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SCSI fixes on 20150823 

A couple of major (hang and deadlock) fixes with fortunately fairly rare
 triggering conditions.  The PM oops is only really triggered by people using
 enclosure services (rare) and the fnic driver is mostly used in enterprise
 environments.
 
 Signed-off-by: James Bottomley <JBottomley@Odin.com>
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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "A couple of major (hang and deadlock) fixes with fortunately fairly
  rare triggering conditions.  The PM oops is only really triggered by
  people using enclosure services (rare) and the fnic driver is mostly
  used in enterprise environments"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  SCSI: Fix NULL pointer dereference in runtime PM
  fnic: Use the local variable instead of I/O flag to acquire io_req_lock in fnic_queuecommand() to avoid deadloack
This commit is contained in:
Linus Torvalds 2015-08-23 20:46:22 -07:00
parent eb63b34bdf 49718f0fb8
commit d683477020
3 changed files with 15 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/scsi/fnic/fnic.h
View File

@ -39,7 +39,7 @@
#define DRV_NAME "fnic"
#define DRV_DESCRIPTION "Cisco FCoE HBA Driver"
#define DRV_VERSION "1.6.0.17"
#define DRV_VERSION "1.6.0.17a"
#define PFX DRV_NAME ": "
#define DFX DRV_NAME "%d: "

4
drivers/scsi/fnic/fnic_scsi.c
View File

@ -425,6 +425,7 @@ static int fnic_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_
unsigned long ptr;
struct fc_rport_priv *rdata;
spinlock_t *io_lock = NULL;
int io_lock_acquired = 0;
if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED)))
return SCSI_MLQUEUE_HOST_BUSY;
@ -518,6 +519,7 @@ static int fnic_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_
spin_lock_irqsave(io_lock, flags);
/* initialize rest of io_req */
io_lock_acquired = 1;
io_req->port_id = rport->port_id;
io_req->start_time = jiffies;
CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
@ -571,7 +573,7 @@ out:
(((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
/* if only we issued IO, will we have the io lock */
if (CMD_FLAGS(sc) & FNIC_IO_INITIALIZED)
if (io_lock_acquired)
spin_unlock_irqrestore(io_lock, flags);
atomic_dec(&fnic->in_flight);

22
drivers/scsi/scsi_pm.c
View File

@ -217,15 +217,15 @@ static int sdev_runtime_suspend(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
struct scsi_device *sdev = to_scsi_device(dev);
int err;
int err = 0;
err = blk_pre_runtime_suspend(sdev->request_queue);
if (err)
return err;
if (pm && pm->runtime_suspend)
if (pm && pm->runtime_suspend) {
err = blk_pre_runtime_suspend(sdev->request_queue);
if (err)
return err;
err = pm->runtime_suspend(dev);
blk_post_runtime_suspend(sdev->request_queue, err);
blk_post_runtime_suspend(sdev->request_queue, err);
}
return err;
}
@ -248,11 +248,11 @@ static int sdev_runtime_resume(struct device *dev)
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int err = 0;
blk_pre_runtime_resume(sdev->request_queue);
if (pm && pm->runtime_resume)
if (pm && pm->runtime_resume) {
blk_pre_runtime_resume(sdev->request_queue);
err = pm->runtime_resume(dev);
blk_post_runtime_resume(sdev->request_queue, err);
blk_post_runtime_resume(sdev->request_queue, err);
}
return err;
}