[PATCH-v4 4/8] vhost/scsi: Add ANY_LAYOUT iov - sgl mapping prerequisites

From: Nicholas Bellinger n...@linux-iscsi.org This patch adds ANY_LAYOUT prerequisites logic for accepting a set of protection + data payloads via iov_iter. Also includes helpers for calcuating SGLs + invoking vhost_scsi_map_to_sgl() with a known number of iovecs. Required by ANY_LAYOUT

[PATCH-v4 7/8] vhost/scsi: Drop left-over scsi_tcq.h include

From: Nicholas Bellinger n...@linux-iscsi.org With the recent removal of MSG_*_TAG defines in commit 68d81f40, vhost-scsi is now using TCM_*_TAG and doesn't depend upon host side scsi_tcq.h definitions anymore. Cc: Michael S. Tsirkin m...@redhat.com Acked-by: Michael S. Tsirkin m...@redhat.com

[PATCH-v4 8/8] vhost/scsi: Global tcm_vhost - vhost_scsi rename

From: Nicholas Bellinger n...@linux-iscsi.org There is a large amount of code that still references the original 'tcm_vhost' naming conventions, instead of modern 'vhost_scsi'. Go ahead and do a global rename to make the usage consistent. Cc: Michael S. Tsirkin m...@redhat.com Acked-by: Michael

[PATCH-v4 6/8] vhost/scsi: Set VIRTIO_F_ANY_LAYOUT + VIRTIO_F_VERSION_1 feature bits

From: Nicholas Bellinger n...@linux-iscsi.org Signal support of VIRTIO_F_ANY_LAYOUT + VIRTIO_F_VERSION_1 feature bits required for virtio-scsi 1.0 spec layout requirements. Cc: Michael S. Tsirkin m...@redhat.com Acked-by: Michael S. Tsirkin m...@redhat.com Cc: Paolo Bonzini pbonz...@redhat.com

[PATCH-v4 3/8] vhost/scsi: Change vhost_scsi_map_to_sgl to accept iov ptr + len

From: Nicholas Bellinger n...@linux-iscsi.org This patch changes vhost_scsi_map_to_sgl() parameters to accept virtio iovec ptr + len when determing pages_nr. This is currently done with iov_num_pages() - PAGE_ALIGN, so allow the same parameters as well. Cc: Michael S. Tsirkin m...@redhat.com

[PATCH-v4 0/8] vhost/scsi: Add ANY_LAYOUT + VERSION_1 support

From: Nicholas Bellinger n...@linux-iscsi.org Hi MST, Paolo, Al Co, Here is v4 patch series for vhost/scsi ANY_LAYOUT + VERSION_1 support. It updates vhost_virtqueue-handle_kick() - vhost_scsi_handle_vq() callback code to determine the start of protection + data payloads iovecs past the

[PATCH-v4 1/8] vhost/scsi: Convert completion path to use copy_to_iter

From: Nicholas Bellinger n...@linux-iscsi.org Required for ANY_LAYOUT support when the incoming virtio-scsi response header + fixed size sense buffer payload may span more than a single iovec entry. This changes existing code to save cmd-tvc_resp_iov instead of the first single iovec base

[PATCH-v4 2/8] vhost/scsi: Fix incorrect early vhost_scsi_handle_vq failures

From: Nicholas Bellinger n...@linux-iscsi.org This patch fixes vhost_scsi_handle_vq() failure cases that result in BUG_ON() getting triggered when vhost_scsi_free_cmd() is called, and -tvc_se_cmd has not been initialized by target_submit_cmd_map_sgls(). It changes tcm_vhost_release_cmd() to use

[PATCH] scsi: ips: fix sparse warnings

From: Lad, Prabhakar prabhakar.cse...@gmail.com this patch fixes following sparse warnings: ips.c:784:5: warning: symbol 'ips_eh_abort' was not declared. Should it be static? ips.c:1277:1: warning: symbol 'ips_intr_copperhead' was not declared. Should it be static? ips.c:1341:1: warning:

scsi race condition

I've encountered a race condition which causes the UFS driver to receive requests with an invalid tag (-1), and wondering how to go about solving the case. Consider the following scenario: 1. scsi_request_fn() - scsi_dispatch_cmd() - host-hostt-queuecommand() (mapped to ufshcd_queuecommand) 2.

[PATCH] scsi: fix sparse warnings

From: Lad, Prabhakar prabhakar.cse...@gmail.com this patch fixes following sparse warnings: scsi_sysfs.c:201:25: warning: symbol 'dev_attr_hstate' was not declared. Should it be static? scsi_sysfs.c:376:24: warning: symbol 'scsi_shost_attr_group' was not declared. Should it be static?

