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Groups > linux.kernel > #1167288

[PATCH 3.13.y-ckt 026/122] 3w-9xxx: fix command completion race

From Kamal Mostafa <kamal@canonical.com>
Newsgroups linux.kernel
Subject [PATCH 3.13.y-ckt 026/122] 3w-9xxx: fix command completion race
Date 2015-06-18 01:00 +0200
Message-ID <pCutk-6Ve-5@gated-at.bofh.it> (permalink)
References <pCu0j-6mo-39@gated-at.bofh.it>
Organization linux.* mail to news gateway

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3.13.11-ckt22 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christoph Hellwig <hch@lst.de>

commit 118c855b5623f3e2e6204f02623d88c09e0c34de upstream.

The 3w-9xxx driver needs to tear down the dma mappings before returning
the command to the midlayer, as there is no guarantee the sglist and
count are valid after that point.  Also remove the dma mapping helpers
which have another inherent race due to the request_id index.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/scsi/3w-9xxx.c | 57 ++++++++++++--------------------------------------
 drivers/scsi/3w-9xxx.h |  5 -----
 2 files changed, 13 insertions(+), 49 deletions(-)

diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
index 0a73253..5f57e3d 100644
--- a/drivers/scsi/3w-9xxx.c
+++ b/drivers/scsi/3w-9xxx.c
@@ -149,7 +149,6 @@ static int twa_reset_sequence(TW_Device_Extension *tw_dev, int soft_reset);
 static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id, char *cdb, int use_sg, TW_SG_Entry *sglistarg);
 static void twa_scsiop_execute_scsi_complete(TW_Device_Extension *tw_dev, int request_id);
 static char *twa_string_lookup(twa_message_type *table, unsigned int aen_code);
-static void twa_unmap_scsi_data(TW_Device_Extension *tw_dev, int request_id);
 
 /* Functions */
 
@@ -1352,11 +1351,11 @@ static irqreturn_t twa_interrupt(int irq, void *dev_instance)
 				}
 
 				/* Now complete the io */
+				scsi_dma_unmap(cmd);
+				cmd->scsi_done(cmd);
 				tw_dev->state[request_id] = TW_S_COMPLETED;
 				twa_free_request_id(tw_dev, request_id);
 				tw_dev->posted_request_count--;
-				tw_dev->srb[request_id]->scsi_done(tw_dev->srb[request_id]);
-				twa_unmap_scsi_data(tw_dev, request_id);
 			}
 
 			/* Check for valid status after each drain */
@@ -1414,26 +1413,6 @@ static void twa_load_sgl(TW_Device_Extension *tw_dev, TW_Command_Full *full_comm
 	}
 } /* End twa_load_sgl() */
 
-/* This function will perform a pci-dma mapping for a scatter gather list */
-static int twa_map_scsi_sg_data(TW_Device_Extension *tw_dev, int request_id)
-{
-	int use_sg;
-	struct scsi_cmnd *cmd = tw_dev->srb[request_id];
-
-	use_sg = scsi_dma_map(cmd);
-	if (!use_sg)
-		return 0;
-	else if (use_sg < 0) {
-		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1c, "Failed to map scatter gather list");
-		return 0;
-	}
-
-	cmd->SCp.phase = TW_PHASE_SGLIST;
-	cmd->SCp.have_data_in = use_sg;
-
-	return use_sg;
-} /* End twa_map_scsi_sg_data() */
-
 /* This function will poll for a response interrupt of a request */
 static int twa_poll_response(TW_Device_Extension *tw_dev, int request_id, int seconds)
 {
@@ -1612,9 +1591,11 @@ static int twa_reset_device_extension(TW_Device_Extension *tw_dev)
 		    (tw_dev->state[i] != TW_S_INITIAL) &&
 		    (tw_dev->state[i] != TW_S_COMPLETED)) {
 			if (tw_dev->srb[i]) {
-				tw_dev->srb[i]->result = (DID_RESET << 16);
-				tw_dev->srb[i]->scsi_done(tw_dev->srb[i]);
-				twa_unmap_scsi_data(tw_dev, i);
+				struct scsi_cmnd *cmd = tw_dev->srb[i];
+
+				cmd->result = (DID_RESET << 16);
+				scsi_dma_unmap(cmd);
+				cmd->scsi_done(cmd);
 			}
 		}
 	}
@@ -1793,21 +1774,18 @@ static int twa_scsi_queue_lck(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_
 	/* Save the scsi command for use by the ISR */
 	tw_dev->srb[request_id] = SCpnt;
 
