1. 27 8月, 2015 7 次提交
  2. 26 8月, 2015 6 次提交
  3. 13 8月, 2015 10 次提交
  4. 31 7月, 2015 11 次提交
  5. 16 7月, 2015 2 次提交
    • J
      scsi: fix host max depth checking for the 'queue_depth' sysfs interface · 1278dd68
      Jens Axboe 提交于
      Commit 1e6f2416 changed the scsi sysfs 'queue_depth' code to
      rejects depths higher than the scsi host template setting. But lots
      of hosts set this to 1, and update the settings in the scsi host
      when the controller/devices probing happens.
      
      This breaks (at least) mpt2sas and mpt3sas runtime setting of queue
      depth, returning EINVAL for all settings but '1'. And once it's set to
      1, there's no way to go back up.
      
      Cc: stable@vger.kernel.org
      Fixes: 1e6f2416 "scsi: don't allow setting of queue_depth bigger than can_queue"
      Signed-off-by: NJens Axboe <axboe@fb.com>
      Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
      Reviewed-by: NChristoph Hellwig <hch@lst.de>
      Signed-off-by: NJames Bottomley <JBottomley@Odin.com>
      1278dd68
    • S
      st: null pointer dereference panic caused by use after kref_put by st_open · e7ac6c66
      Seymour, Shane M 提交于
      Two SLES11 SP3 servers encountered similar crashes simultaneously
      following some kind of SAN/tape target issue:
      
      ...
      qla2xxx [0000:81:00.0]-801c:3: Abort command issued nexus=3:0:2 --  1 2002.
      qla2xxx [0000:81:00.0]-801c:3: Abort command issued nexus=3:0:2 --  1 2002.
      qla2xxx [0000:81:00.0]-8009:3: DEVICE RESET ISSUED nexus=3:0:2 cmd=ffff882f89c2c7c0.
      qla2xxx [0000:81:00.0]-800c:3: do_reset failed for cmd=ffff882f89c2c7c0.
      qla2xxx [0000:81:00.0]-800f:3: DEVICE RESET FAILED: Task management failed nexus=3:0:2 cmd=ffff882f89c2c7c0.
      qla2xxx [0000:81:00.0]-8009:3: TARGET RESET ISSUED nexus=3:0:2 cmd=ffff882f89c2c7c0.
      qla2xxx [0000:81:00.0]-800c:3: do_reset failed for cmd=ffff882f89c2c7c0.
      qla2xxx [0000:81:00.0]-800f:3: TARGET RESET FAILED: Task management failed nexus=3:0:2 cmd=ffff882f89c2c7c0.
      qla2xxx [0000:81:00.0]-8012:3: BUS RESET ISSUED nexus=3:0:2.
      qla2xxx [0000:81:00.0]-802b:3: BUS RESET SUCCEEDED nexus=3:0:2.
      qla2xxx [0000:81:00.0]-505f:3: Link is operational (8 Gbps).
      qla2xxx [0000:81:00.0]-8018:3: ADAPTER RESET ISSUED nexus=3:0:2.
      qla2xxx [0000:81:00.0]-00af:3: Performing ISP error recovery - ha=ffff88bf04d18000.
       rport-3:0-0: blocked FC remote port time out: removing target and saving binding
      qla2xxx [0000:81:00.0]-505f:3: Link is operational (8 Gbps).
      qla2xxx [0000:81:00.0]-8017:3: ADAPTER RESET SUCCEEDED nexus=3:0:2.
       rport-2:0-0: blocked FC remote port time out: removing target and saving binding
      sg_rq_end_io: device detached
      BUG: unable to handle kernel NULL pointer dereference at 00000000000002a8
      IP: [<ffffffff8133b268>] __pm_runtime_idle+0x28/0x90
      PGD 7e6586f067 PUD 7e5af06067 PMD 0 [1739975.390354] Oops: 0002 [#1] SMP
      CPU 0
      ...
      Supported: No, Proprietary modules are loaded [1739975.390463]
      Pid: 27965, comm: ABCD Tainted: PF           X 3.0.101-0.29-default #1 HP ProLiant DL580 Gen8
      RIP: 0010:[<ffffffff8133b268>]  [<ffffffff8133b268>] __pm_runtime_idle+0x28/0x90
      RSP: 0018:ffff8839dc1e7c68  EFLAGS: 00010202
      RAX: 0000000000000000 RBX: ffff883f0592fc00 RCX: 0000000000000090
      RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000138
      RBP: 0000000000000138 R08: 0000000000000010 R09: ffffffff81bd39d0
      R10: 00000000000009c0 R11: ffffffff81025790 R12: 0000000000000001
      R13: ffff883022212b80 R14: 0000000000000004 R15: ffff883022212b80
      FS:  00007f8e54560720(0000) GS:ffff88407f800000(0000) knlGS:0000000000000000
      CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
      CR2: 00000000000002a8 CR3: 0000007e6ced6000 CR4: 00000000001407f0
      DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
      Process ABCD (pid: 27965, threadinfo ffff8839dc1e6000, task ffff883592e0c640)
      Stack:
       ffff883f0592fc00 00000000fffffffa 0000000000000001 ffff883022212b80
       ffff883eff772400 ffffffffa03fa309 0000000000000000 0000000000000000
       ffffffffa04003a0 ffff883f063196c0 ffff887f0379a930 ffffffff8115ea1e
      Call Trace:
       [<ffffffffa03fa309>] st_open+0x129/0x240 [st]
       [<ffffffff8115ea1e>] chrdev_open+0x13e/0x200
       [<ffffffff811588a8>] __dentry_open+0x198/0x310
       [<ffffffff81167d74>] do_last+0x1f4/0x800
       [<ffffffff81168fe9>] path_openat+0xd9/0x420
       [<ffffffff8116946c>] do_filp_open+0x4c/0xc0
       [<ffffffff8115a00f>] do_sys_open+0x17f/0x250
       [<ffffffff81468d92>] system_call_fastpath+0x16/0x1b
       [<00007f8e4f617fd0>] 0x7f8e4f617fcf
      Code: eb d3 90 48 83 ec 28 40 f6 c6 04 48 89 6c 24 08 4c 89 74 24 20 48 89 fd 48 89 1c 24 4c 89 64 24 10 41 89 f6 4c 89 6c 24 18 74 11 <f0> ff 8f 70 01 00 00 0f 94 c0 45 31 ed 84 c0 74 2b 4c 8d a5 a0
      RIP  [<ffffffff8133b268>] __pm_runtime_idle+0x28/0x90
       RSP <ffff8839dc1e7c68>
      CR2: 00000000000002a8
      