[PATCH] scsi: eata: fix sparse warning

From: Lad, Prabhakar prabhakar.cse...@gmail.com this patch fixes following sparse warning: eata.c:2049:5: warning: symbol 'eata2x_bios_param' was not declared. Should it be static? Signed-off-by: Lad, Prabhakar prabhakar.cse...@gmail.com --- Found this issue on linux-next (gcc version 4.9.2,

Re: [PATCH 1/1] Sync iscsi fw boot flags

On 02/03/2015 06:28 PM, micha...@cs.wisc.edu wrote: From: Mike Christie micha...@cs.wisc.edu iBFT and non-iBFT drivers use the same iscsi boot sysfs interface. For iBFT we just directly export whatever is left by the FW. For non-iBFT drivers we do vendor specific commands to get the info or

[PATCH] SCSI-bfa: Delete more unnecessary checks before the function call vfree

From: Markus Elfring elfr...@users.sourceforge.net Date: Thu, 5 Feb 2015 22:02:16 +0100 The vfree() function performs also input parameter validation. Thus the test around the call is not needed. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring

[PATCH] SCSI-aic7...: Delete unnecessary checks before the function call kfree

From: Markus Elfring elfr...@users.sourceforge.net Date: Thu, 5 Feb 2015 22:23:48 +0100 The kfree() function tests whether its argument is NULL and then returns immediately. Thus the test around the call is not needed. This issue was detected by using the Coccinelle software. Signed-off-by:

[PATCH 02/21] lpfc: Add Lancer Temperature Event support to the lpfc driver

--- drivers/scsi/lpfc/lpfc_hw4.h | 1 + drivers/scsi/lpfc/lpfc_init.c | 179 +- 2 files changed, 125 insertions(+), 55 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_hw4.h b/drivers/scsi/lpfc/lpfc_hw4.h index f432ec1..3121ec4 100644 ---

[PATCH 01/21] lpfc: Fix the iteration count to match the 30 sec comment

--- drivers/scsi/lpfc/lpfc_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index 0b2c53a..2b5b910 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -7953,7 +7953,7 @@ wait:

[PATCH 00/21] lpfc: Update lpfc version to driver version 10.5.0.0

This patch set updates the lpfc driver to revision 10.5.0.0 The patches were cut against Christoph's scsi-queue.git, branch drivers-for-3.20. -- james s James Smart (21): Fix the iteration count to match the 30 sec comment Add Lancer Temperature Event support to the lpfc driver

[PATCH 08/21] lpfc: lpfc does not support option_rom_version sysfs attribute on newer adapters

--- drivers/scsi/lpfc/lpfc_attr.c | 7 ++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c index 2f9b968..374aa03 100644 --- a/drivers/scsi/lpfc/lpfc_attr.c +++ b/drivers/scsi/lpfc/lpfc_attr.c @@ -406,8 +406,13 @@

[PATCH 03/21] lpfc: EnableBootCode from hbacmd fails on Lancer

--- drivers/scsi/lpfc/lpfc_bsg.c | 1 + drivers/scsi/lpfc/lpfc_bsg.h | 1 + 2 files changed, 2 insertions(+) diff --git a/drivers/scsi/lpfc/lpfc_bsg.c b/drivers/scsi/lpfc/lpfc_bsg.c index a7bf359..6b4cf31 100644 --- a/drivers/scsi/lpfc/lpfc_bsg.c +++ b/drivers/scsi/lpfc/lpfc_bsg.c @@ -4179,6

[PATCH 07/21] lpfc: Fix setting of EQ delay Multiplier

--- drivers/scsi/lpfc/lpfc_init.c | 8 drivers/scsi/lpfc/lpfc_sli.c | 9 +++-- drivers/scsi/lpfc/lpfc_sli4.h | 2 +- 3 files changed, 12 insertions(+), 7 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index 74672e0..e01619c 100644 ---

[PATCH 05/21] lpfc: Linux lpfc driver doesn't re-establish the link after a cable pull on LPe12002

--- drivers/scsi/lpfc/lpfc_els.c | 3 +-- drivers/scsi/lpfc/lpfc_hbadisc.c | 6 ++ 2 files changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c index c66088d..6350563 100644 --- a/drivers/scsi/lpfc/lpfc_els.c +++

[PATCH 09/21] lpfc: Parse the new 20G, 25G and 40G link speeds in the lpfc driver

--- drivers/scsi/lpfc/lpfc_hw4.h | 5 - drivers/scsi/lpfc/lpfc_init.c | 39 +++ 2 files changed, 31 insertions(+), 13 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_hw4.h b/drivers/scsi/lpfc/lpfc_hw4.h index 3121ec4..0b4c5afd6 100644 ---

