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SCSI fixes on 20180627

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Three small bug fixes (barrier elimination, memory leak on unload,
 spinlock recursion) and a technical enhancement left over from the
 merge window: the TCMU read length support is required for tape
 devices read when the length of the read is greater than the tape
 block size.
 
 Signed-off-by: James E.J. Bottomley <jejb@linux.vnet.ibm.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:
 "Three small bug fixes (barrier elimination, memory leak on unload,
  spinlock recursion) and a technical enhancement left over from the
  merge window: the TCMU read length support is required for tape
  devices read when the length of the read is greater than the tape
  block size"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: scsi_debug: Fix memory leak on module unload
  scsi: qla2xxx: Spinlock recursion in qla_target
  scsi: ipr: Eliminate duplicate barriers
  scsi: target: tcmu: add read length support
This commit is contained in:
Linus Torvalds 2018-06-27 09:42:16 -07:00
commit debd52a050
5 changed files with 43 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/scsi/ipr.c
View File

@ -760,7 +760,6 @@ static void ipr_mask_and_clear_interrupts(struct ipr_ioa_cfg *ioa_cfg,
ioa_cfg->hrrq[i].allow_interrupts = 0;
spin_unlock(&ioa_cfg->hrrq[i]._lock);
}
wmb();
/* Set interrupt mask to stop all new interrupts */
if (ioa_cfg->sis64)
@ -8403,7 +8402,6 @@ static int ipr_reset_enable_ioa(struct ipr_cmnd *ipr_cmd)
ioa_cfg->hrrq[i].allow_interrupts = 1;
spin_unlock(&ioa_cfg->hrrq[i]._lock);
}
wmb();
if (ioa_cfg->sis64) {
/* Set the adapter to the correct endian mode. */
writel(IPR_ENDIAN_SWAP_KEY, ioa_cfg->regs.endian_swap_reg);

7
drivers/scsi/qla2xxx/qla_target.c
View File

@ -1224,7 +1224,6 @@ static void qla24xx_chk_fcp_state(struct fc_port *sess)
void qlt_schedule_sess_for_deletion(struct fc_port *sess)
{
struct qla_tgt *tgt = sess->tgt;
struct qla_hw_data *ha = sess->vha->hw;
unsigned long flags;
if (sess->disc_state == DSC_DELETE_PEND)
@ -1241,16 +1240,16 @@ void qlt_schedule_sess_for_deletion(struct fc_port *sess)
return;
}
spin_lock_irqsave(&ha->tgt.sess_lock, flags);
if (sess->deleted == QLA_SESS_DELETED)
sess->logout_on_delete = 0;
spin_lock_irqsave(&sess->vha->work_lock, flags);
if (sess->deleted == QLA_SESS_DELETION_IN_PROGRESS) {
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
spin_unlock_irqrestore(&sess->vha->work_lock, flags);
return;
}
sess->deleted = QLA_SESS_DELETION_IN_PROGRESS;
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
spin_unlock_irqrestore(&sess->vha->work_lock, flags);
sess->disc_state = DSC_DELETE_PEND;

2
drivers/scsi/scsi_debug.c
View File

@ -5507,9 +5507,9 @@ static void __exit scsi_debug_exit(void)
int k = sdebug_add_host;
stop_all_queued();
free_all_queued();
for (; k; k--)
sdebug_remove_adapter();
free_all_queued();
driver_unregister(&sdebug_driverfs_driver);
bus_unregister(&pseudo_lld_bus);
root_device_unregister(pseudo_primary);

