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Message-Id: <1341547472-6863-2-git-send-email-ming.m.lin@intel.com>
Date: Fri, 6 Jul 2012 12:04:29 +0800
From: Lin Ming <ming.m.lin@...el.com>
To: Jens Axboe <axboe@...nel.dk>,
Alan Stern <stern@...land.harvard.edu>,
"Rafael J. Wysocki" <rjw@...k.pl>, Shaohua Li <shli@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
linux-scsi@...r.kernel.org
Subject: [PATCH v5 1/4] block: add a flag to identify PM request
Add a flag REQ_PM to identify the request is PM related.
As an example, modify scsi code to use this flag.
Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
drivers/scsi/scsi_lib.c | 9 ++++-----
drivers/scsi/sd.c | 9 +++++----
include/linux/blk_types.h | 2 ++
include/scsi/scsi_device.h | 17 +++++++++++++----
4 files changed, 24 insertions(+), 13 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 6dfb978..98be3f1 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -255,11 +255,10 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
}
EXPORT_SYMBOL(scsi_execute);
-
-int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
+int scsi_execute_req_flags(struct scsi_device *sdev, const unsigned char *cmd,
int data_direction, void *buffer, unsigned bufflen,
struct scsi_sense_hdr *sshdr, int timeout, int retries,
- int *resid)
+ int *resid, int flags)
{
char *sense = NULL;
int result;
@@ -270,14 +269,14 @@ int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
return DRIVER_ERROR << 24;
}
result = scsi_execute(sdev, cmd, data_direction, buffer, bufflen,
- sense, timeout, retries, 0, resid);
+ sense, timeout, retries, flags, resid);
if (sshdr)
scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, sshdr);
kfree(sense);
return result;
}
-EXPORT_SYMBOL(scsi_execute_req);
+EXPORT_SYMBOL(scsi_execute_req_flags);
/*
* Function: scsi_init_cmd_errh()
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 6f72b80..ce03a0a 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1270,8 +1270,9 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
* Leave the rest of the command zero to indicate
* flush everything.
*/
- res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
- SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
+ res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
+ SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL,
+ REQ_PM);
if (res == 0)
break;
}
@@ -2815,8 +2816,8 @@ static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
if (!scsi_device_online(sdp))
return -ENODEV;
- res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
- SD_TIMEOUT, SD_MAX_RETRIES, NULL);
+ res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
+ SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
if (res) {
sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
sd_print_result(sdkp, res);
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 0edb65d..ed53dca 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -160,6 +160,7 @@ enum rq_flag_bits {
__REQ_FLUSH_SEQ, /* request for flush sequence */
__REQ_IO_STAT, /* account I/O stat */
__REQ_MIXED_MERGE, /* merge of different types, fail separately */
+ __REQ_PM, /* runtime pm request */
__REQ_NR_BITS, /* stops here */
};
@@ -201,5 +202,6 @@ enum rq_flag_bits {
#define REQ_IO_STAT (1 << __REQ_IO_STAT)
#define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
#define REQ_SECURE (1 << __REQ_SECURE)
+#define REQ_PM (1 << __REQ_PM)
#endif /* __LINUX_BLK_TYPES_H */
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index ba96988..ea6a97f 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -384,10 +384,19 @@ extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
int data_direction, void *buffer, unsigned bufflen,
unsigned char *sense, int timeout, int retries,
int flag, int *resid);
-extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
- int data_direction, void *buffer, unsigned bufflen,
- struct scsi_sense_hdr *, int timeout, int retries,
- int *resid);
+extern int scsi_execute_req_flags(struct scsi_device *sdev,
+ const unsigned char *cmd, int data_direction, void *buffer,
+ unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
+ int retries, int *resid, int flags);
+
+static inline int scsi_execute_req(struct scsi_device *sdev,
+ const unsigned char *cmd, int data_direction, void *buffer,
+ unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
+ int retries, int *resid)
+{
+ return scsi_execute_req_flags(sdev, cmd, data_direction, buffer,
+ bufflen, sshdr, timeout, retries, resid, 0);
+}
#ifdef CONFIG_PM_RUNTIME
extern int scsi_autopm_get_device(struct scsi_device *);
--
1.7.10
--
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