[PATCH 04/21] lpfc: Fix to handle PLOGI when already logged in

--- drivers/scsi/lpfc/lpfc_nportdisc.c | 27 --- 1 file changed, 24 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_nportdisc.c b/drivers/scsi/lpfc/lpfc_nportdisc.c index 5cc1103..3d93363 100644 --- a/drivers/scsi/lpfc/lpfc_nportdisc.c +++

[PATCH 10/21] lpfc: Fix provide host name and OS name in RSNN-NN FC-GS command

--- drivers/scsi/lpfc/lpfc_ct.c | 23 --- 1 file changed, 20 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_ct.c b/drivers/scsi/lpfc/lpfc_ct.c index 61a32cd..5091184 100644 --- a/drivers/scsi/lpfc/lpfc_ct.c +++ b/drivers/scsi/lpfc/lpfc_ct.c @@ -1070,12

[PATCH 06/21] lpfc: Fix host reset escalation killing all IOs.

--- drivers/scsi/lpfc/lpfc_crtn.h | 1 + drivers/scsi/lpfc/lpfc_init.c | 11 --- drivers/scsi/lpfc/lpfc_scsi.c | 25 + 3 files changed, 34 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_crtn.h b/drivers/scsi/lpfc/lpfc_crtn.h index

[PATCH 11/21] lpfc: Fix FDMI Fabric support

--- drivers/scsi/lpfc/lpfc.h | 3 + drivers/scsi/lpfc/lpfc_attr.c| 16 +- drivers/scsi/lpfc/lpfc_ct.c | 715 +-- drivers/scsi/lpfc/lpfc_els.c | 2 +- drivers/scsi/lpfc/lpfc_hbadisc.c | 6 +- drivers/scsi/lpfc/lpfc_hw.h | 206

[PATCH 13/21] lpfc: Initiator sends wrong BBCredit value for either FLOGI or FLOGI_ACC

--- drivers/scsi/lpfc/lpfc_els.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c index 9f3c74e..f73d58c 100644 --- a/drivers/scsi/lpfc/lpfc_els.c +++ b/drivers/scsi/lpfc/lpfc_els.c @@ -5197,7 +5197,6 @@ lpfc_els_rcv_flogi(struct

[PATCH 12/21] lpfc: Fix null ndlp derefernce in target_reset_handler

--- drivers/scsi/lpfc/lpfc_scsi.c | 10 ++ 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index f623299..5612ba6 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -5202,10

[PATCH 14/21] lpfc: Fix premature release of rpi bit in bitmask

--- drivers/scsi/lpfc/lpfc_crtn.h| 1 + drivers/scsi/lpfc/lpfc_els.c | 5 drivers/scsi/lpfc/lpfc_hbadisc.c | 60 +++- drivers/scsi/lpfc/lpfc_init.c| 24 ++-- drivers/scsi/lpfc/lpfc_sli.c | 49 ++--

[PATCH 16/21] lpfc: Fix internal loopback failure

--- drivers/scsi/lpfc/lpfc_els.c | 6 +- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c index ba5da26..1003b5b 100644 --- a/drivers/scsi/lpfc/lpfc_els.c +++ b/drivers/scsi/lpfc/lpfc_els.c @@ -3337,7 +3337,11 @@

[PATCH 18/21] lpfc: Fix crash in device reset handler.

--- drivers/scsi/lpfc/lpfc_scsi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index 9ed5f44..fbdc39c 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -5464,9 +5464,10 @@

[PATCH 19/21] lpfc: Fix for lun discovery issue with 8Gig adapter.

--- drivers/scsi/lpfc/lpfc_scsi.c | 41 - 1 file changed, 20 insertions(+), 21 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index fbdc39c..e900902 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++

[PATCH 15/21] lpfc: Implement support for wire-only DIF devices

--- drivers/scsi/lpfc/lpfc.h | 41 drivers/scsi/lpfc/lpfc_attr.c| 65 ++- drivers/scsi/lpfc/lpfc_crtn.h| 3 +- drivers/scsi/lpfc/lpfc_hbadisc.c | 3 + drivers/scsi/lpfc/lpfc_init.c| 24 ++- drivers/scsi/lpfc/lpfc_mbox.c| 4 +-

[PATCH 17/21] lpfc: application causes OS crash when running diagnostics

--- drivers/scsi/lpfc/lpfc_bsg.c | 1 + drivers/scsi/lpfc/lpfc_sli.c | 12 drivers/scsi/lpfc/lpfc_sli.h | 1 + 3 files changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_bsg.c b/drivers/scsi/lpfc/lpfc_bsg.c index 6b4cf31..a05 100644 ---

