kernel/drivers/ide, branch linux-5.11.y

ide/falconide: Fix module unload

2021-03-04T11:15:16Z

[ Upstream commit 07f1dc8cc85bbfb2f9270f25060c4755f4509f45 ] Unloading the falconide module results in a crash: Unable to handle kernel NULL pointer dereference at virtual address 00000000 Oops: 00000000 Modules linked in: falconide(-) PC: [<002930b2>] ide_host_remove+0x2e/0x1d2 SR: 2000 SP: 00b49e28 a2: 009b0f90 d0: 00000000 d1: 009b0f90 d2: 00000000 d3: 00b48000 d4: 003cef32 d5: 00299188 a0: 0086d000 a1: 0086d000 Process rmmod (pid: 322, task=009b0f90) Frame format=7 eff addr=00000000 ssw=0505 faddr=00000000 wb 1 stat/addr/data: 0000 00000000 00000000 wb 2 stat/addr/data: 0000 00000000 00000000 wb 3 stat/addr/data: 0000 00000000 00018da9 push data: 00000000 00000000 00000000 00000000 Stack from 00b49e90: 004c456a 0027f176 0027cb0a 0027cb9e 00000000 0086d00a 2187d3f0 0027f0e0 00b49ebc 2187d1f6 00000000 00b49ec8 002811e8 0086d000 00b49ef0 0028024c 0086d00a 002800d6 00279a1a 00000001 00000001 0086d00a 2187d3f0 00279a58 00b49f1c 002802e0 0086d00a 2187d3f0 004c456a 0086d00a ef96af74 00000000 2187d3f0 002805d2 800de064 00b49f44 0027f088 2187d3f0 00ac1cf4 2187d3f0 004c43be 2187d3f0 00000000 2187d3f0 800b66a8 00b49f5c 00280776 2187d3f0 Call Trace: [<0027f176>] __device_driver_unlock+0x0/0x48 [<0027cb0a>] device_links_busy+0x0/0x94 [<0027cb9e>] device_links_unbind_consumers+0x0/0x130 [<0027f0e0>] __device_driver_lock+0x0/0x5a [<2187d1f6>] falconide_remove+0x12/0x18 [falconide] [<002811e8>] platform_drv_remove+0x1c/0x28 [<0028024c>] device_release_driver_internal+0x176/0x17c [<002800d6>] device_release_driver_internal+0x0/0x17c [<00279a1a>] get_device+0x0/0x22 [<00279a58>] put_device+0x0/0x18 [<002802e0>] driver_detach+0x56/0x82 [<002805d2>] driver_remove_file+0x0/0x24 [<0027f088>] bus_remove_driver+0x4c/0xa4 [<00280776>] driver_unregister+0x28/0x5a [<00281a00>] platform_driver_unregister+0x12/0x18 [<2187d2a0>] ide_falcon_driver_exit+0x10/0x16 [falconide] [<000764f0>] sys_delete_module+0x110/0x1f2 [<000e83ea>] sys_rename+0x1a/0x1e [<00002e0c>] syscall+0x8/0xc [<00188004>] ext4_multi_mount_protect+0x35a/0x3ce Code: 0029 9188 4bf9 0027 aa1c 283c 003c ef32 <265c> 4a8b 6700 00b8 2043 2028 000c 0280 00ff ff00 6600 0176 40c0 7202 b2b9 004c Disabling lock debugging due to kernel taint This happens because the driver_data pointer is uninitialized. Add the missing platform_set_drvdata() call. For clarity, use the matching platform_get_drvdata() as well. Cc: Michael Schmitz Cc: Bartlomiej Zolnierkiewicz Fixes: 5ed0794cde593 ("m68k/atari: Convert Falcon IDE drivers to platform drivers") Reviewed-by: Geert Uytterhoeven Reviewed-by: Michael Schmitz Signed-off-by: Finn Thain Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin

Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

2021-01-01T20:58:07Z

Pull SCSI fixes from James Bottomley: "This is a load of driver fixes (12 ufs, 1 mpt3sas, 1 cxgbi). The big core two fixes are for power management ("block: Do not accept any requests while suspended" and "block: Fix a race in the runtime power management code") which finally sorts out the resume problems we've occasionally been having. To make the resume fix, there are seven necessary precursors which effectively renames REQ_PREEMPT to REQ_PM, so every "special" request in block is automatically a power management exempt one. All of the non-PM preempt cases are removed except for the one in the SCSI Parallel Interface (spi) domain validation which is a genuine case where we have to run requests at high priority to validate the bus so this becomes an autopm get/put protected request" * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (22 commits) scsi: cxgb4i: Fix TLS dependency scsi: ufs: Un-inline ufshcd_vops_device_reset function scsi: ufs: Re-enable WriteBooster after device reset scsi: ufs-mediatek: Use correct path to fix compile error scsi: mpt3sas: Signedness bug in _base_get_diag_triggers() scsi: block: Do not accept any requests while suspended scsi: block: Remove RQF_PREEMPT and BLK_MQ_REQ_PREEMPT scsi: core: Only process PM requests if rpm_status != RPM_ACTIVE scsi: scsi_transport_spi: Set RQF_PM for domain validation commands scsi: ide: Mark power management requests with RQF_PM instead of RQF_PREEMPT scsi: ide: Do not set the RQF_PREEMPT flag for sense requests scsi: block: Introduce BLK_MQ_REQ_PM scsi: block: Fix a race in the runtime power management code scsi: ufs-pci: Enable UFSHCD_CAP_RPM_AUTOSUSPEND for Intel controllers scsi: ufs-pci: Fix recovery from hibernate exit errors for Intel controllers scsi: ufs-pci: Ensure UFS device is in PowerDown mode for suspend-to-disk ->poweroff() scsi: ufs-pci: Fix restore from S4 for Intel controllers scsi: ufs-mediatek: Keep VCC always-on for specific devices scsi: ufs: Allow regulators being always-on scsi: ufs: Clear UAC for RPMB after ufshcd resets ...

