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Commit 66311274691ec65972cad3626057fa8d00c146d8

Authored by Lin Ming
Committed by Jens Axboe
1 parent a937536b86
Exists in smarc-l5.0.0_1.0.0-ga and in 5 other branches imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga

block: add a flag to identify PM request 

Add a flag REQ_PM to identify the request is PM related, such requests
will not change the device request queue's runtime status. It is
intended to be used in driver's runtime PM callback, so that driver can
perform some IO to the device there with the queue's runtime status
unaffected. e.g. in SCSI disk's runtime suspend callback, the disk will
be put into stopped power state, and this require sending a command to
the device. Such command processing should not change the disk's runtime
status.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Showing 1 changed file with 2 additions and 0 deletions Side-by-side Diff

include/linux/blk_types.h
Diff comments   View file @ 6631127
... ... @@ -175,6 +175,7 @@
175 175 __REQ_IO_STAT, /* account I/O stat */
176 176 __REQ_MIXED_MERGE, /* merge of different types, fail separately */
177 177 __REQ_KERNEL, /* direct IO to kernel pages */
  178 + __REQ_PM, /* runtime pm request */
178 179 __REQ_NR_BITS, /* stops here */
179 180 };
180 181  
... ... @@ -223,6 +224,7 @@
223 224 #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
224 225 #define REQ_SECURE (1 << __REQ_SECURE)
225 226 #define REQ_KERNEL (1 << __REQ_KERNEL)
  227 +#define REQ_PM (1 << __REQ_PM)
226 228  
227 229 #endif /* __LINUX_BLK_TYPES_H */