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Message-Id: <20201217203321.4539-3-parri.andrea@gmail.com>
Date: Thu, 17 Dec 2020 21:33:20 +0100
From: "Andrea Parri (Microsoft)" <parri.andrea@...il.com>
To: linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org
Cc: "K . Y . Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Stephen Hemminger <sthemmin@...rosoft.com>,
Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
Michael Kelley <mikelley@...rosoft.com>,
Saruhan Karademir <skarade@...rosoft.com>,
Juan Vazquez <juvazq@...rosoft.com>,
"Andrea Parri (Microsoft)" <parri.andrea@...il.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
linux-scsi@...r.kernel.org
Subject: [PATCH 2/3] scsi: storvsc: Resolve data race in storvsc_probe()
vmscsi_size_delta can be written concurrently by multiple instances of
storvsc_probe(), corresponding to multiple synthetic IDE/SCSI devices;
cf. storvsc_drv's probe_type == PROBE_PREFER_ASYNCHRONOUS. Change the
global variable vmscsi_size_delta to per-synthetic-IDE/SCSI-device.
Suggested-by: Dexuan Cui <decui@...rosoft.com>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org
---
drivers/scsi/storvsc_drv.c | 45 +++++++++++++++++++++-----------------
1 file changed, 25 insertions(+), 20 deletions(-)
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 64298aa2f151e..8714355cb63e7 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -216,18 +216,6 @@ struct vmscsi_request {
} __attribute((packed));
-
-/*
- * The size of the vmscsi_request has changed in win8. The
- * additional size is because of new elements added to the
- * structure. These elements are valid only when we are talking
- * to a win8 host.
- * Track the correction to size we need to apply. This value
- * will likely change during protocol negotiation but it is
- * valid to start by assuming pre-Win8.
- */
-static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
-
/*
* The list of storage protocols in order of preference.
*/
@@ -449,6 +437,17 @@ struct storvsc_device {
unsigned char path_id;
unsigned char target_id;
+ /*
+ * The size of the vmscsi_request has changed in win8. The
+ * additional size is because of new elements added to the
+ * structure. These elements are valid only when we are talking
+ * to a win8 host.
+ * Track the correction to size we need to apply. This value
+ * will likely change during protocol negotiation but it is
+ * valid to start by assuming pre-Win8.
+ */
+ int vmscsi_size_delta;
+
/*
* Max I/O, the device can support.
*/
@@ -762,7 +761,7 @@ static void handle_multichannel_storage(struct hv_device *device, int max_chns)
ret = vmbus_sendpacket(device->channel, vstor_packet,
(sizeof(struct vstor_packet) -
- vmscsi_size_delta),
+ stor_device->vmscsi_size_delta),
(unsigned long)request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
@@ -816,9 +815,14 @@ static int storvsc_execute_vstor_op(struct hv_device *device,
struct storvsc_cmd_request *request,
bool status_check)
{
+ struct storvsc_device *stor_device;
struct vstor_packet *vstor_packet;
int ret, t;
+ stor_device = get_out_stor_device(device);
+ if (!stor_device)
+ return -ENODEV;
+
vstor_packet = &request->vstor_packet;
init_completion(&request->wait_event);
@@ -826,7 +830,7 @@ static int storvsc_execute_vstor_op(struct hv_device *device,
ret = vmbus_sendpacket(device->channel, vstor_packet,
(sizeof(struct vstor_packet) -
- vmscsi_size_delta),
+ stor_device->vmscsi_size_delta),
(unsigned long)request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
@@ -903,7 +907,7 @@ static int storvsc_channel_init(struct hv_device *device, bool is_fc)
sense_buffer_size =
vmstor_protocols[i].sense_buffer_size;
- vmscsi_size_delta =
+ stor_device->vmscsi_size_delta =
vmstor_protocols[i].vmscsi_size_delta;
break;
@@ -1249,7 +1253,7 @@ static void storvsc_on_channel_callback(void *context)
if (request == &stor_device->init_request ||
request == &stor_device->reset_request) {
memcpy(&request->vstor_packet, packet,
- (sizeof(struct vstor_packet) - vmscsi_size_delta));
+ (sizeof(struct vstor_packet) - stor_device->vmscsi_size_delta));
complete(&request->wait_event);
} else {
storvsc_on_receive(stor_device, packet, request);
@@ -1461,7 +1465,7 @@ static int storvsc_do_io(struct hv_device *device,
vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
- vmscsi_size_delta);
+ stor_device->vmscsi_size_delta);
vstor_packet->vm_srb.sense_info_length = sense_buffer_size;
@@ -1478,12 +1482,12 @@ static int storvsc_do_io(struct hv_device *device,
request->payload, request->payload_sz,
vstor_packet,
(sizeof(struct vstor_packet) -
- vmscsi_size_delta),
+ stor_device->vmscsi_size_delta),
(unsigned long)request);
} else {
ret = vmbus_sendpacket(outgoing_channel, vstor_packet,
(sizeof(struct vstor_packet) -
- vmscsi_size_delta),
+ stor_device->vmscsi_size_delta),
(unsigned long)request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
@@ -1589,7 +1593,7 @@ static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
ret = vmbus_sendpacket(device->channel, vstor_packet,
(sizeof(struct vstor_packet) -
- vmscsi_size_delta),
+ stor_device->vmscsi_size_delta),
(unsigned long)&stor_device->reset_request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
@@ -1939,6 +1943,7 @@ static int storvsc_probe(struct hv_device *device,
init_waitqueue_head(&stor_device->waiting_to_drain);
stor_device->device = device;
stor_device->host = host;
+ stor_device->vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
spin_lock_init(&stor_device->lock);
hv_set_drvdata(device, stor_device);
--
2.25.1
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