Merge tag 'for-5.11/block-2020-12-14' of git://git.kernel.dk/linux-block

2020-12-16T20:57:51Z

Pull block updates from Jens Axboe: "Another series of killing more code than what is being added, again thanks to Christoph's relentless cleanups and tech debt tackling. This contains: - blk-iocost improvements (Baolin Wang) - part0 iostat fix (Jeffle Xu) - Disable iopoll for split bios (Jeffle Xu) - block tracepoint cleanups (Christoph Hellwig) - Merging of struct block_device and hd_struct (Christoph Hellwig) - Rework/cleanup of how block device sizes are updated (Christoph Hellwig) - Simplification of gendisk lookup and removal of block device aliasing (Christoph Hellwig) - Block device ioctl cleanups (Christoph Hellwig) - Removal of bdget()/blkdev_get() as exported API (Christoph Hellwig) - Disk change rework, avoid ->revalidate_disk() (Christoph Hellwig) - sbitmap improvements (Pavel Begunkov) - Hybrid polling fix (Pavel Begunkov) - bvec iteration improvements (Pavel Begunkov) - Zone revalidation fixes (Damien Le Moal) - blk-throttle limit fix (Yu Kuai) - Various little fixes" * tag 'for-5.11/block-2020-12-14' of git://git.kernel.dk/linux-block: (126 commits) blk-mq: fix msec comment from micro to milli seconds blk-mq: update arg in comment of blk_mq_map_queue blk-mq: add helper allocating tagset->tags Revert "block: Fix a lockdep complaint triggered by request queue flushing" nvme-loop: use blk_mq_hctx_set_fq_lock_class to set loop's lock class blk-mq: add new API of blk_mq_hctx_set_fq_lock_class block: disable iopoll for split bio block: Improve blk_revalidate_disk_zones() checks sbitmap: simplify wrap check sbitmap: replace CAS with atomic and sbitmap: remove swap_lock sbitmap: optimise sbitmap_deferred_clear() blk-mq: skip hybrid polling if iopoll doesn't spin blk-iocost: Factor out the base vrate change into a separate function blk-iocost: Factor out the active iocgs' state check into a separate function blk-iocost: Move the usage ratio calculation to the correct place blk-iocost: Remove unnecessary advance declaration blk-iocost: Fix some typos in comments blktrace: fix up a kerneldoc comment block: remove the request_queue to argument request based tracepoints ...

ide: remove BUG_ON(in_interrupt() || irqs_disabled()) from ide_unregister()

2020-12-15T20:13:36Z

In the discussion about preempt count consistency across kernel configurations: https://lore.kernel.org/r/20200914204209.256266093@linutronix.de/ it was concluded that the usage of in_interrupt() and related context checks should be removed from non-core code. Both BUG_ON()s in ide-probe.c were introduced in commit 4015c949fb465 ("[PATCH] update ide core") when ide_unregister() was extended with semaphore based locking. Both checks won't complain about disabled preemption which is also wrong. The might_sleep() in today's mutex_lock() will complain about the missuses. Remove the BUG_ON() statements. Link: https://lkml.kernel.org/r/20201120092421.1023428-3-bigeasy@linutronix.de Signed-off-by: Sebastian Andrzej Siewior Acked-by: Jens Axboe Cc: "David S. Miller" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ide/falcon: remove in_interrupt() usage