[PATCH 21/21] lpfc: Update version to 10.5.0.0

--- drivers/scsi/lpfc/lpfc_version.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/lpfc/lpfc_version.h b/drivers/scsi/lpfc/lpfc_version.h index 9285a6d..c37bb9f 100644 --- a/drivers/scsi/lpfc/lpfc_version.h +++ b/drivers/scsi/lpfc/lpfc_version.h @@ -18,7 +18,7

[PATCH 20/21] lpfc: Update copyright to 2015

--- drivers/scsi/lpfc/lpfc.h | 2 +- drivers/scsi/lpfc/lpfc_attr.c | 2 +- drivers/scsi/lpfc/lpfc_bsg.c | 2 +- drivers/scsi/lpfc/lpfc_bsg.h | 2 +- drivers/scsi/lpfc/lpfc_crtn.h | 2 +- drivers/scsi/lpfc/lpfc_ct.c| 2 +- drivers/scsi/lpfc/lpfc_debugfs.c

[PATCH] Defer processing of REQ_PREEMPT requests for blocked devices

SCSI transport drivers and SCSI LLDs block a SCSI device if the transport layer is not operational. This means that in this state no requests should be processed, even if the REQ_PREEMPT flag has been set. This patch avoids that a rescan shortly after a cable pull sporadically triggers the

[PATCH 0/2] SCSI-lpfc: Deletion of an unnecessary check

From: Markus Elfring elfr...@users.sourceforge.net Date: Thu, 5 Feb 2015 23:17:52 +0100 Another update suggestion was taken into account after a patch was applied from static source code analysis. Markus Elfring (2): Delete an unnecessary check before the function call kfree One function

[PATCH 2/2] SCSI-lpfc: One function call less in lpfc_bsg_hba_set_event() after error detection

From: Markus Elfring elfr...@users.sourceforge.net Date: Thu, 5 Feb 2015 23:03:52 +0100 The kfree() function was called in two cases by the lpfc_bsg_hba_set_event() function during error handling even if the passed variable dd_data contained still a null pointer. This implementation detail could

[PATCH 1/2] SCSI-lpfc: Delete an unnecessary check before the function call kfree

From: Markus Elfring elfr...@users.sourceforge.net Date: Thu, 5 Feb 2015 22:45:02 +0100 The kfree() function tests whether its argument is NULL and then returns immediately. Thus the test around the call is not needed. This issue was detected by using the Coccinelle software. Signed-off-by:

[RFC] implementing tape statistics single file vs multi-file in sysfs

Hello linux-api'ers There has been some ongoing discussion about the best way to implement tape statistics. The original method suggested a long time ago used a single file in sysfs similar to block statistics in sysfs. That lead to an impass about the code on the linux-scsi mailing list. The

Re: [PATCH] st: implement sysfs based tape statistics v2

On 2.2.2015, at 17.16, Laurence Oberman oberma...@gmail.com wrote: I pulled this this morning and will be testing. The prior version was stable for me on the upstream and RHEL 6.5 kernel without exhaustive testing. We also just received more requests to get this into RHEL from HP / Red

Re: [PATCH] st: implement sysfs based tape statistics v2

- Original Message - From: Kai Mäkisara (Kolumbus) kai.makis...@kolumbus.fi To: Laurence Oberman oberma...@gmail.com Cc: Shane M Seymour shane.seym...@hp.com, lober...@redhat.com, linux-scsi@vger.kernel.org, James E.J. Bottomley (jbottom...@parallels.com) jbottom...@parallels.com,

[PATCH] scsi: dc395x: fix sparse warning

From: Lad, Prabhakar prabhakar.cse...@gmail.com this patch fixes following sparse warning: dc395x.c:1525:17: warning: Using plain integer as NULL pointer Signed-off-by: Lad, Prabhakar prabhakar.cse...@gmail.com --- Found this issue on linux-next (gcc version 4.9.2, sparse version

[PATCH] bfa: bfa_core: fix sparse warning

From: Lad, Prabhakar prabhakar.cse...@gmail.com this patch fixes following sparse warning: bfa_core.c:716:1: warning: symbol 'bfa_isr_rspq' was not declared. Should it be static? Signed-off-by: Lad, Prabhakar prabhakar.cse...@gmail.com --- Found this issue on linux-next (gcc version 4.9.2,

