_host_register() are exported. ata_device_add() is rewritten using the above functions. This patch does not introduce any observable behavior change. Things worth mentioning. * print_id is assigned at registration time and LLDs are allowed to overallocate ports and reduce host->n_ports during initialization. ata_host_register() will throw away unused ports automatically. * All SCSI host initialization stuff now resides in ata_scsi_add_hosts() in libata-scsi.c, where it should be. * ipr is now the only user of ata_host_init(). Either kill it by converting ipr to use ata_host_alloc() and friends or rename and move it to libata-scsi.c Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* [libata] Disable ACPI by default; fix namespace problemsJeff Garzik2007-03-28
| | | | | | | | | | Not yet ready to turn on ATA ACPI by default, for either PATA or SATA. Also, rename the global-scope module parameter variable 'noacpi' to something more libata-specific, reducing the potential for namespace collision. Signed-off-by: Jeff Garzik <jeff@garzik.org>
* SiS warning fixesAlan2007-02-21
| | | | | | | | | | | | | Somehow the sis_info133 external definition ended up in libata.h and that was included by both drivers. However libata.h contains libata-* specific internals and clashing defines like DRV_NAME so this makes a mess. Move the extern into the C file and remove the warnings [akpm@linux-foundation.org: create sis.h to avoid extern-decl-in-C] Signed-off-by: Alan Cox <alan@redhat.com> Cc: Jeff Garzik <jeff@garzik.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: kill ATA_DNXFER_ANYTejun Heo2007-02-21
| | | | | | | ATA_DNXFER_ANY isn't used anymore. Kill it. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: improve ata_down_xfermask_limit()Tejun Heo2007-02-21
| | | | | | | | | | | | | | | | | | | | Make ata_down_xfermask_limit() accept @sel instead of @force_pio0. @sel selects how the xfermask limit will be adjusted. The following selectors are defined. * ATA_DNXFER_PIO : only speed down PIO * ATA_DNXFER_DMA : only speed down DMA, don't cause transfer mode change * ATA_DNXFER_40C : apply 40c cable limit * ATA_DNXFER_FORCE_PIO : force PIO * ATA_DNXFER_FORCE_PIO0 : force PIO0 (same as original with @force_pio0 == 1) * ATA_DNXFER_ANY : same as original with @force_pio0 == 0 Currently, only ANY and FORCE_PIO0 are used to maintain the original behavior. Other selectors will be used later to improve EH speed down sequence. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* [PATCH] libata: ACPI _SDD supportKristen Carlson Accardi2007-02-16
| | | | | | | | | | | | _SDD (Set Device Data) is an ACPI method that is used to tell the firmware what the identify data is of the device that is attached to the port. It is an optional method, and it's ok for it to be missing. Because of this, we always return success from the routine that calls this method, even if the execution fails. Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: Jeff Garzik <jeff@garzik.org> (cherry picked from 39aa79e0a1f5f2e28aa341f035940746a98b45b1 commit)
* [PATCH] libata: ACPI and _GTF supportKristen Carlson Accardi2007-02-16
| | | | | | | | | | _GTF is an acpi method that is used to reinitialize the drive. It returns a task file containing ata commands that are sent back to the drive to restore it to boot up defaults. Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: Jeff Garzik <jeff@garzik.org> (cherry picked from 9c69cab24b51a89664f4c0dfaf8a436d32117624 commit)
* [libata] Shuffle DRV_xxx in core and SiS drivers, to kill warningsJeff Garzik2007-02-09
| | | | Signed-off-by: Jeff Garzik <jeff@garzik.org>
* fix CONFIG_SATA_SIS=y compile errorAdrian Bunk2007-02-09
| | | | | | | | | | | | | | | | | Static code shouldn't be used from other modules. drivers/built-in.o: In function `sis_init_one': sata_sis.c:(.text+0x7634cd): undefined reference to `sis_info133' sata_sis.c:(.text+0x7634d6): undefined reference to `sis_info133' While I was at it, I also moved the prototype of this struct to a header file. Signed-off-by: Adrian Bunk <bunk@stusta.de> Cc: Jeff Garzik <jeff@garzik.org> Cc: Tejun Heo <htejun@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* Merge branch 'master' of ↵David Howells2006-12-05
|\ | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 Conflicts: drivers/ata/libata-scsi.c include/linux/libata.h Futher merge of Linus's head and compilation fixups. Signed-Off-By: David Howells <dhowells@redhat.com>
| * [PATCH] libata: always use polling IDENTIFYTejun Heo2006-12-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | libata switched to IRQ-driven IDENTIFY when IRQ-driven PIO was introduced. This has caused a lot of problems including device misdetection and phantom device. ATA_FLAG_DETECT_POLLING was added recently to selectively use polling IDENTIFY on problemetic drivers but many controllers and devices are affected by this problem and trying to adding ATA_FLAG_DETECT_POLLING for each such case is diffcult and not very rewarding. This patch makes libata always use polling IDENTIFY. This is consistent with libata's original behavior and drivers/ide's behavior. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
| * [PATCH] libata: prepare ata_sg_clean() for invocation from EHTejun Heo2006-12-03
| | | | | | | | | | | | Make ata_sg_clean() global and don't allow NCQ for internal commands. Signed-off-by: Tejun Heo <htejun@gmail.com>
| * [PATCH] libata: separate out rw ATA taskfile building into ata_build_rw_tf()Tejun Heo2006-12-03