-	/* Initialize phase to zero */
-	SCpnt->SCp.phase = TW_PHASE_INITIAL;
-
 	retval = twa_scsiop_execute_scsi(tw_dev, request_id, NULL, 0, NULL);
 	switch (retval) {
 	case SCSI_MLQUEUE_HOST_BUSY:
+		scsi_dma_unmap(SCpnt);
 		twa_free_request_id(tw_dev, request_id);
-		twa_unmap_scsi_data(tw_dev, request_id);
 		break;
 	case 1:
-		tw_dev->state[request_id] = TW_S_COMPLETED;
-		twa_free_request_id(tw_dev, request_id);
-		twa_unmap_scsi_data(tw_dev, request_id);
 		SCpnt->result = (DID_ERROR << 16);
+		scsi_dma_unmap(SCpnt);
 		done(SCpnt);
+		tw_dev->state[request_id] = TW_S_COMPLETED;
+		twa_free_request_id(tw_dev, request_id);
 		retval = 0;
 	}
 out:
@@ -1875,8 +1853,8 @@ static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id,
 				command_packet->sg_list[0].address = TW_CPU_TO_SGL(tw_dev->generic_buffer_phys[request_id]);
 				command_packet->sg_list[0].length = cpu_to_le32(TW_MIN_SGL_LENGTH);
 			} else {
-				sg_count = twa_map_scsi_sg_data(tw_dev, request_id);
-				if (sg_count == 0)
+				sg_count = scsi_dma_map(srb);
+				if (sg_count < 0)
 					goto out;
 
 				scsi_for_each_sg(srb, sg, sg_count, i) {
@@ -1991,15 +1969,6 @@ static char *twa_string_lookup(twa_message_type *table, unsigned int code)
 	return(table[index].text);
 } /* End twa_string_lookup() */
 
-/* This function will perform a pci-dma unmap */
-static void twa_unmap_scsi_data(TW_Device_Extension *tw_dev, int request_id)
-{
-	struct scsi_cmnd *cmd = tw_dev->srb[request_id];
-
-	if (cmd->SCp.phase == TW_PHASE_SGLIST)
-		scsi_dma_unmap(cmd);
-} /* End twa_unmap_scsi_data() */
-
 /* This function gets called when a disk is coming on-line */
 static int twa_slave_configure(struct scsi_device *sdev)
 {
diff --git a/drivers/scsi/3w-9xxx.h b/drivers/scsi/3w-9xxx.h
index 040f721..0fdc83c 100644
--- a/drivers/scsi/3w-9xxx.h
+++ b/drivers/scsi/3w-9xxx.h
@@ -324,11 +324,6 @@ static twa_message_type twa_error_table[] = {
 #define TW_CURRENT_DRIVER_BUILD 0
 #define TW_CURRENT_DRIVER_BRANCH 0
 
-/* Phase defines */
-#define TW_PHASE_INITIAL 0
-#define TW_PHASE_SINGLE  1
-#define TW_PHASE_SGLIST  2
-
 /* Misc defines */
 #define TW_9550SX_DRAIN_COMPLETED	      0xFFFF
 #define TW_SECTOR_SIZE                        512
-- 
1.9.1

