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Message-ID: <1438532273.2182.28.camel@HansenPartnership.com>
Date: Sun, 02 Aug 2015 09:17:53 -0700
From: James Bottomley <James.Bottomley@...senPartnership.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-scsi <linux-scsi@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: [GIT PULL] SCSI fixes for 4.2-rc4
A set of three fixes for the ipr driver and one fairly major one for
memory leaks in the mq path of SCSI.
The patch is available here:
git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git scsi-fixes
The short changelog is:
Brian King (3):
ipr: Fix invalid array indexing for HRRQ
ipr: Fix incorrect trace indexing
ipr: Fix locking for unit attention handling
Tony Battersby (1):
scsi: fix memory leak with scsi-mq
And the diffstat:
drivers/scsi/ipr.c | 28 ++++++++++++++++++----------
drivers/scsi/ipr.h | 1 +
drivers/scsi/scsi_error.c | 2 +-
drivers/scsi/scsi_lib.c | 6 +++---
4 files changed, 23 insertions(+), 14 deletions(-)
With full diff below
James
---
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 8827448..a9aa389 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -599,9 +599,10 @@ static void ipr_trc_hook(struct ipr_cmnd *ipr_cmd,
{
struct ipr_trace_entry *trace_entry;
struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
+ unsigned int trace_index;
- trace_entry = &ioa_cfg->trace[atomic_add_return
- (1, &ioa_cfg->trace_index)%IPR_NUM_TRACE_ENTRIES];
+ trace_index = atomic_add_return(1, &ioa_cfg->trace_index) & IPR_TRACE_INDEX_MASK;
+ trace_entry = &ioa_cfg->trace[trace_index];
trace_entry->time = jiffies;
trace_entry->op_code = ipr_cmd->ioarcb.cmd_pkt.cdb[0];
trace_entry->type = type;
@@ -1051,10 +1052,15 @@ static void ipr_send_blocking_cmd(struct ipr_cmnd *ipr_cmd,
static int ipr_get_hrrq_index(struct ipr_ioa_cfg *ioa_cfg)
{
+ unsigned int hrrq;
+
if (ioa_cfg->hrrq_num == 1)
- return 0;
- else
- return (atomic_add_return(1, &ioa_cfg->hrrq_index) % (ioa_cfg->hrrq_num - 1)) + 1;
+ hrrq = 0;
+ else {
+ hrrq = atomic_add_return(1, &ioa_cfg->hrrq_index);
+ hrrq = (hrrq % (ioa_cfg->hrrq_num - 1)) + 1;
+ }
+ return hrrq;
}
/**
@@ -6263,21 +6269,23 @@ static void ipr_scsi_done(struct ipr_cmnd *ipr_cmd)
struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;
u32 ioasc = be32_to_cpu(ipr_cmd->s.ioasa.hdr.ioasc);
- unsigned long hrrq_flags;
+ unsigned long lock_flags;
scsi_set_resid(scsi_cmd, be32_to_cpu(ipr_cmd->s.ioasa.hdr.residual_data_len));
if (likely(IPR_IOASC_SENSE_KEY(ioasc) == 0)) {
scsi_dma_unmap(scsi_cmd);
- spin_lock_irqsave(ipr_cmd->hrrq->lock, hrrq_flags);
+ spin_lock_irqsave(ipr_cmd->hrrq->lock, lock_flags);
list_add_tail(&ipr_cmd->queue, &ipr_cmd->hrrq->hrrq_free_q);
scsi_cmd->scsi_done(scsi_cmd);
- spin_unlock_irqrestore(ipr_cmd->hrrq->lock, hrrq_flags);
+ spin_unlock_irqrestore(ipr_cmd->hrrq->lock, lock_flags);
} else {
- spin_lock_irqsave(ipr_cmd->hrrq->lock, hrrq_flags);
+ spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+ spin_lock(&ipr_cmd->hrrq->_lock);
ipr_erp_start(ioa_cfg, ipr_cmd);
- spin_unlock_irqrestore(ipr_cmd->hrrq->lock, hrrq_flags);
+ spin_unlock(&ipr_cmd->hrrq->_lock);
+ spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
}
}
diff --git a/drivers/scsi/ipr.h b/drivers/scsi/ipr.h
index 73790a1..6b97ee4 100644
--- a/drivers/scsi/ipr.h
+++ b/drivers/scsi/ipr.h
@@ -1486,6 +1486,7 @@ struct ipr_ioa_cfg {
#define IPR_NUM_TRACE_INDEX_BITS 8
#define IPR_NUM_TRACE_ENTRIES (1 << IPR_NUM_TRACE_INDEX_BITS)
+#define IPR_TRACE_INDEX_MASK (IPR_NUM_TRACE_ENTRIES - 1)
#define IPR_TRACE_SIZE (sizeof(struct ipr_trace_entry) * IPR_NUM_TRACE_ENTRIES)
char trace_start[8];
#define IPR_TRACE_START_LABEL "trace"
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 106884a..cfadcce 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -944,7 +944,7 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
scmd->sdb.length);
scmd->sdb.table.sgl = &ses->sense_sgl;
scmd->sc_data_direction = DMA_FROM_DEVICE;
- scmd->sdb.table.nents = 1;
+ scmd->sdb.table.nents = scmd->sdb.table.orig_nents = 1;
scmd->cmnd[0] = REQUEST_SENSE;
scmd->cmnd[4] = scmd->sdb.length;
scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index b1a2631..448ebda 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -583,7 +583,7 @@ static struct scatterlist *scsi_sg_alloc(unsigned int nents, gfp_t gfp_mask)
static void scsi_free_sgtable(struct scsi_data_buffer *sdb, bool mq)
{
- if (mq && sdb->table.nents <= SCSI_MAX_SG_SEGMENTS)
+ if (mq && sdb->table.orig_nents <= SCSI_MAX_SG_SEGMENTS)
return;
__sg_free_table(&sdb->table, SCSI_MAX_SG_SEGMENTS, mq, scsi_sg_free);
}
@@ -597,8 +597,8 @@ static int scsi_alloc_sgtable(struct scsi_data_buffer *sdb, int nents, bool mq)
if (mq) {
if (nents <= SCSI_MAX_SG_SEGMENTS) {
- sdb->table.nents = nents;
- sg_init_table(sdb->table.sgl, sdb->table.nents);
+ sdb->table.nents = sdb->table.orig_nents = nents;
+ sg_init_table(sdb->table.sgl, nents);
return 0;
}
first_chunk = sdb->table.sgl;
--
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