2020-12-15T20:13:36Z

falconide_get_lock() is called by ide_lock_host() and its caller (ide_issue_rq()) has already a might_sleep() check. stdma_lock() has wait_event() which also has a might_sleep() check. Remove the in_interrupt() check. Link: https://lkml.kernel.org/r/20201113161021.2217361-2-bigeasy@linutronix.de Signed-off-by: Sebastian Andrzej Siewior Cc: "David S. Miller" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

scsi: ide: Mark power management requests with RQF_PM instead of RQF_PREEMPT

2020-12-09T16:41:42Z

This is another step that prepares for the removal of RQF_PREEMPT. Link: https://lore.kernel.org/r/20201209052951.16136-5-bvanassche@acm.org Cc: David S. Miller Cc: Alan Stern Cc: Can Guo Cc: Stanley Chu Cc: Ming Lei Cc: Rafael J. Wysocki Reviewed-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Reviewed-by: Jens Axboe Signed-off-by: Bart Van Assche Signed-off-by: Martin K. Petersen

scsi: ide: Do not set the RQF_PREEMPT flag for sense requests

2020-12-09T16:41:42Z

RQF_PREEMPT is used for two different purposes in the legacy IDE code: 1. To mark power management requests. 2. To mark requests that should preempt another request. An (old) explanation of that feature is as follows: "The IDE driver in the Linux kernel normally uses a series of busywait delays during its initialization. When the driver executes these busywaits, the kernel does nothing for the duration of the wait. The time spent in these waits could be used for other initialization activities, if they could be run concurrently with these waits. More specifically, busywait-style delays such as udelay() in module init functions inhibit kernel preemption because the Big Kernel Lock is held, while yielding APIs such as schedule_timeout() allow preemption. This is true because the kernel handles the BKL specially and releases and reacquires it across reschedules allowed by the current thread. This IDE-preempt specification requires that the driver eliminate these busywaits and replace them with a mechanism that allows other work to proceed while the IDE driver is initializing." Since I haven't found an implementation of (2), do not set the PREEMPT flag for sense requests. This patch causes sense requests to be postponed while a drive is suspended instead of being submitted to ide_queue_rq(). If it would ever be necessary to restore the IDE PREEMPT functionality, that can be done by introducing a new flag in struct ide_request. Link: https://lore.kernel.org/r/20201209052951.16136-4-bvanassche@acm.org Cc: David S. Miller Cc: Alan Stern Cc: Can Guo Cc: Stanley Chu Cc: Ming Lei Cc: Rafael J. Wysocki Reviewed-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Reviewed-by: Jens Axboe Signed-off-by: Bart Van Assche Signed-off-by: Martin K. Petersen

ide: switch to __register_blkdev for command set probing

2020-11-16T15:14:30Z

ide is the last user of the blk_register_region framework except for the tracking of allocated gendisk. Switch to __register_blkdev, even if that doesn't allow us to trivially find out which command set to probe for. That means we now always request all modules when a user tries to access an unclaimed ide device node, but except for a few potentially loaded modules for a fringe use case of a deprecated and soon to be removed driver that doesn't make a difference. Signed-off-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe

ide: remove ide_{,un}register_region

2020-11-16T15:14:30Z

There is no need to ever register the fake gendisk used for ide-tape. Signed-off-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe

Merge tag 'block-5.10-2020-10-12' of git://git.kernel.dk/linux-block

2020-10-13T19:12:44Z

Pull block updates from Jens Axboe: - Series of merge handling cleanups (Baolin, Christoph) - Series of blk-throttle fixes and cleanups (Baolin) - Series cleaning up BDI, seperating the block device from the backing_dev_info (Christoph) - Removal of bdget() as a generic API (Christoph) - Removal of blkdev_get() as a generic API (Christoph) - Cleanup of is-partition checks (Christoph) - Series reworking disk revalidation (Christoph) - Series cleaning up bio flags (Christoph) - bio crypt fixes (Eric) - IO stats inflight tweak (Gabriel) - blk-mq tags fixes (Hannes) - Buffer invalidation fixes (Jan) - Allow soft limits for zone append (Johannes) - Shared tag set improvements (John, Kashyap) - Allow IOPRIO_CLASS_RT for CAP_SYS_NICE (Khazhismel) - DM no-wait support (Mike, Konstantin) - Request allocation improvements (Ming) - Allow md/dm/bcache to use IO stat helpers (Song) - Series improving blk-iocost (Tejun) - Various cleanups (Geert, Damien, Danny, Julia, Tetsuo, Tian, Wang, Xianting, Yang, Yufen, yangerkun) * tag 'block-5.10-2020-10-12' of git://git.kernel.dk/linux-block: (191 commits) block: fix uapi blkzoned.h comments blk-mq: move cancel of hctx->run_work to the front of blk_exit_queue blk-mq: get rid of the dead flush handle code path block: get rid of unnecessary local variable block: fix comment and add lockdep assert blk-mq: use helper function to test hw stopped block: use helper function to test queue register block: remove redundant mq check block: invoke blk_mq_exit_sched no matter whether have .exit_sched percpu_ref: don't refer to ref->data if it isn't allocated block: ratelimit handle_bad_sector() message blk-throttle: Re-use the throtl_set_slice_end() blk-throttle: Open code __throtl_de/enqueue_tg() blk-throttle: Move service tree validation out of the throtl_rb_first() blk-throttle: Move the list operation after list validation blk-throttle: Fix IO hang for a corner case blk-throttle: Avoid tracking latency if low limit is invalid blk-throttle: Avoid getting the current time if tg->last_finish_time is 0 blk-throttle: Remove a meaningless parameter for throtl_downgrade_state() block: Remove redundant 'return' statement ...