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[3.13.y-ckt stable] Linux 3.13.11-ckt22 stable review Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:30 +0200
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  [PATCH 3.13.y-ckt 090/122] Drivers: hv: vmbus: Add support for VMBus panic notifier handler Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:50 +0200
  [PATCH 3.13.y-ckt 073/122] ACPI / init: Fix the ordering of acpi_reserve_resources() Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:50 +0200
  [PATCH 3.13.y-ckt 091/122] Drivers: hv: vmbus: Correcting truncation error for constant HV_CRASH_CTL_CRASH_NOTIFY Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:50 +0200
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  [PATCH 3.13.y-ckt 072/122] svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:50 +0200
  [PATCH 3.13.y-ckt 076/122] xhci: Solve full event ring by increasing TRBS_PER_SEGMENT to 256 Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:50 +0200
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  [PATCH 3.13.y-ckt 043/122] ARM: dts: imx28: Fix AUART4 TX-DMA interrupt name Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 023/122] SCSI: add 1024 max sectors black list flag Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 024/122] 3w-sas: fix command completion race Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 017/122] ozwpan: unchecked signed subtraction leads to DoS Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 040/122] ARM: dts: imx23-olinuxino: Fix polarity of LED GPIO Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 020/122] ALSA: emu10k1: Fix card shortname string buffer overflow Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
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  [PATCH 3.13.y-ckt 039/122] ARM: mvebu: armada-xp-openblocks-ax3-4: Disable internal RTC Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 019/122] ALSA: hda - Fix mute-LED fixed mode Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 042/122] ARM: dts: imx25: Add #pwm-cells to pwm4 Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 036/122] efivarfs: Ensure VariableName is NUL-terminated Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 041/122] ARM: dts: imx23-olinuxino: Fix dr_mode of usb0 Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 030/122] tty/serial: at91: maxburst was missing for dma transfers Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 050/122] xen/events: Set irq_info->evtchn before binding the channel to CPU in __startup_pirq() Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 035/122] bridge/mdb: remove wrong use of NLM_F_MULTI Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 038/122] writeback: use |1 instead of +1 to protect against div by zero Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 016/122] ozwpan: Use proper check to prevent heap overflow Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 046/122] RDMA/CMA: Canonize IPv4 on IPV6 sockets properly Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 045/122] drm/radeon: disable semaphores for UVD V1 (v2) Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 027/122] cdc-acm: prevent infinite loop when parsing CDC headers. Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 028/122] serial: xilinx: Use platform_get_irq to get irq description structure Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 048/122] drm/i915: Add missing MacBook Pro models with dual channel LVDS Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 049/122] xen/console: Update console event channel on resume Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 033/122] rbd: end I/O the entire obj_request on error Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 032/122] ALSA: emu10k1: Emu10k2 32 bit DMA mode Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 015/122] ozwpan: divide-by-zero leading to panic Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 037/122] x86/efi: Store upper bits of command line buffer address in ext_cmd_line_ptr Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 014/122] ozwpan: Use unsigned ints to prevent heap overflow Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 047/122] drm/i915: Assume dual channel LVDS if pixel clock necessitates it Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 022/122] drm/radeon: add SI DPM quirk for Sapphire R9 270 Dual-X 2G GDDR5 Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 007/122] qla2xxx: remove redundant declaration in 'qla_gbl.h' Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 002/122] vhost/scsi: potential memory corruption Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 008/122] staging: wlags49_h2: fix extern inline functions Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 012/122] udf: Remove repeated loads blocksize Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 021/122] ALSA: emux: Fix mutex deadlock at unloading Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 006/122] staging: rtl8712, rtl8712: avoid lots of build warnings Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 010/122] kconfig: Fix warning "‘jump’ may be used uninitialized" Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 001/122] Btrfs: make xattr replace operations atomic Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 005/122] staging, rtl8192e, LLVMLinux: Remove unused inline prototype Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 013/122] udf: Check length of extended attributes and allocation descriptors Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 009/122] ARM: 8307/1: psci: move psci firmware calls out of line Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 004/122] kernel: use the gnu89 standard explicitly Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200

csiph-web