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Commit 79745f98 authored by Subhash Jadavani's avatar Subhash Jadavani Committed by Asutosh Das
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mmc: queue: scale down the max_segs if memory allocation fails 



In low memory conditions at runtime, allocation of max_segs may
fail. Retry with a scaled down max_segs until allocation succeeds.

CRs-fixed: 583267
Change-Id: I072724afa44854dacc58654e6329531c1bb11120
Signed-off-by: default avatarSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: default avatarAsutosh Das <asutoshd@codeaurora.org>
parent 4a149ed1

drivers/mmc/card/queue.c

+25 −4
Original line number Diff line number Diff line
@@ -333,22 +333,43 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, 
#endif



	if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) {

		unsigned int max_segs = host->max_segs;



		blk_queue_bounce_limit(mq->queue, limit);

		blk_queue_max_hw_sectors(mq->queue,

			min(host->max_blk_count, host->max_req_size / 512));

		blk_queue_max_segments(mq->queue, host->max_segs);

		blk_queue_max_segment_size(mq->queue, host->max_seg_size);

retry:

		blk_queue_max_segments(mq->queue, host->max_segs);



		mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret);

		if (ret)

		if (ret == -ENOMEM)

			goto cur_sg_alloc_failed;

		else if (ret)

			goto cleanup_queue;





		mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret);

		if (ret)

		if (ret == -ENOMEM)

			goto prev_sg_alloc_failed;

		else if (ret)

			goto cleanup_queue;



		goto success;



prev_sg_alloc_failed:

		kfree(mqrq_cur->sg);

		mqrq_cur->sg = NULL;

cur_sg_alloc_failed:

		host->max_segs /= 2;

		if (host->max_segs) {

			goto retry;

		} else {

			host->max_segs = max_segs;

			goto cleanup_queue;

		}

	}



success:

	sema_init(&mq->thread_sem, 1);



	mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",