42
drivers/target/target_core_user.c
View File

@ -656,7 +656,7 @@ static void scatter_data_area(struct tcmu_dev *udev,
}
static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd,
bool bidi)
bool bidi, uint32_t read_len)
{
struct se_cmd *se_cmd = cmd->se_cmd;
int i, dbi;
@ -689,7 +689,7 @@ static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd,
for_each_sg(data_sg, sg, data_nents, i) {
int sg_remaining = sg->length;
to = kmap_atomic(sg_page(sg)) + sg->offset;
while (sg_remaining > 0) {
while (sg_remaining > 0 && read_len > 0) {
if (block_remaining == 0) {
if (from)
kunmap_atomic(from);
@ -701,6 +701,8 @@ static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd,
}
copy_bytes = min_t(size_t, sg_remaining,
block_remaining);
if (read_len < copy_bytes)
copy_bytes = read_len;
offset = DATA_BLOCK_SIZE - block_remaining;
tcmu_flush_dcache_range(from, copy_bytes);
memcpy(to + sg->length - sg_remaining, from + offset,
@ -708,8 +710,11 @@ static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd,
sg_remaining -= copy_bytes;
block_remaining -= copy_bytes;
read_len -= copy_bytes;
}
kunmap_atomic(to - sg->offset);
if (read_len == 0)
break;
}
if (from)
kunmap_atomic(from);
@ -1042,6 +1047,8 @@ static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *
{
struct se_cmd *se_cmd = cmd->se_cmd;
struct tcmu_dev *udev = cmd->tcmu_dev;
bool read_len_valid = false;
uint32_t read_len = se_cmd->data_length;
/*
* cmd has been completed already from timeout, just reclaim
@ -1056,13 +1063,28 @@ static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *
pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n",
cmd->se_cmd);
entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION;
} else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) {
goto done;
}
if (se_cmd->data_direction == DMA_FROM_DEVICE &&
(entry->hdr.uflags & TCMU_UFLAG_READ_LEN) && entry->rsp.read_len) {
read_len_valid = true;
if (entry->rsp.read_len < read_len)
read_len = entry->rsp.read_len;
}
if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) {
transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer);
} else if (se_cmd->se_cmd_flags & SCF_BIDI) {
if (!read_len_valid )
goto done;
else
se_cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL;
}
if (se_cmd->se_cmd_flags & SCF_BIDI) {
/* Get Data-In buffer before clean up */
gather_data_area(udev, cmd, true);
gather_data_area(udev, cmd, true, read_len);
} else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
gather_data_area(udev, cmd, false);
gather_data_area(udev, cmd, false, read_len);
} else if (se_cmd->data_direction == DMA_TO_DEVICE) {
/* TODO: */
} else if (se_cmd->data_direction != DMA_NONE) {
@ -1070,6 +1092,12 @@ static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *
se_cmd->data_direction);
}
done:
if (read_len_valid) {
pr_debug("read_len = %d\n", read_len);
target_complete_cmd_with_length(cmd->se_cmd,
entry->rsp.scsi_status, read_len);
} else
target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status);
out:
@ -1740,7 +1768,7 @@ static int tcmu_configure_device(struct se_device *dev)
/* Initialise the mailbox of the ring buffer */
mb = udev->mb_addr;
mb->version = TCMU_MAILBOX_VERSION;
mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC;
mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC | TCMU_MAILBOX_FLAG_CAP_READ_LEN;
mb->cmdr_off = CMDR_OFF;
mb->cmdr_size = udev->cmdr_size;

4
include/uapi/linux/target_core_user.h
View File

@ -44,6 +44,7 @@
#define TCMU_MAILBOX_VERSION 2
#define ALIGN_SIZE 64 /* Should be enough for most CPUs */
#define TCMU_MAILBOX_FLAG_CAP_OOOC (1 << 0) /* Out-of-order completions */
#define TCMU_MAILBOX_FLAG_CAP_READ_LEN (1 << 1) /* Read data length */
struct tcmu_mailbox {
__u16 version;
@ -71,6 +72,7 @@ struct tcmu_cmd_entry_hdr {
__u16 cmd_id;
__u8 kflags;
#define TCMU_UFLAG_UNKNOWN_OP 0x1
#define TCMU_UFLAG_READ_LEN 0x2
__u8 uflags;
} __packed;
@ -119,7 +121,7 @@ struct tcmu_cmd_entry {
__u8 scsi_status;
__u8 __pad1;
__u16 __pad2;
__u32 __pad3;
__u32 read_len;
char sense_buffer[TCMU_SENSE_BUFFERSIZE];
} rsp;
};