From 1d2c82001a5f528d474dc29a7b1f35ff367f86db Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 6 Apr 2021 08:16:48 +0200 Subject: [PATCH] gdrom: support highmem The gdrom driver only has a single reference to the virtual address of the bio data, and uses that only to get the physical address. Switch to deriving the physical address from the page directly and thus avoid bounce buffering highmem data. Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20210406061648.811275-1-hch@lst.de Signed-off-by: Jens Axboe --- drivers/cdrom/gdrom.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c index 9874fc1c815b..e7717d090868 100644 --- a/drivers/cdrom/gdrom.c +++ b/drivers/cdrom/gdrom.c @@ -583,7 +583,8 @@ static blk_status_t gdrom_readdisk_dma(struct request *req) read_command->cmd[1] = 0x20; block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET; block_cnt = blk_rq_sectors(req)/GD_TO_BLK; - __raw_writel(virt_to_phys(bio_data(req->bio)), GDROM_DMA_STARTADDR_REG); + __raw_writel(page_to_phys(bio_page(req->bio)) + bio_offset(rq->bio), + GDROM_DMA_STARTADDR_REG); __raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG); __raw_writel(1, GDROM_DMA_DIRECTION_REG); __raw_writel(1, GDROM_DMA_ENABLE_REG); @@ -789,8 +790,6 @@ static int probe_gdrom(struct platform_device *devptr) goto probe_fail_requestq; } - blk_queue_bounce_limit(gd.gdrom_rq, BLK_BOUNCE_HIGH); - err = probe_gdrom_setupqueue(); if (err) goto probe_fail_toc;