[PATCH] scsi: fix sparse warning

From: Lad, Prabhakar prabhakar.cse...@gmail.com this patch fixes following sparse warning: scsi_debug.c:2687:6: warning: symbol 'dump_sector' was not declared. Should it be static? Signed-off-by: Lad, Prabhakar prabhakar.cse...@gmail.com --- Found this issue on linux-next (gcc version 4.9.2,

[PATCH] scsi: qla1280: fix sparse warnings

From: Lad, Prabhakar prabhakar.cse...@gmail.com this patch fixes following sparse warnings: qla1280.c:557:1: warning: symbol 'qla1280_firmware_mutex' was not declared. Should it be static? qla1280.c:566:15: warning: symbol 'qla1280_fw_tbl' was not declared. Should it be static? Signed-off-by:

Re: [PATCH] scsi: fix sparse warnings

On 02/05/15 10:41, Lad Prabhakar wrote: this patch fixes following sparse warnings: scsi_sysfs.c:201:25: warning: symbol 'dev_attr_hstate' was not declared. Should it be static? scsi_sysfs.c:376:24: warning: symbol 'scsi_shost_attr_group' was not declared. Should it be static? Reviewed-by:

[PATCH] scsi: initio: fix sparse warnings

From: Lad, Prabhakar prabhakar.cse...@gmail.com this patch fixes following sparse warnings: initio.c:338:6: warning: symbol 'initio_se2_ew_en' was not declared. Should it be static? initio.c:352:6: warning: symbol 'initio_se2_ew_ds' was not declared. Should it be static? initio.c:897:22:

Re: [PATCH] st: implement sysfs based tape statistics v2

On 5.2.2015, at 19.40, Laurence Oberman lober...@redhat.com wrote: - Original Message - From: Kai Mäkisara (Kolumbus) kai.makis...@kolumbus.fi To: Laurence Oberman oberma...@gmail.com Cc: Shane M Seymour shane.seym...@hp.com, lober...@redhat.com, linux-scsi@vger.kernel.org, James

[GIT PULL] SCSI fixes for 3.19-rc7

This patch set is fixing two serious problems which have turned up late in the release cycle. The first fixes a problem with 4k sector disks where the transfer length (amount of data sent to the disk) was getting increased every time the disk was revalidated leading to potential for overflows.

Re: [PATCH] st: implement sysfs based tape statistics v2

On Thu, 2015-02-05 at 19:46 +0200, Kai Mäkisara (Kolumbus) wrote: On 5.2.2015, at 19.40, Laurence Oberman lober...@redhat.com wrote: I missed the earlier conversations with James, I will go search for them. Do you mean add them so they are similar to the /proc/diskstats cat

Re: [PATCH] st: implement sysfs based tape statistics v2

On Thu, Feb 05, 2015 at 07:46:32PM +0200, Kai Mäkisara (Kolumbus) wrote: On 5.2.2015, at 19.40, Laurence Oberman lober...@redhat.com wrote: From: Kai Mäkisara (Kolumbus) kai.makis...@kolumbus.fi I still think that the tape statistics should be exported like the statistics of “real” block

Re: [PATCH] st: implement sysfs based tape statistics v2

On Thu, 2015-02-05 at 18:50 +, Bryn M. Reeves wrote: On Thu, Feb 05, 2015 at 07:46:32PM +0200, Kai Mäkisara (Kolumbus) wrote: On 5.2.2015, at 19.40, Laurence Oberman lober...@redhat.com wrote: From: Kai Mäkisara (Kolumbus) kai.makis...@kolumbus.fi I still think that the tape

Re: [PATCH] st: implement sysfs based tape statistics v2

On Thu, Feb 05, 2015 at 10:55:50AM -0800, James Bottomley wrote: OK, the sysfs bikeshedders hang out on linux-api https://www.kernel.org/doc/man-pages/linux-api-ml.html If you can convince them, we'll do the single file approach. Will do - I've got a couple of stats projects on the go at

Re: [PATCH] st: implement sysfs based tape statistics v2

- Original Message - From: Kai Mäkisara (Kolumbus) kai.makis...@kolumbus.fi To: Laurence Oberman lober...@redhat.com Cc: Laurence Oberman oberma...@gmail.com, Shane M Seymour shane.seym...@hp.com, linux-scsi@vger.kernel.org, James E.J. Bottomley (jbottom...@parallels.com)

[PATCH] scsi-mq: fix potential deadlock in scsi_internal_device_unblock()

A process context may acquire struct blk_mq_hw_ctx::lock without disabling IRQs. A deadlock may result if the process context holding the spinlock is interrupted by an IRQ that calls scsi_internal_device_unblock(), which may also try to acquire the same spinlock. Pass 'async = true' to