From: Alexey Khoroshilov <khoroshilov@ispras.ru>
To: Christoph Hellwig <hch@infradead.org>
Cc: Alexey Khoroshilov <khoroshilov@ispras.ru>,
"James E.J. Bottomley" <jejb@linux.vnet.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
ldv-project@linuxtesting.org
Subject: [PATCH] scsi: mvumi: remove code handling zero scsi_sg_count(scmd) case
Date: Mon, 24 Apr 2017 02:01:00 +0300 [thread overview]
Message-ID: <1492988460-453-1-git-send-email-khoroshilov@ispras.ru> (raw)
In-Reply-To: <20170423084133.GE30869@infradead.org>
As Christoph Hellwig noted, SCSI commands that transfer data
always have a SG entry. The patch removes dead code in
mvumi_make_sgl(), mvumi_complete_cmd() and mvumi_timed_out()
that handle zero scsi_sg_count(scmd) case.
Also the patch adds pci_unmap_sg() on failure path in mvumi_make_sgl().
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
---
drivers/scsi/mvumi.c | 85 ++++++++++++++++------------------------------------
1 file changed, 26 insertions(+), 59 deletions(-)
diff --git a/drivers/scsi/mvumi.c b/drivers/scsi/mvumi.c
index 247df5e79b71..fe97401ad192 100644
--- a/drivers/scsi/mvumi.c
+++ b/drivers/scsi/mvumi.c
@@ -210,39 +210,27 @@ static int mvumi_make_sgl(struct mvumi_hba *mhba, struct scsi_cmnd *scmd,
unsigned int sgnum = scsi_sg_count(scmd);
dma_addr_t busaddr;
- if (sgnum) {
- sg = scsi_sglist(scmd);
- *sg_count = pci_map_sg(mhba->pdev, sg, sgnum,
- (int) scmd->sc_data_direction);
- if (*sg_count > mhba->max_sge) {
- dev_err(&mhba->pdev->dev, "sg count[0x%x] is bigger "
- "than max sg[0x%x].\n",
- *sg_count, mhba->max_sge);
- return -1;
- }
- for (i = 0; i < *sg_count; i++) {
- busaddr = sg_dma_address(&sg[i]);
- m_sg->baseaddr_l = cpu_to_le32(lower_32_bits(busaddr));
- m_sg->baseaddr_h = cpu_to_le32(upper_32_bits(busaddr));
- m_sg->flags = 0;
- sgd_setsz(mhba, m_sg, cpu_to_le32(sg_dma_len(&sg[i])));
- if ((i + 1) == *sg_count)
- m_sg->flags |= 1U << mhba->eot_flag;
-
- sgd_inc(mhba, m_sg);
- }
- } else {
- scmd->SCp.dma_handle = scsi_bufflen(scmd) ?
- pci_map_single(mhba->pdev, scsi_sglist(scmd),
- scsi_bufflen(scmd),
- (int) scmd->sc_data_direction)
- : 0;
- busaddr = scmd->SCp.dma_handle;
+ sg = scsi_sglist(scmd);
+ *sg_count = pci_map_sg(mhba->pdev, sg, sgnum,
+ (int) scmd->sc_data_direction);
+ if (*sg_count > mhba->max_sge) {
+ dev_err(&mhba->pdev->dev,
+ "sg count[0x%x] is bigger than max sg[0x%x].\n",
+ *sg_count, mhba->max_sge);
+ pci_unmap_sg(mhba->pdev, sg, sgnum,
+ (int) scmd->sc_data_direction);
+ return -1;
+ }
+ for (i = 0; i < *sg_count; i++) {
+ busaddr = sg_dma_address(&sg[i]);
m_sg->baseaddr_l = cpu_to_le32(lower_32_bits(busaddr));
m_sg->baseaddr_h = cpu_to_le32(upper_32_bits(busaddr));
- m_sg->flags = 1U << mhba->eot_flag;
- sgd_setsz(mhba, m_sg, cpu_to_le32(scsi_bufflen(scmd)));
- *sg_count = 1;
+ m_sg->flags = 0;
+ sgd_setsz(mhba, m_sg, cpu_to_le32(sg_dma_len(&sg[i])));
+ if ((i + 1) == *sg_count)
+ m_sg->flags |= 1U << mhba->eot_flag;
+
+ sgd_inc(mhba, m_sg);
}
return 0;
@@ -1350,21 +1338,10 @@ static void mvumi_complete_cmd(struct mvumi_hba *mhba, struct mvumi_cmd *cmd,
break;
}
- if (scsi_bufflen(scmd)) {
- if (scsi_sg_count(scmd)) {
- pci_unmap_sg(mhba->pdev,
- scsi_sglist(scmd),
- scsi_sg_count(scmd),
- (int) scmd->sc_data_direction);
- } else {
- pci_unmap_single(mhba->pdev,
- scmd->SCp.dma_handle,
- scsi_bufflen(scmd),
- (int) scmd->sc_data_direction);
-
- scmd->SCp.dma_handle = 0;
- }
- }
+ if (scsi_bufflen(scmd))
+ pci_unmap_sg(mhba->pdev, scsi_sglist(scmd),
+ scsi_sg_count(scmd),
+ (int) scmd->sc_data_direction);
cmd->scmd->scsi_done(scmd);
mvumi_return_cmd(mhba, cmd);
}
@@ -2171,19 +2148,9 @@ static enum blk_eh_timer_return mvumi_timed_out(struct scsi_cmnd *scmd)
scmd->result = (DRIVER_INVALID << 24) | (DID_ABORT << 16);
scmd->SCp.ptr = NULL;
if (scsi_bufflen(scmd)) {
- if (scsi_sg_count(scmd)) {
- pci_unmap_sg(mhba->pdev,
- scsi_sglist(scmd),
- scsi_sg_count(scmd),
- (int)scmd->sc_data_direction);
- } else {
- pci_unmap_single(mhba->pdev,
- scmd->SCp.dma_handle,
- scsi_bufflen(scmd),
- (int)scmd->sc_data_direction);
-
- scmd->SCp.dma_handle = 0;
- }
+ pci_unmap_sg(mhba->pdev, scsi_sglist(scmd),
+ scsi_sg_count(scmd),
+ (int)scmd->sc_data_direction);
}
mvumi_return_cmd(mhba, cmd);
spin_unlock_irqrestore(mhba->shost->host_lock, flags);
--
2.7.4
next prev parent reply other threads:[~2017-04-23 23:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-21 23:17 [PATCH] scsi: mvumi: add check for dma mapping errors Alexey Khoroshilov
2017-04-23 8:41 ` Christoph Hellwig
2017-04-23 23:01 ` Alexey Khoroshilov [this message]
2017-04-24 6:36 ` [PATCH] scsi: mvumi: remove code handling zero scsi_sg_count(scmd) case Christoph Hellwig
2017-04-24 22:17 ` Martin K. Petersen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1492988460-453-1-git-send-email-khoroshilov@ispras.ru \
--to=khoroshilov@ispras.ru \
--cc=hch@infradead.org \
--cc=jejb@linux.vnet.ibm.com \
--cc=ldv-project@linuxtesting.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=martin.petersen@oracle.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).