      Analysis reveals the cause of the crash to be due to STp->device
      being NULL. The pointer was NULLed via scsi_tape_put(STp) when it
      calls scsi_tape_release(). In st_open() we jump to err_out after
      scsi_block_when_processing_errors() completes and returns the
      device as offline (sdev_state was SDEV_DEL):
      
      1180 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host
      1181    module count. */
      1182 static int st_open(struct inode *inode, struct file *filp)
      1183 {
      1184         int i, retval = (-EIO);
      1185         int resumed = 0;
      1186         struct scsi_tape *STp;
      1187         struct st_partstat *STps;
      1188         int dev = TAPE_NR(inode);
      1189         char *name;
      ...
      1217         if (scsi_autopm_get_device(STp->device) < 0) {
      1218                 retval = -EIO;
      1219                 goto err_out;
      1220         }
      1221         resumed = 1;
      1222         if (!scsi_block_when_processing_errors(STp->device)) {
      1223                 retval = (-ENXIO);
      1224                 goto err_out;
      1225         }
      ...
      1264  err_out:
      1265         normalize_buffer(STp->buffer);
      1266         spin_lock(&st_use_lock);
      1267         STp->in_use = 0;
      1268         spin_unlock(&st_use_lock);
      1269         scsi_tape_put(STp); <-- STp->device = 0 after this
      1270         if (resumed)
      1271                 scsi_autopm_put_device(STp->device);
      1272         return retval;
      
      The ref count for the struct scsi_tape had already been reduced
      to 1 when the .remove method of the st module had been called.
      The kref_put() in scsi_tape_put() caused scsi_tape_release()
      to be called:
      
      0266 static void scsi_tape_put(struct scsi_tape *STp)
      0267 {
      0268         struct scsi_device *sdev = STp->device;
      0269
      0270         mutex_lock(&st_ref_mutex);
      0271         kref_put(&STp->kref, scsi_tape_release); <-- calls this
      0272         scsi_device_put(sdev);
      0273         mutex_unlock(&st_ref_mutex);
      0274 }
      
      In scsi_tape_release() the struct scsi_device in the struct
      scsi_tape gets set to NULL:
      
      4273 static void scsi_tape_release(struct kref *kref)
      4274 {
      4275         struct scsi_tape *tpnt = to_scsi_tape(kref);
      4276         struct gendisk *disk = tpnt->disk;
      4277
      4278         tpnt->device = NULL; <<<---- where the dev is nulled
      4279
      4280         if (tpnt->buffer) {
      4281                 normalize_buffer(tpnt->buffer);
      4282                 kfree(tpnt->buffer->reserved_pages);
      4283                 kfree(tpnt->buffer);
      4284         }
      4285
      4286         disk->private_data = NULL;
      4287         put_disk(disk);
      4288         kfree(tpnt);
      4289         return;
      4290 }
      
      Although the problem was reported on SLES11.3 the problem appears
      in linux-next as well.
      