| | | | | | | | | | | | | | Separate out rw ATA taskfile building from ata_scsi_rw_xlat() into ata_build_rw_tf(). This will be used to improve media error handling. Signed-off-by: Tejun Heo <htejun@gmail.com>
| * [PATCH] libata: implement ata_exec_internal_sg()Tejun Heo2006-12-03
| | | | | | | | | | | | | | | | Sg'ify ata_exec_internal() and call it ata_exec_internal_sg(). Wrapper function around ata_exec_internal_sg() is implemented to provide ata_exec_internal() interface. Signed-off-by: Tejun Heo <htejun@gmail.com>
| * [PATCH] libata: implement ata_tf_read_block()Tejun Heo2006-12-01
| | | | | | | | | | | | | | Implement ata_tf_read_block(). Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
| * [PATCH] libata: implement presence detection via polling IDENTIFYTejun Heo2006-12-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On some controllers (ICHs in piix mode), there is *NO* reliable way to determine device presence other than issuing IDENTIFY and see how the transaction proceeds by watching the TF status register. libata acted this way before irq-pio and phantom devices caused very little problem but now that IDENTIFY is performed using IRQ drive PIO, such phantom devices now result in multiple 30sec timeouts during boot. This patch implements ATA_FLAG_DETECT_POLLING. If a LLD sets this flag, libata core issues the initial IDENTIFY in polling mode and if the initial data transfer fails w/ HSM violation, the port is considered to be empty thus replicating the old libata and IDE behavior. Signed-off-by: Jeff Garzik <jeff@garzik.org>
| * [PATCH] libata: convert @post_reset to @flags in ata_dev_read_id()Tejun Heo2006-12-01
| | | | | | | | | | | | | | | | | | Make ata_dev_read_id() take @flags instead of @post_reset. Currently there is only one flag defined - ATA_READID_POSTRESET, which is equivalent to @post_reset. This is preparation for polling presence detection. Signed-off-by: Jeff Garzik <jeff@garzik.org>
| * [PATCH] libata: implement ATA_EHI_PRINTINFOTejun Heo2006-12-01
| | | | | | | | | | | | | | | | | | | | | | | | | | Implement ehi flag ATA_EHI_PRINTINFO. This flag is set when device configuration needs to print out device info. This used to be handled by @print_info argument to ata_dev_configure() but LLDs also need to know about it in ->dev_config() callback. This patch replaces @print_info w/ ATA_EHI_PRINTINFO and make sata_sil print workaround messages only on the initial configuration. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
| * [PATCH] libata: move ata_irq_on() into libata-sff.cTejun Heo2006-12-01
| | | | | | | | | | | | | | | | | | | | ata_irq_on() isn't used outside of libata core layer. The function is TF/SFF interface specific but currently used by core path with some hack too. Move it from include/linux/libata.h to drivers/ata/libata-sff.c. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* | WorkStruct: Pass the work_struct pointer instead of context dataDavid Howells2006-11-22
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pass the work_struct pointer to the work function rather than context data. The work function can use container_of() to work out the data. For the cases where the container of the work_struct may go away the moment the pending bit is cleared, it is made possible to defer the release of the structure by deferring the clearing of the pending bit. To make this work, an extra flag is introduced into the management side of the work_struct. This governs auto-release of the structure upon execution. Ordinarily, the work queue executor would release the work_struct for further scheduling or deallocation by clearing the pending bit prior to jumping to the work function. This means that, unless the driver makes some guarantee itself that the work_struct won't go away, the work function may not access anything else in the work_struct or its container lest they be deallocated.. This is a problem if the auxiliary data is taken away (as done by the last patch). However, if the pending bit is *not* cleared before jumping to the work function, then the work function *may* access the work_struct and its container with no problems. But then the work function must itself release the work_struct by calling work_release(). In most cases, automatic release is fine, so this is the default. Special initiators exist for the non-auto-release case (ending in _NAR). Signed-Off-By: David Howells <dhowells@redhat.com>
* [PATCH] libata: unexport ata_dev_revalidate()Tejun Heo2006-10-31
| | | | | | | | ata_dev_revalidate() isn't used outside of libata core. Unexport it. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* libata: Grand renaming.Jeff Garzik2006-08-24
| | | | | | | | | | | | | | | | | | | | | | | | The biggest change is that ata_host_set is renamed to ata_host. * ata_host_set => ata_host * ata_probe_ent->host_flags => ata_probe_ent->port_flags * ata_probe_ent->host_set_flags => ata_probe_ent->_host_flags * ata_host_stats => ata_port_stats * ata_port->host => ata_port->scsi_host * ata_port->host_set => ata_port->host * ata_port_info->host_flags => ata_port_info->flags * ata_(.*)host_set(.*)\(\) => ata_\1host\2() The leading underscore in ata_probe_ent->_host_flags is to avoid reusing ->host_flags for different purpose. Currently, the only user of the field is libata-bmdma.c and probe_ent itself is scheduled to be removed. ata_port->host is reused for different purpose but this field is used inside libata core proper and of different type. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* Move libata to drivers/ata.Jeff Garzik2006-08-10
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