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Commit 184d2944 authored by Matthew Wilcox's avatar Matthew Wilcox
Browse files

NVMe: Add a few calling convention notes 



For the benefit of reviewers, add comments to a few functions describing
their calling context

Signed-off-by: default avatarMatthew Wilcox <matthew.r.wilcox@intel.com>
parent b77954cb

drivers/block/nvme.c

+10 −1
Original line number Diff line number Diff line
@@ -155,6 +155,9 @@ static struct nvme_cmd_info *nvme_cmd_info(struct nvme_queue *nvmeq) 
 * the bottom two bits of the ctx pointer to store the handler ID.

 * Passing in a pointer that's not 4-byte aligned will cause a BUG.

 * We can change this if it becomes a problem.

 *

 * May be called with local interrupts disabled and the q_lock held,

 * or with interrupts enabled and no locks held.

 */

static int alloc_cmdid(struct nvme_queue *nvmeq, void *ctx, int handler,

							unsigned timeout)
@@ -202,6 +205,9 @@ enum { 
#define CMD_CTX_INVALID		(0x314 + CMD_CTX_BASE)

#define CMD_CTX_FLUSH		(0x318 + CMD_CTX_BASE)



/*

 * Called with local interrupts disabled and the q_lock held.  May not sleep.

 */

static unsigned long free_cmdid(struct nvme_queue *nvmeq, int cmdid)

{

	unsigned long data;
@@ -326,7 +332,7 @@ static void bio_completion(struct nvme_queue *nvmeq, void *ctx, 
	}

}



/* length is in bytes */

/* length is in bytes.  gfp flags indicates whether we may sleep. */

static struct nvme_prps *nvme_setup_prps(struct nvme_dev *dev,

					struct nvme_common_command *cmd,

					struct scatterlist *sg, int *len,
@@ -483,6 +489,9 @@ static int nvme_submit_flush_data(struct nvme_queue *nvmeq, struct nvme_ns *ns) 
	return nvme_submit_flush(nvmeq, ns, cmdid);

}



/*

 * Called with local interrupts disabled and the q_lock held.  May not sleep.

 */

static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,

								struct bio *bio)

{