      The crash is fixed by reordering the code so we no longer access
      the struct scsi_tape after the kref_put() is done on it in st_open().
      Signed-off-by: NShane Seymour <shane.seymour@hp.com>
      Signed-off-by: NDarren Lavender <darren.lavender@hp.com>
      Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.com>
      Acked-by: NKai Mäkisara <kai.makisara@kolumbus.fi>
      Cc: stable@vger.kernel.org
      Signed-off-by: NJames Bottomley <JBottomley@Odin.com>
      e7ac6c66
  6. 13 7月, 2015 4 次提交
    • L
      Linux 4.2-rc2 · bc0195aa
      Linus Torvalds 提交于
      bc0195aa
    • L
      Revert "drm/i915: Use crtc_state->active in primary check_plane func" · 01e2d062
      Linus Torvalds 提交于
      This reverts commit dec4f799.
      
      Jörg Otte reports a NULL pointder dereference due to this commit, as
      'crtc_state' very much can be NULL:
      
              crtc_state = state->base.state ?
                      intel_atomic_get_crtc_state(state->base.state, intel_crtc) : NULL;
      
      So the change to test 'crtc_state->base.active' cannot possibly be
      correct as-is.
      
      There may be some other minimal fix (like just checking crtc_state for
      NULL), but I'm just reverting it now for the rc2 release, and people
      like Daniel Vetter who actually know this code will figure out what the
      right solution is in the longer term.
      Reported-and-bisected-by: NJörg Otte <jrg.otte@gmail.com>
      Cc: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
      Cc: Jani Nikula <jani.nikula@linux.intel.com>
      Cc: Daniel Vetter <daniel.vetter@intel.com>
      CC: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      01e2d062
    • L
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · c83727a6
      Linus Torvalds 提交于
      Pull VFS fixes from Al Viro:
       "Fixes for this cycle regression in overlayfs and a couple of
        long-standing (== all the way back to 2.6.12, at least) bugs"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
        freeing unlinked file indefinitely delayed
        fix a braino in ovl_d_select_inode()
        9p: don't leave a half-initialized inode sitting around
      c83727a6
    • L
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · 7fbb58a0
      Linus Torvalds 提交于
      Pull MIPS fixes from Ralf Baechle:
       "A fair number of 4.2 fixes also because Markos opened the flood gates.
      
         - Patch up the math used calculate the location for the page bitmap.
      
         - The FDC (Not what you think, FDC stands for Fast Debug Channel) IRQ
           around was causing issues on non-Malta platforms, so move the code
           to a Malta specific location.
      
         - A spelling fix replicated through several files.
      
         - Fix to the emulation of an R2 instruction for R6 cores.
      
         - Fix the JR emulation for R6.
      
         - Further patching of mindless 64 bit issues.
      
         - Ensure the kernel won't crash on CPUs with L2 caches with >= 8
           ways.
      
         - Use compat_sys_getsockopt for O32 ABI on 64 bit kernels.
      
         - Fix cache flushing for multithreaded cores.
      
         - A build fix"
      
      * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
        MIPS: O32: Use compat_sys_getsockopt.
        MIPS: c-r4k: Extend way_string array
        MIPS: Pistachio: Support CDMM & Fast Debug Channel
        MIPS: Malta: Make GIC FDC IRQ workaround Malta specific
        MIPS: c-r4k: Fix cache flushing for MT cores
        Revert "MIPS: Kconfig: Disable SMP/CPS for 64-bit"
        MIPS: cps-vec: Use macros for various arithmetics and memory operations
        MIPS: kernel: cps-vec: Replace KSEG0 with CKSEG0
        MIPS: kernel: cps-vec: Use ta0-ta3 pseudo-registers for 64-bit
        MIPS: kernel: cps-vec: Replace mips32r2 ISA level with mips64r2
        MIPS: kernel: cps-vec: Replace 'la' macro with PTR_LA
        MIPS: kernel: smp-cps: Fix 64-bit compatibility errors due to pointer casting
        MIPS: Fix erroneous JR emulation for MIPS R6
        MIPS: Fix branch emulation for BLTC and BGEC instructions
        MIPS: kernel: traps: Fix broken indentation
        MIPS: bootmem: Don't use memory holes for page bitmap
        MIPS: O32: Do not handle require 32 bytes from the stack to be readable.
        MIPS, CPUFREQ: Fix spelling of Institute.
        MIPS: Lemote 2F: Fix build caused by recent mass rename.
      7fbb58a0